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MULTISPECIES: LexA family transcriptional regulator [Pseudomonas syringae group]

Protein Classification

LexA family protein( domain architecture ID 11449429)

LexA family protein may function as a transcriptional regulator involved in the repression of one or more genes involved in the response to DNA damage (SOS response), including recA and lexA and/or may contain a S24 peptidase domain such as in the translesion error-prone DNA polymerase V autoproteolytic subunit

Gene Ontology:  GO:0003677|GO:0045892
PubMed:  10679470|10908318

Graphical summary

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List of domain hits

 Name Accession Description Interval E-value
LexA COG1974
SOS-response transcriptional repressor LexA (RecA-mediated autopeptidase) [Transcription, ...
 16-135 3.67e-37

SOS-response transcriptional repressor LexA (RecA-mediated autopeptidase) [Transcription, Signal transduction mechanisms];


:

Pssm-ID: 441577 [Multi-domain]  Cd Length: 199  Bit Score: 125.41  E-value: 3.67e-37
                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 497895467  16 IPFYTfKIPAGFPNPAADHIEQDFSFDRLMDLRAPHIYVAKIDGDSMEGAKIFHDSLVVVDRSRKPSSGSIVIAALNNEP 95
Cdd:COG1974   77 LPLLG-RVAAGFPIPAEENIEEYLDLPEELVKNPGATFALRVKGDSMIDAGILDGDLVIVDRQLEAENGDIVVALIDGEA 155

                         90       100       110       120
                 ....*....|....*....|....*....|....*....|
gi 497895467  96 LCKILILQGDHVVLKSANPAYPPRHIlEGEELSIWGVVRH 135
Cdd:COG1974  156 TVKRLYKEGGRVRLQPENPAYPPIII-EGDDVEILGVVVG 194
 
Name Accession Description Interval E-value
LexA COG1974
SOS-response transcriptional repressor LexA (RecA-mediated autopeptidase) [Transcription, ...
 16-135 3.67e-37

SOS-response transcriptional repressor LexA (RecA-mediated autopeptidase) [Transcription, Signal transduction mechanisms];


Pssm-ID: 441577 [Multi-domain]  Cd Length: 199  Bit Score: 125.41  E-value: 3.67e-37
                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 497895467  16 IPFYTfKIPAGFPNPAADHIEQDFSFDRLMDLRAPHIYVAKIDGDSMEGAKIFHDSLVVVDRSRKPSSGSIVIAALNNEP 95
Cdd:COG1974   77 LPLLG-RVAAGFPIPAEENIEEYLDLPEELVKNPGATFALRVKGDSMIDAGILDGDLVIVDRQLEAENGDIVVALIDGEA 155

                         90       100       110       120
                 ....*....|....*....|....*....|....*....|
gi 497895467  96 LCKILILQGDHVVLKSANPAYPPRHIlEGEELSIWGVVRH 135
Cdd:COG1974  156 TVKRLYKEGGRVRLQPENPAYPPIII-EGDDVEILGVVVG 194
Peptidase_S24 pfam00717
Peptidase S24-like;
17-133 1.61e-33

Peptidase S24-like;


Pssm-ID: 425835  Cd Length: 116  Bit Score: 113.45  E-value: 1.61e-33
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 497895467   17 PFYTfKIPAGFPNPAADHIEQDFSFDRLMDLRAPHIYVAKIDGDSMEgAKIFHDSLVVVDRSRKPSSGSIVIAALNNEPL 96
Cdd:pfam00717   1 PLIG-RVAAGAPILAEEEIEGYLPLPESLLSPPGNLFALRVKGDSME-PGIPDGDLVLVDPSREARNGDIVVARLDGEAT 78

                          90       100       110
                  ....*....|....*....|....*....|....*..
gi 497895467   97 CKILILQGDHVVLKSANPAYPPRHILEGEELSIWGVV 133
Cdd:pfam00717  79 VKRLYRDGGGIRLISLNPEYPPIELPAEDDVEIIGRV 115
PRK10276 PRK10276
translesion error-prone DNA polymerase V autoproteolytic subunit;
8-139 4.18e-25

translesion error-prone DNA polymerase V autoproteolytic subunit;


Pssm-ID: 182350  Cd Length: 139  Bit Score: 92.94  E-value: 4.18e-25
                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 497895467   8 RLCESGKVI--PFYTFKIPAGFPNPAADHIEQDFSFDRLMDLRAPHIYVAKIDGDSMEGAKIFHDSLVVVDRSRKPSSGS 85
Cdd:PRK10276   5 KPAELREIVtfPLFSDLVQCGFPSPAADYVEQRIDLNELLIQHPSATYFVKASGDSMIDAGISDGDLLIVDSAITASHGD 84

                         90       100       110       120       130
                 ....*....|....*....|....*....|....*....|....*....|....
gi 497895467  86 IVIAALNNEPLCKILILQgDHVVLKSANPAYPPRHILEGEELSIWGVVRHGVTS 139
Cdd:PRK10276  85 IVIAAVDGEFTVKKLQLR-PTVQLIPMNSAYSPITISSEDTLDVFGVVTHIVKA 137
S24_LexA-like cd06529
Peptidase S24 LexA-like proteins are involved in the SOS response leading to the repair of ...
 53-133 1.43e-23

Peptidase S24 LexA-like proteins are involved in the SOS response leading to the repair of single-stranded DNA within the bacterial cell. This family includes: 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 LexA-like proteins contain two-domains: an N-terminal DNA binding domain and a C-terminal domain (CTD) that provides LexA dimerization as well as cleavage activity. They undergo autolysis, cleaving at an Ala-Gly or a Cys-Gly bond, separating the DNA-binding domain from the rest of the protein. In the presence of single-stranded DNA, the LexA, UmuD and MucA proteins interact with RecA, activating self cleavage, thus either derepressing transcription in the case of LexA or activating the lesion-bypass polymerase in the case of UmuD and MucA. The LexA proteins are 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. LexA sequence homologs are found in almost all of the bacterial genomes sequenced to date, covering a large number of phyla, suggesting both, an ancient origin and a widespread distribution of lexA and the SOS response.


Pssm-ID: 119397 [Multi-domain]  Cd Length: 81  Bit Score: 87.23  E-value: 1.43e-23
                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 497895467  53 YVAKIDGDSMEGAkIFHDSLVVVDRSRKPSSGSIVIAALNNEPLCKILILQGD-HVVLKSANPAYPPRHIlEGEELSIWG 131
Cdd:cd06529    1 FALRVKGDSMEPT-IPDGDLVLVDPSDTPRDGDIVVARLDGELTVKRLQRRGGgRLRLISDNPAYPPIEI-DEEELEIVG 78


                 ..
gi 497895467 132 VV 133
Cdd:cd06529   79 VV 80
lexA TIGR00498
SOS regulatory protein LexA; LexA acts as a homodimer to repress a number of genes involved in ...
 22-133 3.21e-12

SOS regulatory protein LexA; LexA acts as a homodimer to repress a number of genes involved in the response to DNA damage (SOS response), including itself and RecA. RecA, in the presence of single-stranded DNA, acts as a co-protease to activate a latent autolytic protease activity (EC 3.4.21.88) of LexA, where the active site Ser is part of LexA. The autolytic cleavage site is an Ala-Gly bond in LexA (at position 84-85 in E. coli LexA; this sequence is replaced by Gly-Gly in Synechocystis). The cleavage leads to derepression of the SOS regulon and eventually to DNA repair. LexA in Bacillus subtilis is called DinR. LexA is much less broadly distributed than RecA. [DNA metabolism, DNA replication, recombination, and repair, Regulatory functions, DNA interactions]


Pssm-ID: 273106 [Multi-domain]  Cd Length: 199  Bit Score: 60.88  E-value: 3.21e-12
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 497895467   22 KIPAGFPNPAADHIEQDFSFDRLMDLRAPHIYVAKIDGDSMEGAKIFHDSLVVVDRSRKPSSGSIVIAALNNEPLCKILI 101
Cdd:TIGR00498  81 RVAAGEPILAEQHIEEYFPIDFSLLKKPSAVFLLKVMGDSMVDAGICDGDLLIVRSQKDARNGEIVAAMIDGEVTVKRFY 160

                          90       100       110
                  ....*....|....*....|....*....|..
gi 497895467  102 LQGDHVVLKSANPAYPPRhILEGEELSIWGVV 133
Cdd:TIGR00498 161 KDGTKVELKPENPEFDPI-VLNAEDVTILGKV 191
 
Name Accession Description Interval E-value
LexA COG1974
SOS-response transcriptional repressor LexA (RecA-mediated autopeptidase) [Transcription, ...
 16-135 3.67e-37

SOS-response transcriptional repressor LexA (RecA-mediated autopeptidase) [Transcription, Signal transduction mechanisms];


Pssm-ID: 441577 [Multi-domain]  Cd Length: 199  Bit Score: 125.41  E-value: 3.67e-37
                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 497895467  16 IPFYTfKIPAGFPNPAADHIEQDFSFDRLMDLRAPHIYVAKIDGDSMEGAKIFHDSLVVVDRSRKPSSGSIVIAALNNEP 95
Cdd:COG1974   77 LPLLG-RVAAGFPIPAEENIEEYLDLPEELVKNPGATFALRVKGDSMIDAGILDGDLVIVDRQLEAENGDIVVALIDGEA 155

                         90       100       110       120
                 ....*....|....*....|....*....|....*....|
gi 497895467  96 LCKILILQGDHVVLKSANPAYPPRHIlEGEELSIWGVVRH 135
Cdd:COG1974  156 TVKRLYKEGGRVRLQPENPAYPPIII-EGDDVEILGVVVG 194
Peptidase_S24 pfam00717
Peptidase S24-like;
17-133 1.61e-33

Peptidase S24-like;


Pssm-ID: 425835  Cd Length: 116  Bit Score: 113.45  E-value: 1.61e-33
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 497895467   17 PFYTfKIPAGFPNPAADHIEQDFSFDRLMDLRAPHIYVAKIDGDSMEgAKIFHDSLVVVDRSRKPSSGSIVIAALNNEPL 96
Cdd:pfam00717   1 PLIG-RVAAGAPILAEEEIEGYLPLPESLLSPPGNLFALRVKGDSME-PGIPDGDLVLVDPSREARNGDIVVARLDGEAT 78

                          90       100       110
                  ....*....|....*....|....*....|....*..
gi 497895467   97 CKILILQGDHVVLKSANPAYPPRHILEGEELSIWGVV 133
Cdd:pfam00717  79 VKRLYRDGGGIRLISLNPEYPPIELPAEDDVEIIGRV 115
PRK10276 PRK10276
translesion error-prone DNA polymerase V autoproteolytic subunit;
8-139 4.18e-25

translesion error-prone DNA polymerase V autoproteolytic subunit;


Pssm-ID: 182350  Cd Length: 139  Bit Score: 92.94  E-value: 4.18e-25
                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 497895467   8 RLCESGKVI--PFYTFKIPAGFPNPAADHIEQDFSFDRLMDLRAPHIYVAKIDGDSMEGAKIFHDSLVVVDRSRKPSSGS 85
Cdd:PRK10276   5 KPAELREIVtfPLFSDLVQCGFPSPAADYVEQRIDLNELLIQHPSATYFVKASGDSMIDAGISDGDLLIVDSAITASHGD 84

                         90       100       110       120       130
                 ....*....|....*....|....*....|....*....|....*....|....
gi 497895467  86 IVIAALNNEPLCKILILQgDHVVLKSANPAYPPRHILEGEELSIWGVVRHGVTS 139
Cdd:PRK10276  85 IVIAAVDGEFTVKKLQLR-PTVQLIPMNSAYSPITISSEDTLDVFGVVTHIVKA 137
S24_LexA-like cd06529
Peptidase S24 LexA-like proteins are involved in the SOS response leading to the repair of ...
 53-133 1.43e-23

Peptidase S24 LexA-like proteins are involved in the SOS response leading to the repair of single-stranded DNA within the bacterial cell. This family includes: 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 LexA-like proteins contain two-domains: an N-terminal DNA binding domain and a C-terminal domain (CTD) that provides LexA dimerization as well as cleavage activity. They undergo autolysis, cleaving at an Ala-Gly or a Cys-Gly bond, separating the DNA-binding domain from the rest of the protein. In the presence of single-stranded DNA, the LexA, UmuD and MucA proteins interact with RecA, activating self cleavage, thus either derepressing transcription in the case of LexA or activating the lesion-bypass polymerase in the case of UmuD and MucA. The LexA proteins are 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. LexA sequence homologs are found in almost all of the bacterial genomes sequenced to date, covering a large number of phyla, suggesting both, an ancient origin and a widespread distribution of lexA and the SOS response.


Pssm-ID: 119397 [Multi-domain]  Cd Length: 81  Bit Score: 87.23  E-value: 1.43e-23
                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 497895467  53 YVAKIDGDSMEGAkIFHDSLVVVDRSRKPSSGSIVIAALNNEPLCKILILQGD-HVVLKSANPAYPPRHIlEGEELSIWG 131
Cdd:cd06529    1 FALRVKGDSMEPT-IPDGDLVLVDPSDTPRDGDIVVARLDGELTVKRLQRRGGgRLRLISDNPAYPPIEI-DEEELEIVG 78


                 ..
gi 497895467 132 VV 133
Cdd:cd06529   79 VV 80
COG2932 COG2932
Phage repressor protein C, contains Cro/C1-type HTH and peptisase s24 domains [Mobilome: ...
 16-133 1.91e-16

Phage repressor protein C, contains Cro/C1-type HTH and peptisase s24 domains [Mobilome: prophages, transposons];


Pssm-ID: 442176  Cd Length: 121  Bit Score: 69.99  E-value: 1.91e-16
                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 497895467  16 IPFYTFKIPAGfpNPAADHIEQDFSFDRLMDLRAPHIYVAKIDGDSMEGaKIFHDSLVVVDRSRK-PSSGSIVIAALNNE 94
Cdd:COG2932    1 VPLYDGEASAG--GGAFNEVEEPVDKLEFPGLPPDNLFAVRVSGDSMEP-TIRDGDIVLVDPSDTeIRDGGIYVVRTDGE 77

                         90       100       110       120
                 ....*....|....*....|....*....|....*....|..
gi 497895467  95 PLCKILILQGDH-VVLKSANPAYPPRHIL--EGEELSIWGVV 133
Cdd:COG2932   78 LLVKRLQRRPDGkLRLISDNPAYPPIEIPpeDADEIEIIGRV 119
Peptidase_S24_S26 cd06462
The S24, S26 LexA/signal peptidase superfamily contains LexA-related and type I signal ...
 53-133 1.82e-15

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: 66.52  E-value: 1.82e-15
                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 497895467  53 YVAKIDGDSMEGAkIFHDSLVVVDRSRK-PSSGSIVIAALN-NEPLCKILILQG--DHVVLKSANPAYPPRHILEGEELS 128
Cdd:cd06462    1 FALRVEGDSMEPT-IPDGDLVLVDKSSYePKRGDIVVFRLPgGELTVKRVIGLPgeGHYFLLGDNPNSPDSRIDGPPELD 79


                 ....*
gi 497895467 129 IWGVV 133
Cdd:cd06462   80 IVGVV 84
lexA TIGR00498
SOS regulatory protein LexA; LexA acts as a homodimer to repress a number of genes involved in ...
 22-133 3.21e-12

SOS regulatory protein LexA; LexA acts as a homodimer to repress a number of genes involved in the response to DNA damage (SOS response), including itself and RecA. RecA, in the presence of single-stranded DNA, acts as a co-protease to activate a latent autolytic protease activity (EC 3.4.21.88) of LexA, where the active site Ser is part of LexA. The autolytic cleavage site is an Ala-Gly bond in LexA (at position 84-85 in E. coli LexA; this sequence is replaced by Gly-Gly in Synechocystis). The cleavage leads to derepression of the SOS regulon and eventually to DNA repair. LexA in Bacillus subtilis is called DinR. LexA is much less broadly distributed than RecA. [DNA metabolism, DNA replication, recombination, and repair, Regulatory functions, DNA interactions]


Pssm-ID: 273106 [Multi-domain]  Cd Length: 199  Bit Score: 60.88  E-value: 3.21e-12
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 497895467   22 KIPAGFPNPAADHIEQDFSFDRLMDLRAPHIYVAKIDGDSMEGAKIFHDSLVVVDRSRKPSSGSIVIAALNNEPLCKILI 101
Cdd:TIGR00498  81 RVAAGEPILAEQHIEEYFPIDFSLLKKPSAVFLLKVMGDSMVDAGICDGDLLIVRSQKDARNGEIVAAMIDGEVTVKRFY 160

                          90       100       110
                  ....*....|....*....|....*....|..
gi 497895467  102 LQGDHVVLKSANPAYPPRhILEGEELSIWGVV 133
Cdd:TIGR00498 161 KDGTKVELKPENPEFDPI-VLNAEDVTILGKV 191
 
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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