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Conserved domains on  [gi|1186517968|ref|NP_001337889|]
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mitochondrial inner membrane protease subunit 2 isoform a [Homo sapiens]

Protein Classification

S26 family signal peptidase( domain architecture ID 1000376)

S26 family signal peptidase is a membrane-bound serine protease which frees proteins tethered to inner or mitochondrial membranes by cleaving off signal peptides during polypeptide translocation

CATH:  2.10.109.10
EC:  3.4.21.-
Gene Ontology:  GO:0006465|GO:0004252
PubMed:  7845208|12475201

Graphical summary

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List of domain hits

 Name Accession Description Interval E-value
sigpep_I_bact super family cl37079
signal peptidase I, bacterial type; This model represents signal peptidase I from most ...
 33-152 7.65e-23

signal peptidase I, bacterial type; This model represents signal peptidase I from most bacteria. Eukaryotic sequences are likely organellar. Several bacteria have multiple paralogs, but these represent isozymes of signal peptidase I. Virtually all known bacteria may be presumed to A related model finds a simlar protein in many archaea and a few bacteria, as well as a microsomal (endoplasmic reticulum) protein in eukaryotes. [Protein fate, Protein and peptide secretion and trafficking]


The actual alignment was detected with superfamily member TIGR02227:

Pssm-ID: 274044 [Multi-domain]  Cd Length: 142  Bit Score: 88.44  E-value: 7.65e-23
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1186517968  33 VACVARVEGASMQPSLNPGgsqssDVVLLNHWKVRNFEVHRGDIVSLVSPKNPEQKIIKRVIALEGDIVRTI-------G 105
Cdd:TIGR02227   2 VFFPYKIPGGSMEPTLKEG-----DRILVNKFAYRTSDPKRGDIVVFKDPDTNKNIYVKRIIGLPGDKVEFRdgklyinG 76

                          90       100       110       120       130       140
                  ....*....|....*....|....*....|....*....|....*....|....*....|....
gi 1186517968 106 HK-----------------NRYVKVPRGHIWVEGDHHGHSFDSNSFGPVSLGLLHAHATHILWP 152
Cdd:TIGR02227  77 KKidepylkpngyldtsefNTPVKVPPGHYFVLGDNRDNSLDSRYFGFVPIDQIIGKVSFVFYP 140
 
Name Accession Description Interval E-value
sigpep_I_bact TIGR02227
signal peptidase I, bacterial type; This model represents signal peptidase I from most ...
 33-152 7.65e-23

signal peptidase I, bacterial type; This model represents signal peptidase I from most bacteria. Eukaryotic sequences are likely organellar. Several bacteria have multiple paralogs, but these represent isozymes of signal peptidase I. Virtually all known bacteria may be presumed to A related model finds a simlar protein in many archaea and a few bacteria, as well as a microsomal (endoplasmic reticulum) protein in eukaryotes. [Protein fate, Protein and peptide secretion and trafficking]


Pssm-ID: 274044 [Multi-domain]  Cd Length: 142  Bit Score: 88.44  E-value: 7.65e-23
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1186517968  33 VACVARVEGASMQPSLNPGgsqssDVVLLNHWKVRNFEVHRGDIVSLVSPKNPEQKIIKRVIALEGDIVRTI-------G 105
Cdd:TIGR02227   2 VFFPYKIPGGSMEPTLKEG-----DRILVNKFAYRTSDPKRGDIVVFKDPDTNKNIYVKRIIGLPGDKVEFRdgklyinG 76

                          90       100       110       120       130       140
                  ....*....|....*....|....*....|....*....|....*....|....*....|....
gi 1186517968 106 HK-----------------NRYVKVPRGHIWVEGDHHGHSFDSNSFGPVSLGLLHAHATHILWP 152
Cdd:TIGR02227  77 KKidepylkpngyldtsefNTPVKVPPGHYFVLGDNRDNSLDSRYFGFVPIDQIIGKVSFVFYP 140
S26_SPase_I cd06530
The S26 Type I signal peptidase (SPase; LepB; leader peptidase B; leader peptidase I; EC 3.4. ...
 36-146 1.08e-22

The S26 Type I signal peptidase (SPase; LepB; leader peptidase B; leader peptidase I; EC 3.4.21.89) family members are essential membrane-bound serine proteases that function to cleave the amino-terminal signal peptide extension from proteins that are translocated across biological membranes. The bacterial signal peptidase I, which is the most intensively studied, has two N-terminal transmembrane segments inserted in the plasma membrane and a hydrophilic, C-terminal catalytic region that is located in the periplasmic space. Although the bacterial signal peptidase I is monomeric, signal peptidases of eukaryotic cells commonly function as oligomeric complexes containing two divergent copies of the catalytic monomer. These are the IMP1 and IMP2 signal peptidases of the mitochondrial inner membrane that remove leader peptides from nuclear- and mitochondrial-encoded proteins. Also, two components of the endoplasmic reticulum signal peptidase in mammals (18-kDa and 21-kDa) belong to this family and they process many proteins that enter the ER for retention or for export to the Golgi apparatus, secretory vesicles, plasma membranes or vacuole. An atypical member of the S26 SPase type I family is the TraF peptidase which has the remarkable activity of producing a cyclic protein of the Pseudomonas pilin system. The type I signal peptidases are unique serine proteases that utilize a serine/lysine catalytic dyad mechanism in place of the classical serine/histidine/aspartic acid catalytic triad mechanism.


Pssm-ID: 119398 [Multi-domain]  Cd Length: 85  Bit Score: 86.10  E-value: 1.08e-22
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1186517968  36 VARVEGASMQPSLNPGgsqssDVVLLNHWKVRNFEVHRGDIVSLVSPKNPEQKIIKRVIAlegdivrtighknryvkvpr 115
Cdd:cd06530     2 PVVVPGGSMEPTLQPG-----DLVLVNKLSYGFREPKRGDVVVFKSPGDPGKPIIKRVIG-------------------- 56

                          90       100       110
                  ....*....|....*....|....*....|.
gi 1186517968 116 ghIWVEGDHHGHSFDSNSFGPVSLGLLHAHA 146
Cdd:cd06530    57 --YFVLGDNRNNSLDSRYWGPVPEDDIVGKV 85
Peptidase_S26 pfam10502
Signal peptidase, peptidase S26; This is a family of membrane signal serine endopeptidases ...
 9-151 2.65e-22

Signal peptidase, peptidase S26; This is a family of membrane signal serine endopeptidases which function in the processing of newly-synthesized secreted proteins. Peptidase S26 removes the hydrophobic, N-terminal, signal peptides as proteins are translocated across membranes. The active site residues take the form of a catalytic dyad that is Ser, Lys in subfamily S26A; the Ser is the nucleophile in catalysis, and the Lys is the general base.


Pssm-ID: 431321 [Multi-domain]  Cd Length: 162  Bit Score: 87.65  E-value: 2.65e-22
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1186517968   9 KRYIKAFckgfFVAVPVAVTFldRVACVA--RVEGASMQPSLNPGgsqssDVVLLNHWKVRNFEVHRGDIVSLVSPKNPE 86
Cdd:pfam10502   2 LEWVKAI----VIALLLALLI--RTFLFEpyVVPGGSMSPTLPIG-----DYLIVNKFSYGLGEPKRGDIVVFRPPEGPG 70

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1186517968  87 QKIIKRVIALEGDIVR---------------------------TIGHKNRYVKVPRGHIWVEGDHHGHSFDSNSFGPVSL 139
Cdd:pfam10502  71 VPLIKRVIGLPGDRVEykddqlyingkpvgepyladrkgrptfDLPPWQGCRVVPEGEYFVMGDNRDNSLDSRYFGFVPA 150

                         170
                  ....*....|..
gi 1186517968 140 GLLHAHATHILW 151
Cdd:pfam10502 151 SNIVGRAVFPVW 162
LepB COG0681
Signal peptidase I [Intracellular trafficking, secretion, and vesicular transport];
1-140 3.22e-16

Signal peptidase I [Intracellular trafficking, secretion, and vesicular transport];


Pssm-ID: 440445 [Multi-domain]  Cd Length: 189  Bit Score: 72.19  E-value: 3.22e-16
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1186517968   1 MAQSQGWvKRYIKAFCKGFFVAVPVAV---TFldrVACVARVEGASMQPSLNPGgsqssDVVLLNHWKVRNFEVHRGDIV 77
Cdd:COG0681     1 MSKKKKK-KRELREWLKSIVIALLLALlirTF---VFEPFVIPSGSMEPTLLVG-----DRLLVNKLSYGFGEPKRGDIV 71

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1186517968  78 SLVSPKNPEQKIIKRVIALEGDIVR----------------------TIGHKNRYVKVPRGHIWVEGDHHGHSFDSNSFG 135
Cdd:COG0681    72 VFKYPEDPSKDYIKRVIGLPGDTVEirdgqvyvngkplnepyleeyyYPVSVDGDVEVPPGEEEVPGGGGDNSNDSRSGD 151


                  ....*
gi 1186517968 136 PVSLG 140
Cdd:COG0681   152 PDDGG 156
PRK10861 PRK10861
signal peptidase I;
73-102 3.45e-03

signal peptidase I;


Pssm-ID: 182787 [Multi-domain]  Cd Length: 324  Bit Score: 36.96  E-value: 3.45e-03
                          10        20        30
                  ....*....|....*....|....*....|
gi 1186517968  73 RGDIVSLVSPKNPEQKIIKRVIALEGDIVR 102
Cdd:PRK10861  128 RGDIVVFKYPEDPKLDYIKRVVGLPGDKVT 157
 
Name Accession Description Interval E-value
sigpep_I_bact TIGR02227
signal peptidase I, bacterial type; This model represents signal peptidase I from most ...
 33-152 7.65e-23

signal peptidase I, bacterial type; This model represents signal peptidase I from most bacteria. Eukaryotic sequences are likely organellar. Several bacteria have multiple paralogs, but these represent isozymes of signal peptidase I. Virtually all known bacteria may be presumed to A related model finds a simlar protein in many archaea and a few bacteria, as well as a microsomal (endoplasmic reticulum) protein in eukaryotes. [Protein fate, Protein and peptide secretion and trafficking]


Pssm-ID: 274044 [Multi-domain]  Cd Length: 142  Bit Score: 88.44  E-value: 7.65e-23
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1186517968  33 VACVARVEGASMQPSLNPGgsqssDVVLLNHWKVRNFEVHRGDIVSLVSPKNPEQKIIKRVIALEGDIVRTI-------G 105
Cdd:TIGR02227   2 VFFPYKIPGGSMEPTLKEG-----DRILVNKFAYRTSDPKRGDIVVFKDPDTNKNIYVKRIIGLPGDKVEFRdgklyinG 76

                          90       100       110       120       130       140
                  ....*....|....*....|....*....|....*....|....*....|....*....|....
gi 1186517968 106 HK-----------------NRYVKVPRGHIWVEGDHHGHSFDSNSFGPVSLGLLHAHATHILWP 152
Cdd:TIGR02227  77 KKidepylkpngyldtsefNTPVKVPPGHYFVLGDNRDNSLDSRYFGFVPIDQIIGKVSFVFYP 140
S26_SPase_I cd06530
The S26 Type I signal peptidase (SPase; LepB; leader peptidase B; leader peptidase I; EC 3.4. ...
 36-146 1.08e-22

The S26 Type I signal peptidase (SPase; LepB; leader peptidase B; leader peptidase I; EC 3.4.21.89) family members are essential membrane-bound serine proteases that function to cleave the amino-terminal signal peptide extension from proteins that are translocated across biological membranes. The bacterial signal peptidase I, which is the most intensively studied, has two N-terminal transmembrane segments inserted in the plasma membrane and a hydrophilic, C-terminal catalytic region that is located in the periplasmic space. Although the bacterial signal peptidase I is monomeric, signal peptidases of eukaryotic cells commonly function as oligomeric complexes containing two divergent copies of the catalytic monomer. These are the IMP1 and IMP2 signal peptidases of the mitochondrial inner membrane that remove leader peptides from nuclear- and mitochondrial-encoded proteins. Also, two components of the endoplasmic reticulum signal peptidase in mammals (18-kDa and 21-kDa) belong to this family and they process many proteins that enter the ER for retention or for export to the Golgi apparatus, secretory vesicles, plasma membranes or vacuole. An atypical member of the S26 SPase type I family is the TraF peptidase which has the remarkable activity of producing a cyclic protein of the Pseudomonas pilin system. The type I signal peptidases are unique serine proteases that utilize a serine/lysine catalytic dyad mechanism in place of the classical serine/histidine/aspartic acid catalytic triad mechanism.


Pssm-ID: 119398 [Multi-domain]  Cd Length: 85  Bit Score: 86.10  E-value: 1.08e-22
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1186517968  36 VARVEGASMQPSLNPGgsqssDVVLLNHWKVRNFEVHRGDIVSLVSPKNPEQKIIKRVIAlegdivrtighknryvkvpr 115
Cdd:cd06530     2 PVVVPGGSMEPTLQPG-----DLVLVNKLSYGFREPKRGDVVVFKSPGDPGKPIIKRVIG-------------------- 56

                          90       100       110
                  ....*....|....*....|....*....|.
gi 1186517968 116 ghIWVEGDHHGHSFDSNSFGPVSLGLLHAHA 146
Cdd:cd06530    57 --YFVLGDNRNNSLDSRYWGPVPEDDIVGKV 85
Peptidase_S26 pfam10502
Signal peptidase, peptidase S26; This is a family of membrane signal serine endopeptidases ...
 9-151 2.65e-22

Signal peptidase, peptidase S26; This is a family of membrane signal serine endopeptidases which function in the processing of newly-synthesized secreted proteins. Peptidase S26 removes the hydrophobic, N-terminal, signal peptides as proteins are translocated across membranes. The active site residues take the form of a catalytic dyad that is Ser, Lys in subfamily S26A; the Ser is the nucleophile in catalysis, and the Lys is the general base.


Pssm-ID: 431321 [Multi-domain]  Cd Length: 162  Bit Score: 87.65  E-value: 2.65e-22
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1186517968   9 KRYIKAFckgfFVAVPVAVTFldRVACVA--RVEGASMQPSLNPGgsqssDVVLLNHWKVRNFEVHRGDIVSLVSPKNPE 86
Cdd:pfam10502   2 LEWVKAI----VIALLLALLI--RTFLFEpyVVPGGSMSPTLPIG-----DYLIVNKFSYGLGEPKRGDIVVFRPPEGPG 70

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1186517968  87 QKIIKRVIALEGDIVR---------------------------TIGHKNRYVKVPRGHIWVEGDHHGHSFDSNSFGPVSL 139
Cdd:pfam10502  71 VPLIKRVIGLPGDRVEykddqlyingkpvgepyladrkgrptfDLPPWQGCRVVPEGEYFVMGDNRDNSLDSRYFGFVPA 150

                         170
                  ....*....|..
gi 1186517968 140 GLLHAHATHILW 151
Cdd:pfam10502 151 SNIVGRAVFPVW 162
LepB COG0681
Signal peptidase I [Intracellular trafficking, secretion, and vesicular transport];
1-140 3.22e-16

Signal peptidase I [Intracellular trafficking, secretion, and vesicular transport];


Pssm-ID: 440445 [Multi-domain]  Cd Length: 189  Bit Score: 72.19  E-value: 3.22e-16
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1186517968   1 MAQSQGWvKRYIKAFCKGFFVAVPVAV---TFldrVACVARVEGASMQPSLNPGgsqssDVVLLNHWKVRNFEVHRGDIV 77
Cdd:COG0681     1 MSKKKKK-KRELREWLKSIVIALLLALlirTF---VFEPFVIPSGSMEPTLLVG-----DRLLVNKLSYGFGEPKRGDIV 71

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1186517968  78 SLVSPKNPEQKIIKRVIALEGDIVR----------------------TIGHKNRYVKVPRGHIWVEGDHHGHSFDSNSFG 135
Cdd:COG0681    72 VFKYPEDPSKDYIKRVIGLPGDTVEirdgqvyvngkplnepyleeyyYPVSVDGDVEVPPGEEEVPGGGGDNSNDSRSGD 151


                  ....*
gi 1186517968 136 PVSLG 140
Cdd:COG0681   152 PDDGG 156
Peptidase_S24_S26 cd06462
The S24, S26 LexA/signal peptidase superfamily contains LexA-related and type I signal ...
 36-136 8.64e-12

The S24, S26 LexA/signal peptidase superfamily contains LexA-related and type I signal peptidase families. The S24 LexA protein domains include: the lambda repressor CI/C2 family and related bacterial prophage repressor proteins; LexA (EC 3.4.21.88), the repressor of genes in the cellular SOS response to DNA damage; MucA and the related UmuD proteins, which are lesion-bypass DNA polymerases, induced in response to mitogenic DNA damage; RulA, a component of the rulAB locus that confers resistance to UV, and RuvA, which is a component of the RuvABC resolvasome that catalyzes the resolution of Holliday junctions that arise during genetic recombination and DNA repair. The S26 type I signal peptidase (SPase) family also includes mitochondrial inner membrane protease (IMP)-like members. SPases are essential membrane-bound proteases which function to cleave away the amino-terminal signal peptide from the translocated pre-protein, thus playing a crucial role in the transport of proteins across membranes in all living organisms. All members in this superfamily are unique serine proteases that carry out catalysis using a serine/lysine dyad instead of the prototypical serine/histidine/aspartic acid triad found in most serine proteases.


Pssm-ID: 119396 [Multi-domain]  Cd Length: 84  Bit Score: 58.04  E-value: 8.64e-12
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1186517968  36 VARVEGASMQPSLNPGgsqssDVVLLNHWKvrnFEVHRGDIVSLVSPKNpeQKIIKRVIALEGDivrtighknryvkvpr 115
Cdd:cd06462     2 ALRVEGDSMEPTIPDG-----DLVLVDKSS---YEPKRGDIVVFRLPGG--ELTVKRVIGLPGE---------------- 55

                          90       100
                  ....*....|....*....|.
gi 1186517968 116 GHIWVEGDHHgHSFDSNSFGP 136
Cdd:cd06462    56 GHYFLLGDNP-NSPDSRIDGP 75
TraF COG4959
Type IV secretory pathway, protease TraF [Posttranslational modification, protein turnover, ...
 73-152 1.95e-11

Type IV secretory pathway, protease TraF [Posttranslational modification, protein turnover, chaperones, Intracellular trafficking, secretion, and vesicular transport];


Pssm-ID: 443985 [Multi-domain]  Cd Length: 114  Bit Score: 58.00  E-value: 1.95e-11
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1186517968  73 RGDIVSLVSPKN---------PEQKIIKRVIALEGDIVRTIGHK----NRYV--------------------KVPRGHIW 119
Cdd:COG4959     1 RGDLVAFRPPEPlaaergylpRGVPLIKRVAALPGDTVCIKGGQvyinGKPVaealerdragrplpvwqgcgVVPEGEYF 80

                          90       100       110
                  ....*....|....*....|....*....|...
gi 1186517968 120 VEGDHHGHSFDSNSFGPVSLGLLHAHATHILWP 152
Cdd:COG4959    81 LLGDNRPNSFDSRYFGPVPRSQIIGRAVPLWTP 113
sod_Ni_protease TIGR02754
nickel-type superoxide dismutase maturation protease; Members of this protein family are ...
 37-142 8.11e-10

nickel-type superoxide dismutase maturation protease; Members of this protein family are apparent proteases encoded adjacent to the genes for a nickel-type superoxide dismutase. This family belongs to the same larger family (see pfam00717) as signal peptidase I, an unusual serine protease suggested to have a Ser/Lys catalytic dyad. [Cellular processes, Detoxification, Protein fate, Protein modification and repair]


Pssm-ID: 274282 [Multi-domain]  Cd Length: 90  Bit Score: 53.23  E-value: 8.11e-10
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1186517968  37 ARVEGASMQPSLNPGgsqssDVVLLNHWkVRNFEV-HRGDIVSLVSPKNPEQKIIKRVIAlegdivrtighknryvkVPR 115
Cdd:TIGR02754   1 AKVTGVSMSPTLPPG-----DRIIVVPW-LKIFRVpPIGNVVVVRHPLQPYGLIIKRLAA-----------------VDD 57

                          90       100
                  ....*....|....*....|....*..
gi 1186517968 116 GHIWVEGDHHGHSFDSNSFGPVSLGLL 142
Cdd:TIGR02754  58 NGLFLLGDNPKASTDSRQLGPVPRSLL 84
TraF_Ti TIGR02771
conjugative transfer signal peptidase TraF; This protein is found in apparent operons encoding ...
 70-138 3.01e-03

conjugative transfer signal peptidase TraF; This protein is found in apparent operons encoding elements of conjugative transfer systems. This family is homologous to a broader family of signal (leader) peptidases such as lepB. This family is present in both Ti-type and I-type conjugative systems.


Pssm-ID: 131818 [Multi-domain]  Cd Length: 171  Bit Score: 36.69  E-value: 3.01e-03
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1186517968  70 EVHRGDIVSLVSPKNP-------------------EQKIIKRVIALEGD-------IVRTIGHKNRYVK----------- 112
Cdd:TIGR02771  46 PVERGDYVVFCPPDNPqfeearergylreglcpggFGPLLKRVLGLPGDrvtvradVVAINGQLLPYSKplatdssgrpl 125

                          90       100       110
                  ....*....|....*....|....*....|...
gi 1186517968 113 -------VPRGHIWVEgDHHGHSFDSNSFGPVS 138
Cdd:TIGR02771 126 ppfpegvIPPGFFVVH-DTSPTSFDSRYFGPIS 157
PRK10861 PRK10861
signal peptidase I;
73-102 3.45e-03

signal peptidase I;


Pssm-ID: 182787 [Multi-domain]  Cd Length: 324  Bit Score: 36.96  E-value: 3.45e-03
                          10        20        30
                  ....*....|....*....|....*....|
gi 1186517968  73 RGDIVSLVSPKNPEQKIIKRVIALEGDIVR 102
Cdd:PRK10861  128 RGDIVVFKYPEDPKLDYIKRVVGLPGDKVT 157
 
Blast search parameters
Data Source: Precalculated data, version = cdd.v.3.21
Preset Options:Database: CDSEARCH/cdd   Low complexity filter: no  Composition Based Adjustment: yes   E-value threshold: 0.01

References:

  • Wang J et al. (2023), "The conserved domain database in 2023", Nucleic Acids Res.51(D)384-8.
  • Lu S et al. (2020), "The conserved domain database in 2020", Nucleic Acids Res.48(D)265-8.
  • Marchler-Bauer A et al. (2017), "CDD/SPARCLE: functional classification of proteins via subfamily domain architectures.", Nucleic Acids Res.45(D)200-3.
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