ID   LEXA_RHIE6              Reviewed;         239 AA.
AC   B3PYQ7;
DT   24-MAR-2009, integrated into UniProtKB/Swiss-Prot.
DT   02-SEP-2008, sequence version 1.
DT   03-AUG-2022, entry version 82.
DE   RecName: Full=LexA repressor {ECO:0000255|HAMAP-Rule:MF_00015};
DE            EC=3.4.21.88 {ECO:0000255|HAMAP-Rule:MF_00015};
GN   Name=lexA {ECO:0000255|HAMAP-Rule:MF_00015};
GN   OrderedLocusNames=RHECIAT_CH0002025;
OS   Rhizobium etli (strain CIAT 652).
OC   Bacteria; Proteobacteria; Alphaproteobacteria; Hyphomicrobiales;
OC   Rhizobiaceae; Rhizobium/Agrobacterium group; Rhizobium.
OX   NCBI_TaxID=491916;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=CIAT 652;
RA   Gonzalez V., Acosta J.L., Santamaria R.I., Bustos P.,
RA   Hernandez-Gonzalez I.L., Fernandez J.L., Diaz R., Flores M., Mora J.,
RA   Palacios R., Davila G.;
RT   "Genome diversity and DNA divergence of Rhizobium etli.";
RL   Submitted (APR-2008) to the EMBL/GenBank/DDBJ databases.
CC   -!- FUNCTION: Represses a number of genes involved in the response to DNA
CC       damage (SOS response), including recA and lexA. In the presence of
CC       single-stranded DNA, RecA interacts with LexA causing an autocatalytic
CC       cleavage which disrupts the DNA-binding part of LexA, leading to
CC       derepression of the SOS regulon and eventually DNA repair.
CC       {ECO:0000255|HAMAP-Rule:MF_00015}.
CC   -!- CATALYTIC ACTIVITY:
CC       Reaction=Hydrolysis of Ala-|-Gly bond in repressor LexA.; EC=3.4.21.88;
CC         Evidence={ECO:0000255|HAMAP-Rule:MF_00015};
CC   -!- SUBUNIT: Homodimer. {ECO:0000255|HAMAP-Rule:MF_00015}.
CC   -!- SIMILARITY: Belongs to the peptidase S24 family. {ECO:0000255|HAMAP-
CC       Rule:MF_00015}.
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DR   EMBL; CP001074; ACE90986.1; -; Genomic_DNA.
DR   RefSeq; WP_012483680.1; NC_010994.1.
DR   AlphaFoldDB; B3PYQ7; -.
DR   SMR; B3PYQ7; -.
DR   MEROPS; S24.001; -.
DR   EnsemblBacteria; ACE90986; ACE90986; RHECIAT_CH0002025.
DR   GeneID; 45957356; -.
DR   KEGG; rec:RHECIAT_CH0002025; -.
DR   eggNOG; COG1974; Bacteria.
DR   HOGENOM; CLU_066192_45_2_5; -.
DR   OMA; HVWLLPH; -.
DR   Proteomes; UP000008817; Chromosome.
DR   GO; GO:0003677; F:DNA binding; IEA:UniProtKB-UniRule.
DR   GO; GO:0004252; F:serine-type endopeptidase activity; IEA:UniProtKB-UniRule.
DR   GO; GO:0006281; P:DNA repair; IEA:UniProtKB-UniRule.
DR   GO; GO:0006260; P:DNA replication; IEA:UniProtKB-UniRule.
DR   GO; GO:0045892; P:negative regulation of transcription, DNA-templated; IEA:UniProtKB-UniRule.
DR   GO; GO:0006508; P:proteolysis; IEA:InterPro.
DR   GO; GO:0009432; P:SOS response; IEA:UniProtKB-UniRule.
DR   CDD; cd06529; S24_LexA-like; 1.
DR   Gene3D; 1.10.10.10; -; 1.
DR   HAMAP; MF_00015; LexA; 1.
DR   InterPro; IPR006200; LexA.
DR   InterPro; IPR039418; LexA-like.
DR   InterPro; IPR036286; LexA/Signal_pep-like_sf.
DR   InterPro; IPR006199; LexA_DNA-bd_dom.
DR   InterPro; IPR006197; Peptidase_S24_LexA.
DR   InterPro; IPR015927; Peptidase_S24_S26A/B/C.
DR   InterPro; IPR036388; WH-like_DNA-bd_sf.
DR   InterPro; IPR036390; WH_DNA-bd_sf.
DR   Pfam; PF01726; LexA_DNA_bind; 1.
DR   Pfam; PF00717; Peptidase_S24; 1.
DR   PRINTS; PR00726; LEXASERPTASE.
DR   SUPFAM; SSF46785; SSF46785; 1.
DR   SUPFAM; SSF51306; SSF51306; 1.
DR   TIGRFAMs; TIGR00498; lexA; 1.
PE   3: Inferred from homology;
KW   Autocatalytic cleavage; DNA damage; DNA repair; DNA replication;
KW   DNA-binding; Hydrolase; Repressor; SOS response; Transcription;
KW   Transcription regulation.
FT   CHAIN           1..239
FT                   /note="LexA repressor"
FT                   /id="PRO_1000089586"
FT   DNA_BIND        26..46
FT                   /note="H-T-H motif"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00015"
FT   ACT_SITE        159
FT                   /note="For autocatalytic cleavage activity"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00015"
FT   ACT_SITE        197
FT                   /note="For autocatalytic cleavage activity"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00015"
FT   SITE            124..125
FT                   /note="Cleavage; by autolysis"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00015"
SQ   SEQUENCE   239 AA;  25764 MW;  8DE492B27352C417 CRC64;
     MLTRKQQELL LFIHERMKES GVPPSFDEMK DALDLASKSG IHRLITALEE RGFIRRLPNR
     ARALEVIKLP EAYSPSLQPR RGFSPSVIEG SLGKPPAVAA PAAAKPIADN GNSVSVPVMG
     RIAAGVPISA IQNNTHDIVV PADMLGSGEH YALEVKGDSM IDAGIFDGDT VIIRNGSTAS
     PGDIVVALVD DEEATLKRFR RKGASIALEA ANPAYETRIF GPDRVKVQGK LVGLIRRYH