glutamate receptor 2.6 [Arabidopsis thaliana]
Protein Classification
glutamate receptor( domain architecture ID 14448285)
glutamate receptor is a glutamate-gated receptor that probably acts as a non-selective cation channel and may be involved in light-signal transduction and calcium homeostasis via the regulation of calcium influx into cells
List of domain hits
| Name | Accession | Description | Interval | E-value | ||||||
| PBP1_GABAb_receptor_plant | cd19990 | periplasmic ligand-binding domain of Arabidopsis thaliana glutamate receptors and its close ... |
38-421 | 1.06e-167 | ||||||
periplasmic ligand-binding domain of Arabidopsis thaliana glutamate receptors and its close homologs in other plants; This group includes the ligand-binding domain of Arabidopsis thaliana glutamate receptors, which have sequence similarity with animal ionotropic glutamate receptor and its close homologs in other plants. The ligand-binding domain of GABAb receptors are metabotropic transmembrane receptors for gamma-aminobutyric acid (GABA). GABA is the major inhibitory neurotransmitter in the mammalian CNS and, like glutamate and other transmitters, acts via both ligand gated ion channels (GABAa receptors) and G-protein coupled receptors (GABAb receptor or GABAbR). GABAa receptors are members of the ionotropic receptor superfamily which includes alpha-adrenergic and glycine receptors. The GABAb receptor is a member of a receptor superfamily which includes the mGlu receptors. The GABAb receptor is coupled to G alpha-i proteins, and activation causes a decrease in calcium, an increase in potassium membrane conductance, and inhibition of cAMP formation. The response is thus inhibitory and leads to hyperpolarization and decreased neurotransmitter release, for example. : Pssm-ID: 380645 [Multi-domain] Cd Length: 373 Bit Score: 492.51 E-value: 1.06e-167
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| GluR_Plant | cd13686 | Plant glutamate receptor domain; the type 2 periplasmic binding protein fold; This subfamily ... |
460-749 | 2.99e-124 | ||||||
Plant glutamate receptor domain; the type 2 periplasmic binding protein fold; This subfamily contains the glutamate receptor domain GluR. These domains are found in the GluR proteins that have been shown to function as L-glutamate activated potassium channels, also known ionotropic glutamate receptors or iGluRs. In addition to two ligand binding core domains, iGluRs typically have a channel-like domain inserted in the middle of the GluR-like domain. Animal iGluRs mediate the ion flux in the synapses of the CNS and can be subdivided into several classes depending on the neurotransmitter specificity and ion conductance properties. Their plant homologs have been shown to function in light signal transduction and calcium homeostasis. The GluR proteins belong to the PBP2 superfamily of periplasmic binding proteins that differ in size and ligand specificity, but have similar tertiary structures consisting of two globular subdomains connected by a flexible hinge. They have been shown to bind their ligand in the cleft between these domains in a manner resembling a Venus flytrap. : Pssm-ID: 270404 [Multi-domain] Cd Length: 232 Bit Score: 374.93 E-value: 2.99e-124
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| Name | Accession | Description | Interval | E-value | ||||||
| PBP1_GABAb_receptor_plant | cd19990 | periplasmic ligand-binding domain of Arabidopsis thaliana glutamate receptors and its close ... |
38-421 | 1.06e-167 | ||||||
periplasmic ligand-binding domain of Arabidopsis thaliana glutamate receptors and its close homologs in other plants; This group includes the ligand-binding domain of Arabidopsis thaliana glutamate receptors, which have sequence similarity with animal ionotropic glutamate receptor and its close homologs in other plants. The ligand-binding domain of GABAb receptors are metabotropic transmembrane receptors for gamma-aminobutyric acid (GABA). GABA is the major inhibitory neurotransmitter in the mammalian CNS and, like glutamate and other transmitters, acts via both ligand gated ion channels (GABAa receptors) and G-protein coupled receptors (GABAb receptor or GABAbR). GABAa receptors are members of the ionotropic receptor superfamily which includes alpha-adrenergic and glycine receptors. The GABAb receptor is a member of a receptor superfamily which includes the mGlu receptors. The GABAb receptor is coupled to G alpha-i proteins, and activation causes a decrease in calcium, an increase in potassium membrane conductance, and inhibition of cAMP formation. The response is thus inhibitory and leads to hyperpolarization and decreased neurotransmitter release, for example. Pssm-ID: 380645 [Multi-domain] Cd Length: 373 Bit Score: 492.51 E-value: 1.06e-167
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| GluR_Plant | cd13686 | Plant glutamate receptor domain; the type 2 periplasmic binding protein fold; This subfamily ... |
460-749 | 2.99e-124 | ||||||
Plant glutamate receptor domain; the type 2 periplasmic binding protein fold; This subfamily contains the glutamate receptor domain GluR. These domains are found in the GluR proteins that have been shown to function as L-glutamate activated potassium channels, also known ionotropic glutamate receptors or iGluRs. In addition to two ligand binding core domains, iGluRs typically have a channel-like domain inserted in the middle of the GluR-like domain. Animal iGluRs mediate the ion flux in the synapses of the CNS and can be subdivided into several classes depending on the neurotransmitter specificity and ion conductance properties. Their plant homologs have been shown to function in light signal transduction and calcium homeostasis. The GluR proteins belong to the PBP2 superfamily of periplasmic binding proteins that differ in size and ligand specificity, but have similar tertiary structures consisting of two globular subdomains connected by a flexible hinge. They have been shown to bind their ligand in the cleft between these domains in a manner resembling a Venus flytrap. Pssm-ID: 270404 [Multi-domain] Cd Length: 232 Bit Score: 374.93 E-value: 2.99e-124
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| ANF_receptor | pfam01094 | Receptor family ligand binding region; This family includes extracellular ligand binding ... |
55-400 | 8.98e-78 | ||||||
Receptor family ligand binding region; This family includes extracellular ligand binding domains of a wide range of receptors. This family also includes the bacterial amino acid binding proteins of known structure. Pssm-ID: 460062 [Multi-domain] Cd Length: 347 Bit Score: 256.93 E-value: 8.98e-78
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| Lig_chan | pfam00060 | Ligand-gated ion channel; This family includes the four transmembrane regions of the ... |
591-781 | 4.29e-26 | ||||||
Ligand-gated ion channel; This family includes the four transmembrane regions of the ionotropic glutamate receptors and NMDA receptors. Pssm-ID: 459656 [Multi-domain] Cd Length: 267 Bit Score: 108.55 E-value: 4.29e-26
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| PBPe | smart00079 | Eukaryotic homologues of bacterial periplasmic substrate binding proteins; Prokaryotic ... |
623-749 | 6.09e-25 | ||||||
Eukaryotic homologues of bacterial periplasmic substrate binding proteins; Prokaryotic homologues are represented by a separate alignment: PBPb Pssm-ID: 197504 [Multi-domain] Cd Length: 133 Bit Score: 100.83 E-value: 6.09e-25
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| LivK | COG0683 | ABC-type branched-chain amino acid transport system, periplasmic component [Amino acid ... |
36-408 | 2.22e-21 | ||||||
ABC-type branched-chain amino acid transport system, periplasmic component [Amino acid transport and metabolism]; Pssm-ID: 440447 [Multi-domain] Cd Length: 314 Bit Score: 95.77 E-value: 2.22e-21
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| HisJ | COG0834 | ABC-type amino acid transport/signal transduction system, periplasmic component/domain [Amino ... |
488-752 | 1.34e-17 | ||||||
ABC-type amino acid transport/signal transduction system, periplasmic component/domain [Amino acid transport and metabolism, Signal transduction mechanisms]; Pssm-ID: 440596 [Multi-domain] Cd Length: 223 Bit Score: 82.72 E-value: 1.34e-17
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| Name | Accession | Description | Interval | E-value | |||||||
| PBP1_GABAb_receptor_plant | cd19990 | periplasmic ligand-binding domain of Arabidopsis thaliana glutamate receptors and its close ... |
38-421 | 1.06e-167 | |||||||
periplasmic ligand-binding domain of Arabidopsis thaliana glutamate receptors and its close homologs in other plants; This group includes the ligand-binding domain of Arabidopsis thaliana glutamate receptors, which have sequence similarity with animal ionotropic glutamate receptor and its close homologs in other plants. The ligand-binding domain of GABAb receptors are metabotropic transmembrane receptors for gamma-aminobutyric acid (GABA). GABA is the major inhibitory neurotransmitter in the mammalian CNS and, like glutamate and other transmitters, acts via both ligand gated ion channels (GABAa receptors) and G-protein coupled receptors (GABAb receptor or GABAbR). GABAa receptors are members of the ionotropic receptor superfamily which includes alpha-adrenergic and glycine receptors. The GABAb receptor is a member of a receptor superfamily which includes the mGlu receptors. The GABAb receptor is coupled to G alpha-i proteins, and activation causes a decrease in calcium, an increase in potassium membrane conductance, and inhibition of cAMP formation. The response is thus inhibitory and leads to hyperpolarization and decreased neurotransmitter release, for example. Pssm-ID: 380645 [Multi-domain] Cd Length: 373 Bit Score: 492.51 E-value: 1.06e-167
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| GluR_Plant | cd13686 | Plant glutamate receptor domain; the type 2 periplasmic binding protein fold; This subfamily ... |
460-749 | 2.99e-124 | |||||||
Plant glutamate receptor domain; the type 2 periplasmic binding protein fold; This subfamily contains the glutamate receptor domain GluR. These domains are found in the GluR proteins that have been shown to function as L-glutamate activated potassium channels, also known ionotropic glutamate receptors or iGluRs. In addition to two ligand binding core domains, iGluRs typically have a channel-like domain inserted in the middle of the GluR-like domain. Animal iGluRs mediate the ion flux in the synapses of the CNS and can be subdivided into several classes depending on the neurotransmitter specificity and ion conductance properties. Their plant homologs have been shown to function in light signal transduction and calcium homeostasis. The GluR proteins belong to the PBP2 superfamily of periplasmic binding proteins that differ in size and ligand specificity, but have similar tertiary structures consisting of two globular subdomains connected by a flexible hinge. They have been shown to bind their ligand in the cleft between these domains in a manner resembling a Venus flytrap. Pssm-ID: 270404 [Multi-domain] Cd Length: 232 Bit Score: 374.93 E-value: 2.99e-124
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| PBP1_glutamate_receptors-like | cd06269 | ligand-binding domain of family C G-protein couples receptors (GPCRs), membrane bound guanylyl ... |
38-326 | 8.31e-92 | |||||||
ligand-binding domain of family C G-protein couples receptors (GPCRs), membrane bound guanylyl cyclases such as natriuretic peptide receptors (NPRs), and N-terminal leucine/isoleucine/valine-binding protein (LIVBP)-like domain of ionotropic glutamate rece; This CD represents the ligand-binding domain of the family C G-protein couples receptors (GPCRs), membrane bound guanylyl cyclases such as the family of natriuretic peptide receptors (NPRs), and the N-terminal leucine-isoleucine-valine binding protein (LIVBP)-like domain of the ionotropic glutamate receptors, all of which are structurally similar and related to the periplasmic-binding fold type 1 family. The family C GPCRs consists of metabotropic glutamate receptor (mGluR), a calcium-sensing receptor (CaSR), gamma-aminobutyric acid receptor (GABAbR), the promiscuous L-alpha-amino acid receptor GPR6A, families of taste and pheromone receptors, and orphan receptors. Truncated splicing variants of the orphan receptors are not included in this CD. The family C GPCRs are activated by endogenous agonists such as amino acids, ions, and sugar based molecules. Their amino terminal ligand-binding region is homologous to the bacterial leucine-isoleucine-valine binding protein (LIVBP) and a leucine binding protein (LBP). The ionotropic glutamate receptors (iGluRs) have an integral ion channel and are subdivided into three major groups based on their pharmacology and structural similarities: NMDA receptors, AMPA receptors, and kainate receptors. The family of membrane bound guanylyl cyclases is further divided into three subfamilies: the ANP receptor (GC-A)/C-type natriuretic peptide receptor (GC-B), the heat-stable enterotoxin receptor (GC-C)/sensory organ specific membrane GCs such as retinal receptors (GC-E, GC-F), and olfactory receptors (GC-D and GC-G). Pssm-ID: 380493 [Multi-domain] Cd Length: 332 Bit Score: 293.94 E-value: 8.31e-92
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| ANF_receptor | pfam01094 | Receptor family ligand binding region; This family includes extracellular ligand binding ... |
55-400 | 8.98e-78 | |||||||
Receptor family ligand binding region; This family includes extracellular ligand binding domains of a wide range of receptors. This family also includes the bacterial amino acid binding proteins of known structure. Pssm-ID: 460062 [Multi-domain] Cd Length: 347 Bit Score: 256.93 E-value: 8.98e-78
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| PBP2_iGluR_ligand_binding | cd00998 | The ligand-binding domain of ionotropic glutamate receptor family, a member of the periplasmic ... |
460-749 | 1.70e-35 | |||||||
The ligand-binding domain of ionotropic glutamate receptor family, a member of the periplasmic binding protein type II superfamily; This subfamily represents the ligand binding of ionotropic glutamate receptors. iGluRs are heterotetrameric ion channels that comprises of three functionally distinct subtypes based on their pharmacology and structural similarities: AMPA (alpha-amino-3-hydroxyl-5-methyl-4-isoxazolepropionic acid), NMDA (N-methyl-D-aspartate), and kainate receptors. All three types of channels are also activated by the physiological neurotransmitter, glutamate. iGluRs are concentrated at postsynaptic sites, where they exert a variety of different functions. While this ligand-binding domain of iGluRs is structurally homologous to the periplasmic binding fold type II superfamily, the N-terminal leucine/isoleucine/valine-binding protein (LIVBP)-like domain belongs to the periplasmic-binding fold type I. Pssm-ID: 270219 [Multi-domain] Cd Length: 243 Bit Score: 135.19 E-value: 1.70e-35
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| Lig_chan | pfam00060 | Ligand-gated ion channel; This family includes the four transmembrane regions of the ... |
591-781 | 4.29e-26 | |||||||
Ligand-gated ion channel; This family includes the four transmembrane regions of the ionotropic glutamate receptors and NMDA receptors. Pssm-ID: 459656 [Multi-domain] Cd Length: 267 Bit Score: 108.55 E-value: 4.29e-26
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| PBPe | smart00079 | Eukaryotic homologues of bacterial periplasmic substrate binding proteins; Prokaryotic ... |
623-749 | 6.09e-25 | |||||||
Eukaryotic homologues of bacterial periplasmic substrate binding proteins; Prokaryotic homologues are represented by a separate alignment: PBPb Pssm-ID: 197504 [Multi-domain] Cd Length: 133 Bit Score: 100.83 E-value: 6.09e-25
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| LivK | COG0683 | ABC-type branched-chain amino acid transport system, periplasmic component [Amino acid ... |
36-408 | 2.22e-21 | |||||||
ABC-type branched-chain amino acid transport system, periplasmic component [Amino acid transport and metabolism]; Pssm-ID: 440447 [Multi-domain] Cd Length: 314 Bit Score: 95.77 E-value: 2.22e-21
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| PBP1_GPCR_family_C-like | cd06350 | ligand-binding domain of membrane-bound glutamate receptors that mediate excitatory ... |
78-285 | 1.23e-20 | |||||||
ligand-binding domain of membrane-bound glutamate receptors that mediate excitatory transmission on the cellular surface through initial binding of glutamate; categorized into ionotropic glutamate receptors (iGluRs) and metabotropic glutamate receptors (m; Ligand-binding domain of membrane-bound glutamate receptors that mediate excitatory transmission on the cellular surface through initial binding of glutamate and are categorized into ionotropic glutamate receptors (iGluRs) and metabotropic glutamate receptors (mGluRs). The metabotropic glutamate receptors (mGluR) are key receptors in the modulation of excitatory synaptic transmission in the central nervous system. The mGluRs are coupled to G proteins and are thus distinct from the iGluRs which internally contain ligand-gated ion channels. The mGluR structure is divided into three regions: the extracellular region, the seven-spanning transmembrane region and the cytoplasmic region. The extracellular region is further divided into the ligand-binding domain (LBD) and the cysteine-rich domain. The LBD has sequence similarity to the LIVBP, which is a bacterial periplasmic protein (PBP), as well as to the extracellular region of both iGluR and the gamma-aminobutyric acid (GABA)b receptor. iGluRs are divided into three main subtypes based on pharmacological profile: NMDA, AMPA, and kainate receptors. All family C GPCRs have a large extracellular N terminus that contain a domain with homology to bacterial periplasmic amino acid-binding proteins. Pssm-ID: 380573 Cd Length: 350 Bit Score: 94.28 E-value: 1.23e-20
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| HisJ | COG0834 | ABC-type amino acid transport/signal transduction system, periplasmic component/domain [Amino ... |
488-752 | 1.34e-17 | |||||||
ABC-type amino acid transport/signal transduction system, periplasmic component/domain [Amino acid transport and metabolism, Signal transduction mechanisms]; Pssm-ID: 440596 [Multi-domain] Cd Length: 223 Bit Score: 82.72 E-value: 1.34e-17
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| PBP2_iGluR_non_NMDA_like | cd13685 | The ligand-binding domain of non-NMDA (N-methyl-D-aspartate) type ionotropic glutamate ... |
475-748 | 1.14e-16 | |||||||
The ligand-binding domain of non-NMDA (N-methyl-D-aspartate) type ionotropic glutamate receptors, a member of the type 2 periplasmic-binding fold protein superfamily; This subfamily represents the ligand-binding domain of non-NMDA (N-methyl-D-aspartate) type ionotropic glutamate receptors including AMPA (alpha-amino-3-hydroxyl-5-methyl-4-isoxazolepropionic acid) receptors (GluR1-4), kainate receptors (GluR5-7 and KA1/2), and orphan receptors delta 1/2. iGluRs form tetrameric ligand-gated ion channels, which are concentrated at postsynaptic sites in excitatory synapses where they fulfill a variety of different functions. While this ligand-binding domain of iGluRs is structurally homologous to the periplasmic binding fold type II superfamily, the N-terminal leucine/isoleucine/valine#binding protein (LIVBP)-like domain belongs to the periplasmic-binding fold type I. Pssm-ID: 270403 [Multi-domain] Cd Length: 252 Bit Score: 80.69 E-value: 1.14e-16
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| PBP1_mGluR | cd06362 | ligand binding domain of metabotropic glutamate receptors (mGluR); Ligand binding domain of ... |
101-287 | 1.51e-16 | |||||||
ligand binding domain of metabotropic glutamate receptors (mGluR); Ligand binding domain of the metabotropic glutamate receptors (mGluR), which are members of the family C of G-protein-coupled receptors that transduce extracellular signals into G-protein activation and ultimately into cellular responses. mGluRs bind to glutamate and function as an excitatory neurotransmitter; they are involved in learning, memory, anxiety, and the perception of pain. Eight subtypes of mGluRs have been cloned so far, and are classified into three groups according to their sequence similarities, transduction mechanisms, and pharmacological profiles. Group I is composed of mGlu1R and mGlu5R that both stimulate PLC hydrolysis. Group II includes mGlu2R and mGlu3R, which inhibit adenylyl cyclase, as do mGlu4R, mGlu6R, mGlu7R, and mGlu8R, which form group III. Pssm-ID: 380585 [Multi-domain] Cd Length: 460 Bit Score: 83.50 E-value: 1.51e-16
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| PBP1_ABC_ligand_binding-like | cd06346 | type 1 periplasmic ligand-binding domain of uncharacterized ABC (Atpase Binding Cassette)-type ... |
38-337 | 1.78e-16 | |||||||
type 1 periplasmic ligand-binding domain of uncharacterized ABC (Atpase Binding Cassette)-type active transport systems predicted to be involved in uptake of amino acids, peptides, or inorganic ions; This subgroup includes the type 1 periplasmic ligand-binding domain of uncharacterized ABC (Atpase Binding Cassette)-type active transport systems that are predicted to be involved in uptake of amino acids, peptides, or inorganic ions. This subgroup has high sequence similarity to members of the family of hydrophobic amino acid transporters (HAAT), such as leucine-isoleucine-valine binding protein (LIVBP); however, its ligand specificity has not been determined experimentally. Pssm-ID: 380569 [Multi-domain] Cd Length: 314 Bit Score: 81.46 E-value: 1.78e-16
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| PBP1_GABAb_receptor | cd06366 | ligand-binding domain of GABAb receptors, which are metabotropic transmembrane receptors for ... |
49-444 | 8.01e-16 | |||||||
ligand-binding domain of GABAb receptors, which are metabotropic transmembrane receptors for gamma-aminobutyric acid (GABA); Ligand-binding domain of GABAb receptors, which are metabotropic transmembrane receptors for gamma-aminobutyric acid (GABA). GABA is the major inhibitory neurotransmitter in the mammalian CNS and, like glutamate and other transmitters, acts via both ligand gated ion channels (GABAa receptors) and G-protein coupled receptors (GABAb receptor or GABAbR). GABAa receptors are members of the ionotropic receptor superfamily which includes alpha-adrenergic and glycine receptors. The GABAb receptor is a member of a receptor superfamily which includes the mGlu receptors. The GABAb receptor is coupled to G alpha-i proteins, and activation causes a decrease in calcium, an increase in potassium membrane conductance, and inhibition of cAMP formation. The response is thus inhibitory and leads to hyperpolarization and decreased neurotransmitter release, for example. Pssm-ID: 380589 [Multi-domain] Cd Length: 404 Bit Score: 80.75 E-value: 8.01e-16
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| PBP2_peptides_like | cd13530 | Peptide-binding protein and related homologs; type 2 periplasmic binding protein fold; This ... |
488-748 | 1.08e-15 | |||||||
Peptide-binding protein and related homologs; type 2 periplasmic binding protein fold; This domain is found in solute binding proteins that serve as initial receptors in the ABC transport, signal transduction and channel gating. The PBP2 proteins share the same architecture as periplasmic binding proteins type 1, but have a different topology. They are typically comprised of two globular subdomains connected by a flexible hinge and bind their ligand in the cleft between these domains in a manner resembling a Venus flytrap. The majority of PBP2 proteins function in the uptake of small soluble substrates in eubacteria and archaea. After binding their specific ligand with high affinity, they can interact with a cognate membrane transport complex comprised of two integral membrane domains and two cytoplasmically-located ATPase domains. This interaction triggers the ligand translocation across the cytoplasmic membrane energized by ATP hydrolysis. Besides transport proteins, the family includes ionotropic glutamate receptors and unorthodox sensor proteins involved in signal transduction. Pssm-ID: 270248 [Multi-domain] Cd Length: 217 Bit Score: 76.91 E-value: 1.08e-15
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| PBP2_iGluR_putative | cd13717 | The ligand-binding domain of putative ionotropic glutamate receptors, a member of the type 2 ... |
483-748 | 2.37e-15 | |||||||
The ligand-binding domain of putative ionotropic glutamate receptors, a member of the type 2 periplasmic binding fold protein superfamily; This group contains glutamate receptor domain GluR. These domains are found in the GluR proteins that have been shown to function as L-glutamate activated potassium channels, also known ionotropic glutamate receptors or iGluRs. In addition to two ligand binding core domains, iGluRs typically have a channel-like domain inserted in the middle of the GluR-like domain. Animal iGluRs mediate the ion flux in the synapses of the CNS and can be subdivided into several classes depending on the neurotransmitter specificity and ion conductance properties. Their plant homologs have been shown to function in light signal transduction and calcium homeostasis. The GluR proteins belong to the PBPII superfamily of periplasmic binding proteins that differ in size and ligand specificity, but have similar tertiary structures consisting of two globular subdomains connected by a flexible hinge. They have been shown to bind their ligand in the cleft between these domains in a manner resembling a Venus flytrap. Pssm-ID: 270435 [Multi-domain] Cd Length: 360 Bit Score: 78.49 E-value: 2.37e-15
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| PBP1_NPR_GC-like | cd06352 | ligand-binding domain of membrane guanylyl-cyclase receptors; Ligand-binding domain of ... |
37-258 | 3.12e-15 | |||||||
ligand-binding domain of membrane guanylyl-cyclase receptors; Ligand-binding domain of membrane guanylyl-cyclase receptors. Membrane guanylyl cyclases (GC) have a single membrane-spanning region and are activated by endogenous and exogenous peptides. This family can be divided into three major subfamilies: the natriuretic peptide receptors (NPRs), sensory organ-specific membrane GCs, and the enterotoxin/guanylin receptors. The binding of peptide ligands to the receptor results in the activation of the cytosolic catalytic domain. Three types of NPRs have been cloned from mammalian tissues: NPR-A/GC-A, NPR-B/ GC-B, and NPR-C. In addition, two of the GCs, GC-D and GC-G, appear to be pseudogenes in humans. Atrial natriuretic peptide (ANP) and brain natriuretic peptide (BNP) are produced in the heart, and both bind to the NPR-A. NPR-C, also termed the clearance receptor, binds each of the natriuretic peptides and can alter circulating levels of these peptides. The ligand binding domain of the NPRs exhibits strong structural similarity to the type 1 periplasmic binding fold protein family. Pssm-ID: 380575 [Multi-domain] Cd Length: 391 Bit Score: 78.55 E-value: 3.12e-15
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| PBP1_ABC_transporter_LIVBP-like | cd06268 | periplasmic binding domain of ATP-binding cassette transporter-like systems that belong to the ... |
38-325 | 3.16e-15 | |||||||
periplasmic binding domain of ATP-binding cassette transporter-like systems that belong to the type 1 periplasmic binding fold protein superfamily; Periplasmic binding domain of ATP-binding cassette transporter-like systems that belong to the type 1 periplasmic binding fold protein superfamily. They are mostly present in archaea and eubacteria, and are primarily involved in scavenging solutes from the environment. ABC-type transporters couple ATP hydrolysis with the uptake and efflux of a wide range of substrates across bacterial membranes, including amino acids, peptides, lipids and sterols, and various drugs. These systems are comprised of transmembrane domains, nucleotide binding domains, and in most bacterial uptake systems, periplasmic binding proteins (PBPs) which transfer the ligand to the extracellular gate of the transmembrane domains. These PBPs bind their substrates selectively and with high affinity. Members of this group include ABC-type Leucine-Isoleucine-Valine-Binding Proteins (LIVBP), which are homologous to the aliphatic amidase transcriptional repressor, AmiC, of Pseudomonas aeruginosa. The uncharacterized periplasmic components of various ABC-type transport systems are included in this group. Pssm-ID: 380492 [Multi-domain] Cd Length: 298 Bit Score: 77.37 E-value: 3.16e-15
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| PBP1_ABC_ligand_binding-like | cd19984 | type 1 periplasmic ligand-binding domain of uncharacterized ABC (Atpase Binding Cassette)-type ... |
46-325 | 1.03e-14 | |||||||
type 1 periplasmic ligand-binding domain of uncharacterized ABC (Atpase Binding Cassette)-type active transport systems predicted to be involved in uptake of amino acids, peptides, or inorganic ions; This subgroup includes the type 1 periplasmic ligand-binding domain of uncharacterized ABC (Atpase Binding Cassette)-type active transport systems that are predicted to be involved in uptake of amino acids, peptides, or inorganic ions. This subgroup has high sequence similarity to members of the family of hydrophobic amino acid transporters (HAAT), such as leucine-isoleucine-valine binding protein (LIVBP); however, its ligand specificity has not been determined experimentally. Pssm-ID: 380639 [Multi-domain] Cd Length: 296 Bit Score: 75.72 E-value: 1.03e-14
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| SBP_bac_3 | pfam00497 | Bacterial extracellular solute-binding proteins, family 3; This is a sensor domain found in ... |
507-749 | 9.04e-14 | |||||||
Bacterial extracellular solute-binding proteins, family 3; This is a sensor domain found in solute-binding protein family 3 members from Gram-positive bacteria, Gram-negative bacteria and archaea. It can also be found in the N-terminal of the membrane-bound lytic murein transglycosylase F (MltF) protein. This domain recognizes Nicotinate, quidalnate, pyridine-2,5-dicarboxylate and salicylate (Matilla et. al., FEMS Microbiology Reviews, fuab043, 45, 2021, 1. https://doi.org/10.1093/femsre/fuab043). Pssm-ID: 425719 [Multi-domain] Cd Length: 221 Bit Score: 71.55 E-value: 9.04e-14
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| PBP1_taste_receptor | cd06363 | ligand-binding domain of the T1R taste receptor; Ligand-binding domain of the T1R taste ... |
94-284 | 9.13e-13 | |||||||
ligand-binding domain of the T1R taste receptor; Ligand-binding domain of the T1R taste receptor. The T1R is a member of the family C receptors within the G-protein coupled receptor superfamily, which also includes the metabotropic glutamate receptors, GABAb receptors, the calcium-sensing receptor (CaSR), the V2R pheromone receptors, and a small group of uncharacterized orphan receptors. Pssm-ID: 380586 [Multi-domain] Cd Length: 418 Bit Score: 71.18 E-value: 9.13e-13
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| PBP1_ABC_LivK_ligand_binding-like | cd06347 | type 1 periplasmic ligand-binding domain of uncharacterized ABC (Atpase Binding Cassette)-type ... |
38-383 | 1.58e-12 | |||||||
type 1 periplasmic ligand-binding domain of uncharacterized ABC (Atpase Binding Cassette)-type active transport systems predicted to be involved in uptake of amino acids, peptides, or inorganic ions; This subgroup includes the type 1 periplasmic ligand-binding domain of uncharacterized ABC (Atpase Binding Cassette)-type active transport systems that are predicted to be involved in uptake of amino acids, peptides, or inorganic ions. This subgroup has high sequence similarity to members of the family of hydrophobic amino acid transporters (HAAT), such as leucine-isoleucine-valine binding protein (LIVBP); however, its ligand specificity has not been determined experimentally. Pssm-ID: 380570 [Multi-domain] Cd Length: 334 Bit Score: 69.88 E-value: 1.58e-12
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| PBPb | smart00062 | Bacterial periplasmic substrate-binding proteins; bacterial proteins, eukaryotic ones are in ... |
461-749 | 1.55e-11 | |||||||
Bacterial periplasmic substrate-binding proteins; bacterial proteins, eukaryotic ones are in PBPe Pssm-ID: 214497 [Multi-domain] Cd Length: 219 Bit Score: 65.04 E-value: 1.55e-11
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| Peripla_BP_6 | pfam13458 | Periplasmic binding protein; This family includes a diverse range of periplasmic binding ... |
35-385 | 1.77e-11 | |||||||
Periplasmic binding protein; This family includes a diverse range of periplasmic binding proteins. Pssm-ID: 433225 [Multi-domain] Cd Length: 342 Bit Score: 66.53 E-value: 1.77e-11
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| PBP1_ABC_HAAT-like | cd19988 | type 1 periplasmic ligand-binding domain of uncharacterized ABC (Atpase Binding Cassette)-type ... |
53-325 | 9.61e-11 | |||||||
type 1 periplasmic ligand-binding domain of uncharacterized ABC (Atpase Binding Cassette)-type active transport systems predicted to be involved in uptake of amino acids or peptides; This subgroup includes the type 1 periplasmic ligand-binding domain of uncharacterized ABC (Atpase Binding Cassette)-type active transport systems that are predicted to be involved in the uptake of amino acids or peptides. This subgroup has high sequence similarity to members of the family of hydrophobic amino acid transporters (HAAT), such as leucine-isoleucine-valine binding protein (LIVBP); however, its ligand specificity has not been determined experimentally. Pssm-ID: 380643 [Multi-domain] Cd Length: 302 Bit Score: 63.83 E-value: 9.61e-11
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| PBP1_ABC_ligand_binding-like | cd19980 | type 1 periplasmic ligand-binding domain of uncharacterized ABC (Atpase Binding Cassette)-type ... |
62-333 | 1.20e-10 | |||||||
type 1 periplasmic ligand-binding domain of uncharacterized ABC (Atpase Binding Cassette)-type active transport systems predicted to be involved in uptake of amino acids, peptides, or inorganic ions; This subgroup includes the type 1 periplasmic ligand-binding domain of uncharacterized ABC (Atpase Binding Cassette)-type active transport systems that are predicted to be involved in uptake of amino acids, peptides, or inorganic ions. This subgroup has high sequence similarity to members of the family of hydrophobic amino acid transporters (HAAT), such as leucine-isoleucine-valine binding protein (LIVBP); however, its ligand specificity has not been determined experimentally. Pssm-ID: 380635 [Multi-domain] Cd Length: 334 Bit Score: 63.78 E-value: 1.20e-10
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| PBP1_ABC_transporter_GPCR_C-like | cd04509 | Family C of G-protein coupled receptors and their close homologs, the type 1 ... |
68-270 | 1.25e-10 | |||||||
Family C of G-protein coupled receptors and their close homologs, the type 1 periplasmic-binding proteins of ATP-binding cassette transporter-like systems; This CD includes members of the family C of G-protein coupled receptors and their close homologs, the type 1 periplasmic-binding proteins of ATP-binding cassette transporter-like systems. The family C GPCR includes glutamate/glycine-gated ion channels such as the NMDA receptor, G-protein-coupled receptors, metabotropic glutamate, GABA-B, calcium sensing, pheromone receptors, and atrial natriuretic peptide-guanylate cyclase receptors. The glutamate receptors that form cation-selective ion channels, iGluR, can be classified into three different subgroups according to their binding-affinity for the agonists NMDA (N-methyl-D-asparate), AMPA (alpha-amino-3-dihydro-5-methyl-3-oxo-4-isoxazolepropionic acid), and kainate. L-glutamate is a major neurotransmitter in the brain of vertebrates and acts through either mGluRs or iGluRs. mGluRs subunits possess seven transmembrane segments and a large N-terminal extracellular domain. ABC-type leucine-isoleucine-valine binding protein (LIVBP) is a bacterial periplasmic binding protein that has homology with the amino-terminal domain of the glutamate-receptor ion channels (iGluRs). The extracellular regions of iGluRs are made of two PBP-like domains in tandem, a LIVBP-like domain that constitutes the N terminus (included in this model) followed by a domain related to lysine-arginine-ornithine-binding protein (LAOBP) that belongs to the type 2 periplasmic binding fold protein superfamily. The uncharacterized periplasmic components of various ABC-type transport systems are also included in this family. Pssm-ID: 380490 Cd Length: 306 Bit Score: 63.48 E-value: 1.25e-10
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| PBP1_ABC_HAAT-like | cd19983 | type 1 periplasmic ligand-binding domain of uncharacterized ABC (Atpase Binding Cassette)-type ... |
65-325 | 7.77e-10 | |||||||
type 1 periplasmic ligand-binding domain of uncharacterized ABC (Atpase Binding Cassette)-type active transport systems predicted to be involved in uptake of hydrophobic amino acids or peptides; This subgroup includes the type 1 periplasmic ligand-binding domain of uncharacterized ABC (Atpase Binding Cassette)-type active transport systems that are predicted to be involved in the uptake of hydrophobic amino acids or peptides. This subgroup has high sequence similarity to members of the family of hydrophobic amino acid transporters (HAAT), such as leucine-isoleucine-valine binding protein (LIVBP); however, its ligand specificity has not been determined experimentally. Pssm-ID: 380638 [Multi-domain] Cd Length: 303 Bit Score: 61.06 E-value: 7.77e-10
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| PBP1_GPC6A-like | cd06361 | ligand-binding domain of the promiscuous L-alpha-amino acid receptor GPRC6A which is a ... |
101-261 | 9.10e-10 | |||||||
ligand-binding domain of the promiscuous L-alpha-amino acid receptor GPRC6A which is a broad-spectrum amino acid-sensing receptor; This family includes the ligand-binding domain of the promiscuous L-alpha-amino acid receptor GPRC6A which is a broad-spectrum amino acid-sensing receptor, and its fish homolog, the 5.24 chemoreceptor. GPRC6A is a member of the family C of G-protein-coupled receptors that transduce extracellular signals into G-protein activation and ultimately into cellular responses. Pssm-ID: 380584 [Multi-domain] Cd Length: 401 Bit Score: 61.62 E-value: 9.10e-10
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| PBP1_iGluR_non_NMDA-like | cd06368 | N-terminal leucine-isoleucine-valine binding protein (LIVBP)-like domain of the non-NMDA ... |
101-281 | 2.32e-09 | |||||||
N-terminal leucine-isoleucine-valine binding protein (LIVBP)-like domain of the non-NMDA (N-methyl-D-aspartate) subtypes of ionotropic glutamate receptors; N-terminal leucine-isoleucine-valine binding protein (LIVBP)-like domain of the non-NMDA (N-methyl-D-asparate) subtypes of ionotropic glutamate receptors. While this N-terminal domain belongs to the periplasmic-binding fold type 1 superfamily, the glutamate-binding domain of the iGluR is structurally homologous to the periplasmic-binding fold type 2. The LIVBP-like domain of iGluRs is thought to play a role in the initial assembly of iGluR subunits, but it is not well understood how this domain is arranged and functions in intact iGluR. Glutamate mediates the majority of excitatory synaptic transmission in the central nervous system via two broad classes of ionotropic receptors, characterized by their response to glutamate agonists: N-methyl-D-aspartate (NMDA) and non-NMDA receptors. NMDA receptors have intrinsically slow kinetics, are highly permeable to Ca2+, and are blocked by extracellular Mg2+ in a voltage-dependent manner. Non-NMDA receptors have faster kinetics, are most often only weakly permeable to Ca2+, and are not blocked by extracellular Mg2+. While non-NMDA receptors typically mediate excitatory synaptic responses at resting membrane potentials, NMDA receptors contribute several forms of synaptic plasticity and are thought to play an important role in the development of synaptic pathways. Non-NMDA receptors include alpha-amino-3-hydroxy-5-methyl-4-isoxazole proprionate (AMPA) and kainate receptors. Pssm-ID: 380591 [Multi-domain] Cd Length: 339 Bit Score: 60.07 E-value: 2.32e-09
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| PBP1_iGluR_NMDA_NR1 | cd06379 | N-terminal leucine-isoleucine-valine-binding protein (LIVBP)-like domain of the NR1, an ... |
124-444 | 3.36e-09 | |||||||
N-terminal leucine-isoleucine-valine-binding protein (LIVBP)-like domain of the NR1, an essential channel-forming subunit of the NMDA receptor; N-terminal leucine-isoleucine-valine binding protein (LIVBP)-like domain of the NR1, an essential channel-forming subunit of the NMDA receptor. The ionotropic N-methyl-D-asparate (NMDA) subtype of glutamate receptor serves critical functions in neuronal development, functioning, and degeneration in the mammalian central nervous system. The functional NMDA receptor is a heterotetramer ccomposed of two NR1 and two NR2 (A, B, C, and D) or of NR3 (A and B) subunits. The receptor controls a cation channel that is highly permeable to monovalent ions and calcium and exhibits voltage-dependent inhibition by magnesium. Dual agonists, glutamate and glycine, are required for efficient activation of the NMDA receptor. When co-expressed with NR1, the NR3 subunits form receptors that are activated by glycine alone and therefore can be classified as excitatory glycine receptors. NR1/NR3 receptors are calcium-impermeable and unaffected by ligands acting at the NR2 glutamate-binding site Pssm-ID: 380602 Cd Length: 364 Bit Score: 59.66 E-value: 3.36e-09
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| PBP1_ABC_RPA1789-like | cd06333 | type 1 periplasmic binding-protein component (CouP) of an ABC system (CouPSTU; RPA1789, ... |
38-329 | 4.25e-09 | |||||||
type 1 periplasmic binding-protein component (CouP) of an ABC system (CouPSTU; RPA1789, RPA1791-1793), involved in active transport of lignin-derived aromatic substrates, and its close homologs; This group includes RPA1789 (CouP) from Rhodopseudomonas palustris and its close homologs in other bacteria. RPA1789 (CouP) is the periplasmic binding-protein component of an ABC system (CouPSTU; RPA1789, RPA1791-1793) that is involved in the active transport of lignin-derived aromatic substrates. Members of this group has high sequence similarity to members of the family of hydrophobic amino acid transporters (HAAT), such as leucine-isoleucine-valine binding protein (LIVBP). Pssm-ID: 380556 [Multi-domain] Cd Length: 342 Bit Score: 59.10 E-value: 4.25e-09
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| PBP1_SAP_GC-like | cd06370 | Ligand-binding domain of membrane bound guanylyl cyclases; Ligand-binding domain of membrane ... |
91-258 | 1.19e-08 | |||||||
Ligand-binding domain of membrane bound guanylyl cyclases; Ligand-binding domain of membrane bound guanylyl cyclases (GCs), which are known to be activated by sperm-activating peptides (SAPs), such as speract or resact. These ligand peptides are released by a range of invertebrates to stimulate the metabolism and motility of spermatozoa and are also potent chemoattractants. These GCs contain a single transmembrane segment, an extracellular ligand binding domain, and intracellular protein kinase-like and cyclase catalytic domains. GCs of insect and nematodes, which exhibit high sequence similarity to the speract receptor are also included in this model. Pssm-ID: 380593 [Multi-domain] Cd Length: 400 Bit Score: 58.03 E-value: 1.19e-08
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| PBP1_ABC_HAAT-like | cd19986 | type 1 periplasmic ligand-binding domain of uncharacterized ABC (Atpase Binding Cassette)-type ... |
38-197 | 2.66e-08 | |||||||
type 1 periplasmic ligand-binding domain of uncharacterized ABC (Atpase Binding Cassette)-type active transport systems predicted to be involved in uptake of amino acids or peptides; This subgroup includes the type 1 periplasmic ligand-binding domain of uncharacterized ABC (Atpase Binding Cassette)-type active transport systems that are predicted to be involved in the uptake of amino acids or peptides. This subgroup has high sequence similarity to members of the family of hydrophobic amino acid transporters (HAAT), such as leucine-isoleucine-valine binding protein (LIVBP); however, its ligand specificity has not been determined experimentally. Pssm-ID: 380641 [Multi-domain] Cd Length: 297 Bit Score: 56.48 E-value: 2.66e-08
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| PBP1_pheromone_receptor | cd06365 | Ligand-binding domain of the V2R pheromone receptor, a member of the family C receptors within ... |
97-416 | 3.47e-08 | |||||||
Ligand-binding domain of the V2R pheromone receptor, a member of the family C receptors within the G-protein coupled receptor superfamily; Ligand-binding domain of the V2R pheromone receptor, a member of the family C receptors within the G-protein coupled receptor superfamily, which also includes the metabotropic glutamate receptor, the GABAb receptor, the calcium-sensing receptor (CaSR), the T1R taste receptor, and a small group of uncharacterized orphan receptors. Pssm-ID: 380588 [Multi-domain] Cd Length: 464 Bit Score: 56.88 E-value: 3.47e-08
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| PBP2_Arg_Lys_His | cd13624 | Substrate binding domain of the arginine-, lysine-, histidine-binding protein ArtJ; the type 2 ... |
489-749 | 3.74e-08 | |||||||
Substrate binding domain of the arginine-, lysine-, histidine-binding protein ArtJ; the type 2 periplasmic binding protein fold; This group includes the periplasmic substrate-binding protein ArtJ of the ATP-binding cassette (ABC) transport system from the thermophilic bacterium Geobacillus stearothermophilus, which is specific for arginine, lysine, and histidine. ArtJ belongs to the type 2 periplasmic-binding fold protein (PBP2) superfamily, whose members are involved in chemotaxis and uptake of nutrients and other small molecules from the extracellular space as a primary receptor. PBP2 typically comprises of two globular subdomains connected by a flexible hinge and bind their ligand in the cleft between these domains in a manner resembling a Venus flytrap. After binding their specific ligand with high affinity, they can interact with a cognate membrane transport complex comprised of two integral membrane domains and two receptor cytoplasmically-located ATPase domains. This interaction triggers the ligand translocation across the cytoplasmic membrane energized by ATP hydrolysis. Pssm-ID: 270342 [Multi-domain] Cd Length: 219 Bit Score: 54.81 E-value: 3.74e-08
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| PBP1_ABC_ligand_binding-like | cd06343 | type 1 periplasmic ligand-binding domain of uncharacterized ABC (ATPase Binding Cassette)-type ... |
38-325 | 3.82e-08 | |||||||
type 1 periplasmic ligand-binding domain of uncharacterized ABC (ATPase Binding Cassette)-type active transport systems predicted to be involved in uptake of amino acids, peptides, or inorganic ions; This subgroup includes the type 1 periplasmic ligand-binding domain of uncharacterized ABC (ATPase Binding Cassette)-type active transport systems that are predicted to be involved in uptake of amino acids, peptides, or inorganic ions. This subgroup has high sequence similarity to members of the family of hydrophobic amino acid transporters (HAAT), such as leucine-isoleucine-valine binding protein (LIVBP); however its ligand specificity has not been determined experimentally. Pssm-ID: 380566 [Multi-domain] Cd Length: 355 Bit Score: 56.42 E-value: 3.82e-08
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| PBP2_Arg_3 | cd13622 | Substrate binding domain of an arginine 3rd transport system; the type 2 periplasmic binding ... |
459-749 | 4.38e-08 | |||||||
Substrate binding domain of an arginine 3rd transport system; the type 2 periplasmic binding fold; This subgroup is similar to the HisJ-like family that comprises the periplasmic substrate-binding proteins, including the lysine-, arginine-, ornithine-binding protein (LAO) and the histidine-binding protein (HisJ), which serve as initial receptors for active transport. HisJ and LAO proteins belong to the type 2 periplasmic-binding fold protein (PBP2) superfamily, whose members are involved in chemotaxis and uptake of nutrients and other small molecules from the extracellular space as a primary receptor. PBP2 typically comprises of two globular subdomains connected by a flexible hinge and bind their ligand in the cleft between these domains in a manner resembling a Venus flytrap. After binding their specific ligand with high affinity, they can interact with a cognate membrane transport complex comprised of two integral membrane domains and two receptor cytoplasmically-located ATPase domains. This interaction triggers the ligand translocation across the cytoplasmic membrane energized by ATP hydrolysis. Pssm-ID: 270340 [Multi-domain] Cd Length: 222 Bit Score: 54.62 E-value: 4.38e-08
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| PBP2_GluR0 | cd00997 | Bacterial GluR0 ligand-binding domain; the type 2 periplasmic binding protein fold; Glutamate ... |
490-749 | 5.88e-08 | |||||||
Bacterial GluR0 ligand-binding domain; the type 2 periplasmic binding protein fold; Glutamate receptor domain GluR0. These domains are found in the GluR0 proteins that have been shown to function as prokaryotic L-glutamate activated potassium channels, also known ionotropic glutamate receptors or iGluRs. In addition to two ligand binding core domains, iGluRs typically have a channel-like domain inserted in the middle of the GluR-like domain. The GluR0 proteins belong to the PBP2 superfamily of periplasmic binding proteins that differ in size and ligand specificity, but have similar tertiary structures consisting of two globular subdomains connected by a flexible hinge. They have been shown to bind their ligand in the cleft between these domains in a manner resembling a Venus flytrap. Pssm-ID: 270218 [Multi-domain] Cd Length: 218 Bit Score: 54.26 E-value: 5.88e-08
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| PBP2_GlnH | cd00994 | Glutamine binding domain of ABC-type transporter; the type 2 periplasmic binding protein fold; ... |
461-748 | 1.86e-07 | |||||||
Glutamine binding domain of ABC-type transporter; the type 2 periplasmic binding protein fold; This periplasmic substrate-binding component serves as an initial receptor in the ABC transport of glutamine in bacteria and eukaryota. GlnH belongs to the type 2 periplasmic-binding fold protein (PBP2) superfamily, whose members are involved in chemotaxis and uptake of nutrients and other small molecules from the extracellular space as a primary receptor. PBP2 typically comprises of two globular subdomains connected by a flexible hinge and bind their ligand in the cleft between these domains in a manner resembling a Venus flytrap. After binding their specific ligand with high affinity, they can interact with a cognate membrane transport complex comprised of two integral membrane domains and two receptor cytoplasmically-located ATPase domains. This interaction triggers the ligand translocation across the cytoplasmic membrane energized by ATP hydrolysis. Pssm-ID: 270216 [Multi-domain] Cd Length: 218 Bit Score: 52.66 E-value: 1.86e-07
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| PBP1_mGluR_groupI | cd06374 | ligand binding domain of the group I metabotropic glutamate receptor; Ligand binding domain of ... |
97-271 | 2.71e-07 | |||||||
ligand binding domain of the group I metabotropic glutamate receptor; Ligand binding domain of the group I metabotropic glutamate receptor, a family containing mGlu1R and mGlu5R, all of which stimulate phospholipase C (PLC) hydrolysis. The metabotropic glutamate receptor is a member of the family C of G-protein-coupled receptors that transduce extracellular signals into G-protein activation and ultimately into intracellular responses. The mGluRs are classified into three groups which comprise eight subtypes. Pssm-ID: 380597 [Multi-domain] Cd Length: 474 Bit Score: 54.27 E-value: 2.71e-07
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| PBP1_aromatic_compounds-like | cd06332 | type 1 periplasmic binding proteins of active transport systems predicted to be involved in ... |
38-385 | 3.70e-07 | |||||||
type 1 periplasmic binding proteins of active transport systems predicted to be involved in transport of aromatic compounds such as 2-nitrobenzoic acid and alkylbenzenes; This group includes the type 1 periplasmic binding proteins of active transport systems that are predicted to be involved in transport of aromatic compounds such as 2-nitrobenzoic acid and alkylbenzenes; their substrate specificities are not well characterized, however. Members also exhibit close similarity to active transport systems for short chain amides and/or urea found in bacteria and archaea. Pssm-ID: 380555 [Multi-domain] Cd Length: 336 Bit Score: 52.99 E-value: 3.70e-07
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| Lig_chan-Glu_bd | pfam10613 | Ligated ion channel L-glutamate- and glycine-binding site; This region, sometimes called the ... |
475-566 | 4.82e-07 | |||||||
Ligated ion channel L-glutamate- and glycine-binding site; This region, sometimes called the S1 domain, is the luminal domain just upstream of the first, M1, transmembrane region of transmembrane ion-channel proteins, and it binds L-glutamate and glycine. It is found in association with Lig_chan, pfam00060. Pssm-ID: 463166 [Multi-domain] Cd Length: 111 Bit Score: 49.05 E-value: 4.82e-07
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| PBP1_ABC_LIVBP-like | cd06342 | type 1 periplasmic ligand-binding domain of ABC (Atpase Binding Cassette)-type active ... |
53-397 | 1.40e-06 | |||||||
type 1 periplasmic ligand-binding domain of ABC (Atpase Binding Cassette)-type active transport systems involved in the transport of all three branched chain aliphatic amino acids (leucine, isoleucine and valine); This subgroup includes the type 1 periplasmic ligand-binding domain of ABC (Atpase Binding Cassette)-type active transport systems that are involved in the transport of all three branched chain aliphatic amino acids (leucine, isoleucine and valine). This subgroup also includes a leucine-specific binding protein (or LivK), which is very similar in sequence and structure to leucine-isoleucine-valine binding protein (LIVBP). ABC-type active transport systems are transmembrane proteins that function in the transport of diverse sets of substrates across extra- and intracellular membranes, including carbohydrates, amino acids, inorganic ions, dipeptides and oligopeptides, metabolic products, lipids and sterols, and heme, to name a few. Pssm-ID: 380565 [Multi-domain] Cd Length: 334 Bit Score: 51.37 E-value: 1.40e-06
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| PBP1_CaSR | cd06364 | ligand-binding domain of the CaSR calcium-sensing receptor, a member of the family C receptors ... |
78-215 | 1.59e-06 | |||||||
ligand-binding domain of the CaSR calcium-sensing receptor, a member of the family C receptors within the G-protein coupled receptor superfamily; Ligand-binding domain of the CaSR calcium-sensing receptor, which is a member of the family C receptors within the G-protein coupled receptor superfamily. CaSR provides feedback control of extracellular calcium homeostasis by responding sensitively to acute fluctuations in extracellular ionized Ca2+ concentration. This ligand-binding domain has homology to the bacterial leucine-isoleucine-valine binding protein (LIVBP) and a leucine binding protein (LBP). CaSR is widely expressed in mammalian tissues and is active in tissues that are not directly involved in extracellular calcium homeostasis. Moreover, CaSR responds to aromatic, aliphatic, and polar amino acids, but not to positively charged or branched chain amino acids, which suggests that changes in plasma amino acid levels are likely to modulate whole body calcium metabolism. Additionally, the family C GPCRs includes at least two receptors with broad-spectrum amino acid-sensing properties: GPRC6A which recognizes basic and various aliphatic amino acids, its gold-fish homolog the 5.24 chemoreceptor, and a specific taste receptor (T1R) which responds to aliphatic, polar, charged, and branched amino acids, but not to aromatic amino acids. Pssm-ID: 380587 [Multi-domain] Cd Length: 473 Bit Score: 51.49 E-value: 1.59e-06
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| PBP2_iGluR_NMDA_Nr2 | cd13718 | The ligand-binding domain of the NR2 subunit of ionotropic NMDA (N-methyl-D-aspartate) ... |
456-571 | 1.67e-06 | |||||||
The ligand-binding domain of the NR2 subunit of ionotropic NMDA (N-methyl-D-aspartate) glutamate receptors, a member of the type 2 periplasmic binding fold protein superfamily; This group contains the ligand-binding domain of the NR2 subunit of NMDA receptor family. The ionotropic N-methyl-d-asparate (NMDA) subtype of glutamate receptors serves critical functions in neuronal development, functioning, and degeneration in the mammalian central nervous system. The functional NMDA receptor is a heterotetramer composed of two NR1 and two NR2 (A, B, C, and D) or of NR3 (A and B) subunits. The receptor controls a cation channel that is highly permeable to monovalent ions and calcium and exhibits voltage-dependent inhibition by magnesium. Dual agonists, glutamate and glycine, are required for efficient activation of the NMDA receptor. Among NMDA receptor subtypes, the NR2B subunit containing receptors appear particularly important for pain perception; thus NR2B-selective antagonists may be useful in the treatment of chronic pain. Pssm-ID: 270436 [Multi-domain] Cd Length: 283 Bit Score: 50.80 E-value: 1.67e-06
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| PBP2_iGluR_NMDA | cd13687 | The ligand-binding domain of the NMDA (N-methyl-D-aspartate) subtype of ionotropic glutamate ... |
491-749 | 2.22e-06 | |||||||
The ligand-binding domain of the NMDA (N-methyl-D-aspartate) subtype of ionotropic glutamate receptors, a member of the type 2 periplasmic binding fold protein superfamily; The ligand-binding domain of the ionotropic NMDA subtype is structurally homologous to the periplasmic-binding fold type II superfamily, while the N-terminal domain belongs to the periplasmic-binding fold type I. The function of the NMDA subtype receptor serves critical functions in neuronal development, functioning, and degeneration in the mammalian central nervous system. The functional NMDA receptor is a heterotetramer comprising two NR1 and two NR2 (A, B, C, and D) or NR3 (A and B) subunits. The receptor controls a cation channel that is highly permeable to monovalent ions and calcium and exhibits voltage-dependent inhibition by magnesium. Dual agonists, glutamate and glycine, are required for efficient activation of the NMDA receptor. Among NMDA receptor subtypes, the NR2B subunit containing receptors appear particularly important for pain perception; thus NR2B-selective antagonists may be useful in the treatment of chronic pain. Pssm-ID: 270405 [Multi-domain] Cd Length: 239 Bit Score: 49.94 E-value: 2.22e-06
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| PBP2_Ala | cd13628 | Periplasmic substrate binding domain of ABC-type transporter specific to alanine; the type 2 ... |
633-748 | 2.34e-06 | |||||||
Periplasmic substrate binding domain of ABC-type transporter specific to alanine; the type 2 periplasmic binding protein; This periplasmic substrate component serves as an initial receptor in the ABC transport of glutamine in eubacteria and archaea. After binding the alanine with high affinity, this domain Interacts with a cognate membrane transport complex comprised of two integral membrane domains and two cytoplasmically-located ATPase domains. This interaction triggers the ligand translocation across the cytoplasmic membrane energized by ATP hydrolysis. This alanine specific domain belong to the PBP2 superfamily of periplasmic binding proteins that differ in size and ligand specificity, but have similar tertiary structures consisting of two globular subdomains connected by a flexible hinge. They have been shown to bind their ligand in the cleft between these domains in a manner resembling a Venus flytrap. Pssm-ID: 270346 [Multi-domain] Cd Length: 219 Bit Score: 49.39 E-value: 2.34e-06
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| PBP2_AA_binding_like_1 | cd13625 | Substrate-binding domain of putative amino acid-binding protein; the type 2 ... |
489-748 | 7.26e-06 | |||||||
Substrate-binding domain of putative amino acid-binding protein; the type 2 periplasmic-binding protein fold; This putative amino acid-binding protein belongs to the type 2 periplasmic-binding fold protein (PBP2) superfamily, whose members are involved in chemotaxis and uptake of nutrients and other small molecules from the extracellular space as a primary receptor. PBP2 typically comprises of two globular subdomains connected by a flexible hinge and bind their ligand in the cleft between these domains in a manner resembling a Venus flytrap. After binding their specific ligand with high affinity, they can interact with a cognate membrane transport complex comprised of two integral membrane domains and two receptor cytoplasmically-located ATPase domains. This interaction triggers the ligand translocation across the cytoplasmic membrane energized by ATP hydrolysis. Pssm-ID: 270343 [Multi-domain] Cd Length: 230 Bit Score: 48.14 E-value: 7.26e-06
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| PBP2_iGluR_kainate_KA1 | cd13724 | The ligand-binding domain of the kainate subtype KA1 of ionotropic glutamate receptors, a ... |
491-748 | 1.14e-05 | |||||||
The ligand-binding domain of the kainate subtype KA1 of ionotropic glutamate receptors, a member of the type 2 periplasmic-binding fold protein superfamily; This group contains the ligand-binding domain of the KA1 subunit of kainate receptor. While this ligand-binding domain is structurally homologous to the periplasmic binding fold type II superfamily, the N_terminal domain of kainate receptors belongs to the periplasmic-binding fold type I. There are five types of kainate receptors, GluR5, GluR6, GluR7, KA1, and KA2, which are structurally similar to AMPA and NMDA subunits of ionotropic glutamate receptors. KA1 and KA2 subunits can only form functional receptors with one of the GluR5-7 subunits. Moreover, GluR5-7 can also form functional homomeric receptor channels activated by kainate and glutamate when expressed in heterologous systems. Kainate receptors are involved in excitatory neurotransmission by activating postsynaptic receptors and in inhibitory neurotransmission by modulating release of the inhibitory neurotransmitter GABA through a presynaptic mechanism. Kainate receptors are closely related to AMAP receptors. In contrast of AMPA receptors, kainate receptors play only a minor role in signaling at synapses and their function is not well defined. Pssm-ID: 270442 [Multi-domain] Cd Length: 333 Bit Score: 48.47 E-value: 1.14e-05
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| PBP1_ABC_HAAT-like | cd06344 | type 1 periplasmic ligand-binding domain of uncharacterized ABC (Atpase Binding Cassette)-type ... |
73-241 | 1.14e-05 | |||||||
type 1 periplasmic ligand-binding domain of uncharacterized ABC (Atpase Binding Cassette)-type active transport systems predicted to be involved in uptake of hydrophobic amino acids or peptides; This subgroup includes the type 1 periplasmic ligand-binding domain of uncharacterized ABC (Atpase Binding Cassette)-type active transport systems that are predicted to be involved in the uptake of hydrophobic amino acids or peptides. This subgroup has high sequence similarity to members of the family of hydrophobic amino acid transporters (HAAT), such as leucine-isoleucine-valine binding protein (LIVBP); however, its ligand specificity has not been determined experimentally. Pssm-ID: 380567 [Multi-domain] Cd Length: 332 Bit Score: 48.38 E-value: 1.14e-05
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| PBP1_ABC_HAAT-like | cd06348 | type 1 periplasmic ligand-binding domain of uncharacterized ABC (Atpase Binding Cassette)-type ... |
37-199 | 3.13e-05 | |||||||
type 1 periplasmic ligand-binding domain of uncharacterized ABC (Atpase Binding Cassette)-type active transport systems predicted to be involved in uptake of amino acids or peptides; This subgroup includes the type 1 periplasmic ligand-binding domain of uncharacterized ABC (Atpase Binding Cassette)-type active transport systems that are predicted to be involved in the uptake of amino acids or peptides. This subgroup has high sequence similarity to members of the family of hydrophobic amino acid transporters (HAAT), such as leucine-isoleucine-valine binding protein (LIVBP); however, its ligand specificity has not been determined experimentally. Pssm-ID: 380571 [Multi-domain] Cd Length: 342 Bit Score: 47.23 E-value: 3.13e-05
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| PBP1_mGluR_groupIII | cd06376 | ligand-binding domain of the group III metabotropic glutamate receptor; Ligand-binding domain ... |
96-258 | 3.64e-05 | |||||||
ligand-binding domain of the group III metabotropic glutamate receptor; Ligand-binding domain of the group III metabotropic glutamate receptor, a family which contains mGlu4R, mGluR6R, mGluR7, and mGluR8; all of which inhibit adenylyl cyclase. The metabotropic glutamate receptor is a member of the family C of G-protein-coupled receptors that transduce extracellular signals into G-protein activation and ultimately into intracellular responses. The mGluRs are classified into three groups which comprise eight subtypes. Pssm-ID: 380599 [Multi-domain] Cd Length: 467 Bit Score: 47.10 E-value: 3.64e-05
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| PBP1_mGluR_groupII | cd06375 | ligand binding domain of the group II metabotropic glutamate receptor; Ligand binding domain ... |
101-270 | 4.32e-05 | |||||||
ligand binding domain of the group II metabotropic glutamate receptor; Ligand binding domain of the group II metabotropic glutamate receptor, a family that contains mGlu2R and mGlu3R, all of which inhibit adenylyl cyclase. The metabotropic glutamate receptor is a member of the family C of G-protein-coupled receptors that transduce extracellular signals into G-protein activation and ultimately into intracellular responses. The mGluRs are classified into three groups which comprise eight subtypes Pssm-ID: 380598 [Multi-domain] Cd Length: 462 Bit Score: 47.12 E-value: 4.32e-05
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| PBP1_ABC_ligand_binding-like | cd19982 | type 1 periplasmic ligand-binding domain of uncharacterized ABC (ATPase Binding Cassette)-type ... |
38-256 | 4.52e-05 | |||||||
type 1 periplasmic ligand-binding domain of uncharacterized ABC (ATPase Binding Cassette)-type active transport systems predicted to be involved in transport of amino acids, peptides, or inorganic ions; This subgroup includes the type 1 periplasmic ligand-binding domain of uncharacterized ABC (ATPase Binding Cassette)-type active transport systems that are predicted to be involved in transport of amino acids, peptides, or inorganic ions. This subgroup has high sequence similarity to members of the family of hydrophobic amino acid transporters (HAAT), such as leucine-isoleucine-valine binding protein (LIVBP); however, their ligand specificity has not been determined experimentally. Pssm-ID: 380637 [Multi-domain] Cd Length: 302 Bit Score: 46.51 E-value: 4.52e-05
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| PBP2_iGluR_Kainate_GluR7 | cd13723 | GluR7 subtype of kainate receptor, type 2 periplasmic-binding fold superfamily; This group ... |
491-748 | 5.45e-05 | |||||||
GluR7 subtype of kainate receptor, type 2 periplasmic-binding fold superfamily; This group contains glutamate receptor domain GluR. These domains are found in the GluR proteins that have been shown to function as L-glutamate activated potassium channels, also known ionotropic glutamate receptors or iGluRs. In addition to two ligand binding core domains, iGluRs typically have a channel-like domain inserted in the middle of the GluR-like domain. Animal iGluRs mediate the ion flux in the synapses of the CNS and can be subdivided into several classes depending on the neurotransmitter specificity and ion conductance properties. Their plant homologs have been shown to function in light signal transduction and calcium homeostasis. The GluR proteins belong to the PBPII superfamily of periplasmic binding proteins that differ in size and ligand specificity, but have similar tertiary structures consisting of two globular subdomains connected by a flexible hinge. They have been shown to bind their ligand in the cleft between these domains in a manner resembling a Venus flytrap. Pssm-ID: 270441 [Multi-domain] Cd Length: 369 Bit Score: 46.61 E-value: 5.45e-05
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| PBP2_BvgS_HisK_like | cd01007 | The type 2 periplasmic ligand-binding protein domain of the sensor-kinase BvgS and histidine ... |
622-749 | 8.86e-05 | |||||||
The type 2 periplasmic ligand-binding protein domain of the sensor-kinase BvgS and histidine kinase receptors, and related proteins; This family comprises the periplasmic sensor domain of the two-component sensor-kinase systems, such as the sensor protein BvgS of Bordetella pertussis and histidine kinase receptors (HisK), and uncharacterized related proteins. Typically, the two-component system consists of a membrane spanning sensor-kinase and a cytoplasmic response regulator. It serves as a stimulus-response coupling mechanism to enable microorganisms to sense and respond to changes in environmental conditions. The N-terminal sensing domain of the sensor kinase detects extracellular signals, such as small molecule ligands and ions, which then modulate the catalytic activity of the cytoplasmic kinase domain through a phosphorylation cascade. The periplasmic sensor domain belongs to the type 2 periplasmic-binding fold protein (PBP2) superfamily, whose members are involved in chemotaxis and uptake of nutrients and other small molecules from the extracellular space as a primary receptor. PBP2 typically comprises of two globular subdomains connected by a flexible hinge and bind their ligand in the cleft between these domains in a manner resembling a Venus flytrap. After binding their specific ligand with high affinity, they can interact with a cognate membrane transport complex comprised of two integral membrane domains and two receptor cytoplasmically-located ATPase domains. This interaction triggers the ligand translocation across the cytoplasmic membrane energized by ATP hydrolysis. Pssm-ID: 270228 [Multi-domain] Cd Length: 220 Bit Score: 44.83 E-value: 8.86e-05
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| PBP1_ABC_ligand_binding-like | cd06345 | type 1 periplasmic ligand-binding domain of uncharacterized ABC (Atpase Binding Cassette)-type ... |
71-211 | 1.16e-04 | |||||||
type 1 periplasmic ligand-binding domain of uncharacterized ABC (Atpase Binding Cassette)-type active transport systems predicted to be involved in uptake of amino acids, peptides, or inorganic ions; This subgroup includes the type 1 periplasmic ligand-binding domain of uncharacterized ABC (Atpase Binding Cassette)-type active transport systems that are predicted to be involved in uptake of amino acids, peptides, or inorganic ions. This subgroup has high sequence similarity to members of the family of hydrophobic amino acid transporters (HAAT), such as leucine-isoleucine-valine binding protein (LIVBP); however, its ligand specificity has not been determined experimentally. Pssm-ID: 380568 [Multi-domain] Cd Length: 356 Bit Score: 45.33 E-value: 1.16e-04
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| PBP1_ABC_ligand_binding-like | cd06335 | type 1 periplasmic ligand-binding domain of uncharacterized ABC (ATPase Binding Cassette)-type ... |
68-333 | 1.65e-04 | |||||||
type 1 periplasmic ligand-binding domain of uncharacterized ABC (ATPase Binding Cassette)-type active transport systems predicted to be involved in transport of amino acids, peptides, or inorganic ions; This subgroup includes the type 1 periplasmic ligand-binding domain of uncharacterized ABC (ATPase Binding Cassette)-type active transport systems that are predicted to be involved in transport of amino acids, peptides, or inorganic ions. Members of this group are sequence-similar to members of the family of ABC-type hydrophobic amino acid transporters, such as leucine-isoleucine-valine binding protein (LIVBP); however their ligand specificity has not been determined experimentally. Pssm-ID: 380558 [Multi-domain] Cd Length: 348 Bit Score: 44.91 E-value: 1.65e-04
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| PBP2_Dsm1740 | cd13629 | Amino acid-binding domain of the type 2 periplasmic binding fold superfamily; This subfamily ... |
536-749 | 1.67e-04 | |||||||
Amino acid-binding domain of the type 2 periplasmic binding fold superfamily; This subfamily includes the periplasmic binding protein type II (BPBII). This domain is found in solute binding proteins that serve as initial receptors in the ABC transport, signal transduction and channel gating. The PBPII proteins share the same architecture as periplasmic binding proteins type I (PBPI), but have a different topology. They are typically comprised of two globular subdomains connected by a flexible hinge and bind their ligand in the cleft between these domains in a manner resembling a Venus flytrap. The majority of PBPII proteins function in the uptake of small soluble substrates in eubacteria and archaea. After binding their specific ligand with high affinity, they can interact with a cognate membrane transport complex comprised of two integral membrane domains and two cytoplasmically-located ATPase domains. This interaction triggers the ligand translocation across the cytoplasmic membrane energized by ATP hydrolysis. Besides transport proteins, the family includes ionotropic glutamate receptors and unorthodox sensor proteins involved in signal transduction. Pssm-ID: 270347 [Multi-domain] Cd Length: 221 Bit Score: 44.10 E-value: 1.67e-04
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| PBP1_ABC_ligand_binding-like | cd06326 | periplasmic ligand-binding domain of uncharacterized ABC-type transport systems predicted to ... |
80-199 | 8.74e-04 | |||||||
periplasmic ligand-binding domain of uncharacterized ABC-type transport systems predicted to be involved in uptake of amino acids, peptides, or inorganic ions; This group includes the type 1 periplasmic ligand-binding domain of uncharacterized ABC (ATPase Binding Cassette)-type transport systems that are predicted to be involved in the uptake of amino acids, peptides, or inorganic ions. This subgroup has high sequence similarity to members of the family of hydrophobic amino acid transporters (HAAT), such as leucine-isoleucine-valine binding protein (LIVBP); its ligand specificity has not been determined experimentally, however. Pssm-ID: 380549 [Multi-domain] Cd Length: 339 Bit Score: 42.53 E-value: 8.74e-04
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| PBP2_iGluR_Kainate | cd13714 | Kainate receptor of the type 2 periplasmic-binding fold superfamily; This group contains ... |
491-566 | 1.22e-03 | |||||||
Kainate receptor of the type 2 periplasmic-binding fold superfamily; This group contains glutamate receptor domain GluR. These domains are found in the GluR proteins that have been shown to function as L-glutamate activated potassium channels, also known ionotropic glutamate receptors or iGluRs. In addition to two ligand binding core domains, iGluRs typically have a channel-like domain inserted in the middle of the GluR-like domain. Animal iGluRs mediate the ion flux in the synapses of the CNS and can be subdivided into several classes depending on the neurotransmitter specificity and ion conductance properties. Their plant homologs have been shown to function in light signal transduction and calcium homeostasis. The GluR proteins belong to the PBPII superfamily of periplasmic binding proteins that differ in size and ligand specificity, but have similar tertiary structures consisting of two globular subdomains connected by a flexible hinge. They have been shown to bind their ligand in the cleft between these domains in a manner resembling a Venus flytrap. Pssm-ID: 270432 [Multi-domain] Cd Length: 251 Bit Score: 41.75 E-value: 1.22e-03
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| PBP1_iGluR_Kainate | cd06382 | N-terminal leucine-isoleucine-valine binding protein (LIVBP)-like domain of the kainate ... |
101-261 | 6.21e-03 | |||||||
N-terminal leucine-isoleucine-valine binding protein (LIVBP)-like domain of the kainate receptors; N-terminal leucine-isoleucine-valine binding protein (LIVBP)-like domain of the kainate receptors, non-NMDA ionotropic receptors which respond to the neurotransmitter glutamate. While this N-terminal domain belongs to the periplasmic-binding fold type 1 superfamily, the glutamate-binding domain of the iGluR is structurally homologous to the periplasmic-binding fold type 2. The LIVBP-like domain of iGluRs is thought to play a role in the initial assembly of iGluR subunits, but it is not well understood how this domain is arranged and functions in intact iGluR. Kainate receptors have five subunits, GluR5, GluR6, GluR7, KA1 and KA2, which are structurally similar to AMPA and NMDA subunits of ionotropic glutamate receptors. KA1 and KA2 subunits can only form functional receptors with one of the GluR5-7 subunits. Moreover, GluR5-7 can also form functional homomeric receptor channels activated by kainate and glutamate when expressed in heterologous systems. Kainate receptors are involved in excitatory neurotransmission by activating postsynaptic receptors and in inhibitory neurotransmission by modulating release of the inhibitory neurotransmitter GABA through a presynaptic mechanism. Kainate receptors are closely related to AMAP receptors. In contrast of AMPA receptors, kainate receptors play only a minor role in signaling at synapses and their function is not well defined. Pssm-ID: 380605 Cd Length: 335 Bit Score: 39.90 E-value: 6.21e-03
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| PBP1_YraM_LppC_lipoprotein-like | cd06339 | periplasmic binding component of lipoprotein LppC, an immunodominant antigen; This subgroup ... |
53-194 | 8.83e-03 | |||||||
periplasmic binding component of lipoprotein LppC, an immunodominant antigen; This subgroup includes periplasmic binding component of lipoprotein LppC, an immunodominant antigen, whose molecular function is not characterized. Members of this subgroup are predicted to be involved in transport of lipid compounds, and they are sequence similar to the family of ABC-type hydrophobic amino acid transporters (HAAT). Pssm-ID: 380562 [Multi-domain] Cd Length: 331 Bit Score: 39.18 E-value: 8.83e-03
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