ATP-dependent Clp protease proteolytic subunit [Methanocaldococcus vulcanius]
Protein Classification
SDH_sah domain-containing protein( domain architecture ID 12028999)
SDH_sah domain-containing protein
List of domain hits
| Name | Accession | Description | Interval | E-value | |||||
| SDH_sah | pfam01972 | Serine dehydrogenase proteinase; This family of archaebacterial proteins, formerly known as ... |
1-276 | 9.29e-177 | |||||
Serine dehydrogenase proteinase; This family of archaebacterial proteins, formerly known as DUF114, has been found to be a serine dehydrogenase proteinase distantly related to ClpP proteinases that belong to the serine proteinase superfamily. The family has a catalytic triad of Ser, Asp, His residues, which shows an altered residue ordering compared with the ClpP proteinases but similar to that of the carboxypeptidase clan. : Pssm-ID: 110924 Cd Length: 286 Bit Score: 488.59 E-value: 9.29e-177
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| Name | Accession | Description | Interval | E-value | |||||
| SDH_sah | pfam01972 | Serine dehydrogenase proteinase; This family of archaebacterial proteins, formerly known as ... |
1-276 | 9.29e-177 | |||||
Serine dehydrogenase proteinase; This family of archaebacterial proteins, formerly known as DUF114, has been found to be a serine dehydrogenase proteinase distantly related to ClpP proteinases that belong to the serine proteinase superfamily. The family has a catalytic triad of Ser, Asp, His residues, which shows an altered residue ordering compared with the ClpP proteinases but similar to that of the carboxypeptidase clan. Pssm-ID: 110924 Cd Length: 286 Bit Score: 488.59 E-value: 9.29e-177
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| S14_ClpP_1 | cd07016 | Caseinolytic protease (ClpP) is an ATP-dependent, highly conserved serine protease; Clp ... |
75-240 | 7.18e-17 | |||||
Caseinolytic protease (ClpP) is an ATP-dependent, highly conserved serine protease; Clp protease (caseinolytic protease; ClpP; Peptidase S14) is a highly conserved serine protease present throughout in bacteria and eukaryota, but seems to be absent in archaea, mollicutes and some fungi. This subfamily only contains bacterial sequences. Clp proteases are involved in a number of cellular processes such as degradation of misfolded proteins, regulation of short-lived proteins and housekeeping removal of dysfunctional proteins. They are also implicated in the control of cell growth, targeting DNA-binding protein from starved cells. ClpP has also been linked to the tight regulation of virulence genes in the pathogens Listeria monocytogenes and Salmonella typhimurium. This enzyme belong to the family of ATP-dependent proteases; the functional Clp protease is comprised of two components: a proteolytic component and one of several regulatory ATPase components, both of which are required for effective levels of protease activity in the presence of ATP, although the proteolytic subunit alone does possess some catalytic activity. Active site consists of the triad Ser, His and Asp; some members have lost all of these active site residues and are therefore inactive, while others may have one or two large insertions. ClpP seems to prefer hydrophobic or non-polar residues at P1 or P1' positions in its substrate. The protease exists as a tetradecamer made up of two heptameric rings stacked back-to-back such that the catalytic triad of each subunit is located at the interface between three monomers, thus making oligomerization essential for function. Pssm-ID: 132927 [Multi-domain] Cd Length: 160 Bit Score: 76.03 E-value: 7.18e-17
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| NfeD | COG1030 | Membrane-bound serine protease NfeD, ClpP class [Posttranslational modification, protein ... |
65-155 | 1.36e-10 | |||||
Membrane-bound serine protease NfeD, ClpP class [Posttranslational modification, protein turnover, chaperones]; Pssm-ID: 440653 [Multi-domain] Cd Length: 413 Bit Score: 61.03 E-value: 1.36e-10
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| SppA_67K | TIGR00705 | signal peptide peptidase SppA, 67K type; This model represents the signal peptide peptidase A ... |
78-153 | 2.47e-07 | |||||
signal peptide peptidase SppA, 67K type; This model represents the signal peptide peptidase A (SppA, protease IV) as found in E. coli, Treponema pallidum, Mycobacterium leprae, and several other species, in which it has a molecular mass around 67 kDa and a duplication such that the N-terminal half shares extensive homology with the C-terminal half. This enzyme was shown in E. coli to form homotetramers. E. coli SohB, which is most closely homologous to the C-terminal duplication of SppA, is predicted to perform a similar function of small peptide degradation, but in the periplasm. Many prokaryotes have a single SppA/SohB homolog that may perform the function of either or both. [Protein fate, Degradation of proteins, peptides, and glycopeptides] Pssm-ID: 273226 [Multi-domain] Cd Length: 584 Bit Score: 51.37 E-value: 2.47e-07
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| Name | Accession | Description | Interval | E-value | |||||
| SDH_sah | pfam01972 | Serine dehydrogenase proteinase; This family of archaebacterial proteins, formerly known as ... |
1-276 | 9.29e-177 | |||||
Serine dehydrogenase proteinase; This family of archaebacterial proteins, formerly known as DUF114, has been found to be a serine dehydrogenase proteinase distantly related to ClpP proteinases that belong to the serine proteinase superfamily. The family has a catalytic triad of Ser, Asp, His residues, which shows an altered residue ordering compared with the ClpP proteinases but similar to that of the carboxypeptidase clan. Pssm-ID: 110924 Cd Length: 286 Bit Score: 488.59 E-value: 9.29e-177
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| S14_ClpP_1 | cd07016 | Caseinolytic protease (ClpP) is an ATP-dependent, highly conserved serine protease; Clp ... |
75-240 | 7.18e-17 | |||||
Caseinolytic protease (ClpP) is an ATP-dependent, highly conserved serine protease; Clp protease (caseinolytic protease; ClpP; Peptidase S14) is a highly conserved serine protease present throughout in bacteria and eukaryota, but seems to be absent in archaea, mollicutes and some fungi. This subfamily only contains bacterial sequences. Clp proteases are involved in a number of cellular processes such as degradation of misfolded proteins, regulation of short-lived proteins and housekeeping removal of dysfunctional proteins. They are also implicated in the control of cell growth, targeting DNA-binding protein from starved cells. ClpP has also been linked to the tight regulation of virulence genes in the pathogens Listeria monocytogenes and Salmonella typhimurium. This enzyme belong to the family of ATP-dependent proteases; the functional Clp protease is comprised of two components: a proteolytic component and one of several regulatory ATPase components, both of which are required for effective levels of protease activity in the presence of ATP, although the proteolytic subunit alone does possess some catalytic activity. Active site consists of the triad Ser, His and Asp; some members have lost all of these active site residues and are therefore inactive, while others may have one or two large insertions. ClpP seems to prefer hydrophobic or non-polar residues at P1 or P1' positions in its substrate. The protease exists as a tetradecamer made up of two heptameric rings stacked back-to-back such that the catalytic triad of each subunit is located at the interface between three monomers, thus making oligomerization essential for function. Pssm-ID: 132927 [Multi-domain] Cd Length: 160 Bit Score: 76.03 E-value: 7.18e-17
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| Clp_protease_NfeD_like | cd07021 | Nodulation formation efficiency D (NfeD) is a membrane-bound ClpP-class protease; Nodulation ... |
65-163 | 1.97e-16 | |||||
Nodulation formation efficiency D (NfeD) is a membrane-bound ClpP-class protease; Nodulation formation efficiency D (NfeD; stomatin operon partner protein, STOPP; DUF107) is a member of membrane-anchored ClpP-class proteases. Currently, more than 300 NfeD homologs have been identified - all of which are bacterial or archaeal in origin. Majority of these genomes have been shown to possess operons containing a homologous NfeD/stomatin gene pair, causing NfeD to be previously named STOPP (stomatin operon partner protein). NfeD homologs can be divided into two groups: long and short forms. Long-form homologs have a putative ClpP-class serine protease domain while the short form homologs do not. Downstream from the ClpP-class domain is the so-called NfeD or DUF107 domain. N-terminal region of the NfeD homolog PH1510 (1510-N or PH1510-N) from Pyrococcus horikoshii has been shown to possess serine protease activity and has a Ser-Lys catalytic dyad, preferentially cleaving hydrophobic substrates. Difference in oligomeric form and catalytic residues between 1510-N (forming a dimer) and ClpP (forming a tetradecamer) shows a possible functional difference: 1510-N is likely to have a regulatory function while ClpP is involved in protein quality control. Pssm-ID: 132932 [Multi-domain] Cd Length: 178 Bit Score: 75.32 E-value: 1.97e-16
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| NfeD | COG1030 | Membrane-bound serine protease NfeD, ClpP class [Posttranslational modification, protein ... |
65-155 | 1.36e-10 | |||||
Membrane-bound serine protease NfeD, ClpP class [Posttranslational modification, protein turnover, chaperones]; Pssm-ID: 440653 [Multi-domain] Cd Length: 413 Bit Score: 61.03 E-value: 1.36e-10
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| Clp_protease_like | cd00394 | Caseinolytic protease (ClpP) is an ATP-dependent protease; Clp protease (caseinolytic protease; ... |
73-168 | 1.03e-08 | |||||
Caseinolytic protease (ClpP) is an ATP-dependent protease; Clp protease (caseinolytic protease; ClpP; endopeptidase Clp; Peptidase S14; ATP-dependent protease, ClpAP)-like enzymes are highly conserved serine proteases and belong to the ClpP/Crotonase superfamily. Included in this family are Clp proteases that are involved in a number of cellular processes such as degradation of misfolded proteins, regulation of short-lived proteins and housekeeping removal of dysfunctional proteins. They are also implicated in the control of cell growth, targeting DNA-binding protein from starved cells. The functional Clp protease is comprised of two components: a proteolytic component and one of several regulatory ATPase components, both of which are required for effective levels of protease activity in the presence of ATP. Active site consists of the triad Ser, His and Asp, preferring hydrophobic or non-polar residues at P1 or P1' positions. The protease exists as a tetradecamer made up of two heptameric rings stacked back-to-back such that the catalytic triad of each subunit is located at the interface between three monomers, thus making oligomerization essential for function. Another family included in this class of enzymes is the signal peptide peptidase A (SppA; S49) which is involved in the cleavage of signal peptides after their removal from the precursor proteins by signal peptidases. Mutagenesis studies suggest that the catalytic center of SppA comprises a Ser-Lys dyad and not the usual Ser-His-Asp catalytic triad found in the majority of serine proteases. In addition to the carboxyl-terminal protease domain that is conserved in all the S49 family members, the E. coli SppA contains an amino-terminal domain. Others, including sohB peptidase, protein C, protein 1510-N and archaeal signal peptide peptidase, do not contain the amino-terminal domain. The third family included in this hierarchy is nodulation formation efficiency D (NfeD) which is a membrane-bound Clp-class protease and only found in bacteria and archaea. Majority of the NfeD genomes have been shown to possess operons containing a homologous NfeD/stomatin gene pair, causing NfeD to be previously named stomatin operon partner protein (STOPP). NfeD homologs can be divided into two groups: long and short forms. Long-form homologs have a putative ClpP-class serine protease domain while the short form homologs do not. Downstream from the ClpP-class domain is the so-called NfeD or DUF107 domain. N-terminal region of the NfeD homolog PH1510 from Pyrococcus horikoshii has been shown to possess serine protease activity having a Ser-Lys catalytic dyad. Pssm-ID: 132923 [Multi-domain] Cd Length: 161 Bit Score: 53.17 E-value: 1.03e-08
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| SppA | COG0616 | Periplasmic serine protease, ClpP class [Posttranslational modification, protein turnover, ... |
75-151 | 3.83e-08 | |||||
Periplasmic serine protease, ClpP class [Posttranslational modification, protein turnover, chaperones]; Pssm-ID: 440381 [Multi-domain] Cd Length: 215 Bit Score: 52.49 E-value: 3.83e-08
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| S49_Sppa_N_C | cd07023 | Signal peptide peptidase A (SppA), a serine protease, has catalytic Ser-Lys dyad; Signal ... |
75-151 | 7.67e-08 | |||||
Signal peptide peptidase A (SppA), a serine protease, has catalytic Ser-Lys dyad; Signal peptide peptidase A (SppA; Peptidase S49; Protease IV): SppA is found in all three domains of life and is involved in the cleavage of signal peptides after their removal from the precursor proteins by signal peptidases. This subfamily contains members with either a single domain (sometimes referred to as 36K type), such as sohB peptidase, protein C and archaeal signal peptide peptidase, or an amino-terminal domain in addition to the carboxyl-terminal protease domain that is conserved in all the S49 family members (sometimes referred to as 67K type), similar to E. coli and Arabidopsis thaliana SppA peptidases. Site-directed mutagenesis and sequence analysis have shown these SppAs to be serine proteases. The predicted active site serine for members in this family occurs in a transmembrane domain. Mutagenesis studies also suggest that the catalytic center comprises a Ser-Lys dyad and not the usual Ser-His-Asp catalytic triad found in the majority of serine proteases. Interestingly, the single membrane spanning E. coli SppA carries out catalysis using a Ser-Lys dyad with the serine located in the conserved carboxy-terminal protease domain and the lysine in the non-conserved amino-terminal domain. Pssm-ID: 132934 [Multi-domain] Cd Length: 208 Bit Score: 51.72 E-value: 7.67e-08
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| SppA_67K | TIGR00705 | signal peptide peptidase SppA, 67K type; This model represents the signal peptide peptidase A ... |
78-153 | 2.47e-07 | |||||
signal peptide peptidase SppA, 67K type; This model represents the signal peptide peptidase A (SppA, protease IV) as found in E. coli, Treponema pallidum, Mycobacterium leprae, and several other species, in which it has a molecular mass around 67 kDa and a duplication such that the N-terminal half shares extensive homology with the C-terminal half. This enzyme was shown in E. coli to form homotetramers. E. coli SohB, which is most closely homologous to the C-terminal duplication of SppA, is predicted to perform a similar function of small peptide degradation, but in the periplasm. Many prokaryotes have a single SppA/SohB homolog that may perform the function of either or both. [Protein fate, Degradation of proteins, peptides, and glycopeptides] Pssm-ID: 273226 [Multi-domain] Cd Length: 584 Bit Score: 51.37 E-value: 2.47e-07
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| Clp_protease_NfeD_1 | cd07020 | Nodulation formation efficiency D (NfeD) is a membrane-bound ClpP-class protease; Nodulation ... |
76-172 | 1.17e-06 | |||||
Nodulation formation efficiency D (NfeD) is a membrane-bound ClpP-class protease; Nodulation formation efficiency D (NfeD; stomatin operon partner protein, STOPP; DUF107) is a member of membrane-anchored ClpP-class proteases. Currently, more than 300 NfeD homologs have been identified - all of which are bacterial or archaeal in origin. Majority of these genomes have been shown to possess operons containing a homologous NfeD/stomatin gene pair, causing NfeD to be previously named STOPP (stomatin operon partner protein). NfeD homologs can be divided into two groups: long and short forms. Long-form homologs have a putative ClpP-class serine protease domain while the short form homologs do not. Downstream from the ClpP-class domain is the so-called NfeD or DUF107 domain. N-terminal region of the NfeD homolog PH1510 (1510-N or PH1510-N) from Pyrococcus horikoshii has been shown to possess serine protease activity and has a Ser-Lys catalytic dyad, preferentially cleaving hydrophobic substrates. Difference in oligomeric form and catalytic residues between 1510-N (forming a dimer) and ClpP (forming a tetradecamer) shows a possible functional difference: 1510-N is likely to have a regulatory function while ClpP is involved in protein quality control. Pssm-ID: 132931 [Multi-domain] Cd Length: 187 Bit Score: 47.93 E-value: 1.17e-06
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| SppA_dom | TIGR00706 | signal peptide peptidase SppA, 36K type; The related but duplicated, double-length protein ... |
65-151 | 4.30e-06 | |||||
signal peptide peptidase SppA, 36K type; The related but duplicated, double-length protein SppA (protease IV) of E. coli was shown experimentally to degrade signal peptides as are released by protein processing and secretion. This protein shows stronger homology to the C-terminal region of SppA than to the N-terminal domain or to the related putative protease SuhB. The member of this family from Bacillus subtilis was shown to have properties consistent with a role in degrading signal peptides after cleavage from precursor proteins, although it was not demonstrated conclusively. [Protein fate, Degradation of proteins, peptides, and glycopeptides] Pssm-ID: 273227 [Multi-domain] Cd Length: 208 Bit Score: 46.59 E-value: 4.30e-06
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| Clp_protease_NfeD | cd07015 | Nodulation formation efficiency D (NfeD) is a membrane-bound ClpP-class protease; Nodulation ... |
65-168 | 4.37e-06 | |||||
Nodulation formation efficiency D (NfeD) is a membrane-bound ClpP-class protease; Nodulation formation efficiency D (NfeD; stomatin operon partner protein, STOPP; DUF107) is a member of membrane-anchored ClpP-class proteases. Currently, more than 300 NfeD homologs have been identified - all of which are bacterial or archaeal in origin. Majority of these genomes have been shown to possess operons containing a homologous NfeD/stomatin gene pair, causing NfeD to be previously named STOPP (stomatin operon partner protein). NfeD homologs can be divided into two groups: long and short forms. Long-form homologs have a putative ClpP-class serine protease domain while the short form homologs do not. Downstream from the ClpP-class domain is the so-called NfeD or DUF107 domain. N-terminal region of the NfeD homolog PH1510 (1510-N or PH1510-N) from Pyrococcus horikoshii has been shown to possess serine protease activity and has a Ser-Lys catalytic dyad, preferentially cleaving hydrophobic substrates. Difference in oligomeric form and catalytic residues between 1510-N (forming a dimer) and ClpP (forming a tetradecamer) shows a possible functional difference: 1510-N is likely to have a regulatory function while ClpP is involved in protein quality control. Pssm-ID: 132926 Cd Length: 172 Bit Score: 45.85 E-value: 4.37e-06
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| ClpP | COG0740 | ATP-dependent protease ClpP, protease subunit [Posttranslational modification, protein ... |
80-141 | 2.33e-05 | |||||
ATP-dependent protease ClpP, protease subunit [Posttranslational modification, protein turnover, chaperones]; Pssm-ID: 440503 Cd Length: 194 Bit Score: 44.31 E-value: 2.33e-05
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| CLP_protease | pfam00574 | Clp protease; The Clp protease has an active site catalytic triad. In E. coli Clp protease, ... |
88-141 | 1.73e-04 | |||||
Clp protease; The Clp protease has an active site catalytic triad. In E. coli Clp protease, ser-111, his-136 and asp-185 form the catalytic triad. Swiss:P48254 has lost all of these active site residues and is therefore inactive. Swiss:P42379 contains two large insertions, Swiss:P42380 contains one large insertion. Pssm-ID: 425759 [Multi-domain] Cd Length: 181 Bit Score: 41.40 E-value: 1.73e-04
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| crotonase-like | cd06558 | Crotonase/Enoyl-Coenzyme A (CoA) hydratase superfamily. This superfamily contains a diverse ... |
127-249 | 1.82e-04 | |||||
Crotonase/Enoyl-Coenzyme A (CoA) hydratase superfamily. This superfamily contains a diverse set of enzymes including enoyl-CoA hydratase, napthoate synthase, methylmalonyl-CoA decarboxylase, 3-hydoxybutyryl-CoA dehydratase, and dienoyl-CoA isomerase. Many of these play important roles in fatty acid metabolism. In addition to a conserved structural core and the formation of trimers (or dimers of trimers), a common feature in this superfamily is the stabilization of an enolate anion intermediate derived from an acyl-CoA substrate. This is accomplished by two conserved backbone NH groups in active sites that form an oxyanion hole. Pssm-ID: 119339 [Multi-domain] Cd Length: 195 Bit Score: 41.39 E-value: 1.82e-04
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| S14_ClpP | cd07013 | Caseinolytic protease (ClpP) is an ATP-dependent, highly conserved serine protease; Clp ... |
80-141 | 2.00e-04 | |||||
Caseinolytic protease (ClpP) is an ATP-dependent, highly conserved serine protease; Clp protease (caseinolytic protease; ClpP; Peptidase S14) is a highly conserved serine protease present throughout in bacteria and eukaryota, but seems to be absent in archaea, mollicutes and some fungi. Clp proteases are involved in a number of cellular processes such as degradation of misfolded proteins, regulation of short-lived proteins and housekeeping removal of dysfunctional proteins. Additionally, they are implicated in the control of cell growth, targeting DNA-binding protein from starved cells. ClpP has also been linked to the tight regulation of virulence genes in the pathogens Listeria monocytogenes and Salmonella typhimurium. This enzyme belong to the family of ATP-dependent proteases; the functional Clp protease is comprised of two components: a proteolytic component and one of several regulatory ATPase components, both of which are required for effective levels of protease activity in the presence of ATP, although the proteolytic subunit alone does possess some catalytic activity. Active site consists of the triad Ser, His and Asp; some members have lost all of these active site residues and are therefore inactive, while others may have one or two large insertions. ClpP seems to prefer hydrophobic or non-polar residues at P1 or P1' positions in its substrate. The protease exists as a tetradecamer made up of two heptameric rings stacked back-to-back such that the catalytic triad of each subunit is located at the interface between three monomers, thus making oligomerization essential for function. Pssm-ID: 132924 [Multi-domain] Cd Length: 162 Bit Score: 41.10 E-value: 2.00e-04
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| COG3904 | COG3904 | Predicted periplasmic protein [Function unknown]; |
71-151 | 8.31e-04 | |||||
Predicted periplasmic protein [Function unknown]; Pssm-ID: 443110 [Multi-domain] Cd Length: 197 Bit Score: 39.63 E-value: 8.31e-04
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| ECH_1 | pfam00378 | Enoyl-CoA hydratase/isomerase; This family contains a diverse set of enzymes including: ... |
127-162 | 4.54e-03 | |||||
Enoyl-CoA hydratase/isomerase; This family contains a diverse set of enzymes including: enoyl-CoA hydratase, napthoate synthase, carnitate racemase, 3-hydroxybutyryl-CoA dehydratase and dodecanoyl-CoA delta-isomerase. Pssm-ID: 395302 [Multi-domain] Cd Length: 251 Bit Score: 37.72 E-value: 4.54e-03
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| KR_1_FAS_SDR_x | cd08954 | beta-ketoacyl reductase (KR) domain of fatty acid synthase (FAS), subgroup 1, complex (x) SDRs; ... |
31-115 | 4.99e-03 | |||||
beta-ketoacyl reductase (KR) domain of fatty acid synthase (FAS), subgroup 1, complex (x) SDRs; NADP-dependent KR domain of the multidomain type I FAS, a complex SDR family. This subfamily also includes proteins identified as polyketide synthase (PKS), a protein with related modular protein architecture and similar function. It includes the KR domains of mammalian and chicken FAS, and Dictyostelium discoideum putative polyketide synthases (PKSs). These KR domains contain two subdomains, each of which is related to SDR Rossmann fold domains. However, while the C-terminal subdomain has an active site similar to the other SDRs and a NADP-binding capability, the N-terminal SDR-like subdomain is truncated and lacks these functions, serving a supportive structural role. In some instances, such as porcine FAS, an enoyl reductase (a Rossman fold NAD-binding domain of the medium-chain dehydrogenase/reductase, MDR family) module is inserted between the sub-domains. Fatty acid synthesis occurs via the stepwise elongation of a chain (which is attached to acyl carrier protein, ACP) with 2-carbon units. Eukaryotic systems consists of large, multifunctional synthases (type I) while bacterial, type II systems, use single function proteins. Fungal fatty acid synthesis uses a dodecamer of 6 alpha and 6 beta subunits. In mammalian type FAS cycles, ketoacyl synthase forms acetoacetyl-ACP which is reduced by the NADP-dependent beta-ketoacyl reductase (KR), forming beta-hydroxyacyl-ACP, which is in turn dehydrated by dehydratase to a beta-enoyl intermediate, which is reduced by NADP-dependent beta-enoyl reductase (ER); this KR and ER are members of the SDR family. This KR subfamily has an active site tetrad with a similar 3D orientation compared to archetypical SDRs, but the active site Lys and Asn residue positions are swapped. The characteristic NADP-binding is typical of the multidomain complex SDRs, with a GGXGXXG NADP binding motif. SDRs are a functionally diverse family of oxidoreductases that have a single domain with a structurally conserved Rossmann fold (alpha/beta folding pattern with a central beta-sheet), an NAD(P)(H)-binding region, and a structurally diverse C-terminal region. Classical SDRs are typically about 250 residues long, while extended SDRs are approximately 350 residues. Sequence identity between different SDR enzymes are typically in the 15-30% range, but the enzymes share the Rossmann fold NAD-binding motif and characteristic NAD-binding and catalytic sequence patterns. These enzymes catalyze a wide range of activities including the metabolism of steroids, cofactors, carbohydrates, lipids, aromatic compounds, and amino acids, and act in redox sensing. Classical SDRs have an TGXXX[AG]XG cofactor binding motif and a YXXXK active site motif, with the Tyr residue of the active site motif serving as a critical catalytic residue (Tyr-151, human prostaglandin dehydrogenase (PGDH) numbering). In addition to the Tyr and Lys, there is often an upstream Ser (Ser-138, PGDH numbering) and/or an Asn (Asn-107, PGDH numbering) contributing to the active site; while substrate binding is in the C-terminal region, which determines specificity. The standard reaction mechanism is a 4-pro-S hydride transfer and proton relay involving the conserved Tyr and Lys, a water molecule stabilized by Asn, and nicotinamide. Extended SDRs have additional elements in the C-terminal region, and typically have a TGXXGXXG cofactor binding motif. Complex (multidomain) SDRs such as ketoreductase domains of fatty acid synthase have a GGXGXXG NAD(P)-binding motif and an altered active site motif (YXXXN). Fungal type KRs have a TGXXXGX(1-2)G NAD(P)-binding motif. Some atypical SDRs have lost catalytic activity and/or have an unusual NAD(P)-binding motif and missing or unusual active site residues. Reactions catalyzed within the SDR family include isomerization, decarboxylation, epimerization, C=N bond reduction, dehydratase activity, dehalogenation, Enoyl-CoA reduction, and carbonyl-alcohol oxidoreduction. Pssm-ID: 187657 [Multi-domain] Cd Length: 452 Bit Score: 38.20 E-value: 4.99e-03
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| S49_Sppa_36K_type | cd07022 | Signal peptide peptidase A (SppA) 36K type, a serine protease, has catalytic Ser-Lys dyad; ... |
77-151 | 7.28e-03 | |||||
Signal peptide peptidase A (SppA) 36K type, a serine protease, has catalytic Ser-Lys dyad; Signal peptide peptidase A (SppA; Peptidase S49; Protease IV) 36K type: SppA is found in all three domains of life and is involved in the cleavage of signal peptides after their removal from the precursor proteins by signal peptidases. Members in this subfamily are all bacterial and include sohB peptidase and protein C. These are sometimes referred to as 36K type since they contain only one domain, unlike E. coli SppA that also contains an amino-terminal domain. Site-directed mutagenesis and sequence analysis have shown these SppAs to be serine proteases. The predicted active site serine for members in this family occurs in a transmembrane domain. Mutagenesis studies also suggest that the catalytic center comprises a Ser-Lys dyad and not the usual Ser-His-Asp catalytic triad found in the majority of serine proteases. Pssm-ID: 132933 [Multi-domain] Cd Length: 214 Bit Score: 36.77 E-value: 7.28e-03
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