LEXA_RHIRD
ID LEXA_RHIRD Reviewed; 239 AA.
AC P61605;
DT 24-MAY-2004, integrated into UniProtKB/Swiss-Prot.
DT 24-MAY-2004, sequence version 1.
DT 03-AUG-2022, entry version 77.
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};
OS Rhizobium radiobacter (Agrobacterium tumefaciens) (Agrobacterium
OS radiobacter).
OC Bacteria; Proteobacteria; Alphaproteobacteria; Hyphomicrobiales;
OC Rhizobiaceae; Rhizobium/Agrobacterium group; Agrobacterium;
OC Agrobacterium tumefaciens complex.
OX NCBI_TaxID=358;
RN [1]
RP NUCLEOTIDE SEQUENCE [GENOMIC DNA].
RA Campoy S., Tapias A., Mazon G., Barbe J.;
RT "The lexA gene of Agrobacterium tumefaciens.";
RL Submitted (MAR-2000) 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; AF251129; AAQ14270.1; -; Genomic_DNA.
DR AlphaFoldDB; P61605; -.
DR SMR; P61605; -.
DR MEROPS; S24.001; -.
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_0000169999"
FT DNA_BIND 27..47
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; 25622 MW; 7593331A8E06D52A CRC64;
MLTRKQQELL LFIHGTNEGN PGVPPSFDEM KDALDLASKS GIHRLITALE ERGFIRRLPN
RARALEVIKL PEAYAGASQV RRGFSPTVIE GSLGKLASPP PAPKPAPPAE AASVAVPVMG
RIAAGVPISA IQNNMHDISV PVEMIGSGEH YALEIKGDSM IEAGILDGDT VIIRNGSTAS
PGDIVVALID DEEATLKRFR RKGASIALEA ANPAYETRIF GPDRVKIQGR LVGLIRRYH
