ID   LEXA_PARP8              Reviewed;         216 AA.
AC   B2JK89;
DT   24-MAR-2009, integrated into UniProtKB/Swiss-Prot.
DT   10-JUN-2008, sequence version 1.
DT   03-AUG-2022, entry version 83.
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}; OrderedLocusNames=Bphy_1630;
OS   Paraburkholderia phymatum (strain DSM 17167 / CIP 108236 / LMG 21445 /
OS   STM815) (Burkholderia phymatum).
OC   Bacteria; Proteobacteria; Betaproteobacteria; Burkholderiales;
OC   Burkholderiaceae; Paraburkholderia.
OX   NCBI_TaxID=391038;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=DSM 17167 / CIP 108236 / LMG 21445 / STM815;
RX   PubMed=25197461; DOI=10.4056/sigs.4861021;
RA   Moulin L., Klonowska A., Caroline B., Booth K., Vriezen J.A., Melkonian R.,
RA   James E.K., Young J.P., Bena G., Hauser L., Land M., Kyrpides N., Bruce D.,
RA   Chain P., Copeland A., Pitluck S., Woyke T., Lizotte-Waniewski M.,
RA   Bristow J., Riley M.;
RT   "Complete genome sequence of Burkholderia phymatum STM815(T), a broad host
RT   range and efficient nitrogen-fixing symbiont of Mimosa species.";
RL   Stand. Genomic Sci. 9:763-774(2014).
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; CP001043; ACC70812.1; -; Genomic_DNA.
DR   RefSeq; WP_012401022.1; NZ_CADFGH010000004.1.
DR   AlphaFoldDB; B2JK89; -.
DR   SMR; B2JK89; -.
DR   STRING; 391038.Bphy_1630; -.
DR   MEROPS; S24.001; -.
DR   EnsemblBacteria; ACC70812; ACC70812; Bphy_1630.
DR   KEGG; bph:Bphy_1630; -.
DR   eggNOG; COG1974; Bacteria.
DR   HOGENOM; CLU_066192_45_3_4; -.
DR   OMA; HVWLLPH; -.
DR   OrthoDB; 1933795at2; -.
DR   Proteomes; UP000001192; Chromosome 1.
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; Reference proteome; Repressor; SOS response;
KW   Transcription; Transcription regulation.
FT   CHAIN           1..216
FT                   /note="LexA repressor"
FT                   /id="PRO_1000089554"
FT   DNA_BIND        28..48
FT                   /note="H-T-H motif"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00015"
FT   ACT_SITE        134
FT                   /note="For autocatalytic cleavage activity"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00015"
FT   ACT_SITE        171
FT                   /note="For autocatalytic cleavage activity"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00015"
FT   SITE            99..100
FT                   /note="Cleavage; by autolysis"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00015"
SQ   SEQUENCE   216 AA;  23503 MW;  3C2743E2725EA1BD CRC64;
     MTKLTARQQQ VFDLIRRAIE RTGFPPTRAE IAAELGFSSA NSAEEHLRAL ARKGVIELAA
     GASRGIRLIA GQDDLPHQFT LPHASIMQLS LPLVGRVAAG SPILAQEHIS QTYMCDPSLF
     SSKPDYLLKV RGLSMRDAGI FDGDLLAVQK KSEAKDGQII VARLGDDVTV KRLKRRPDGL
     ELIAENPDYE NIFVQAGSAE FALEGIAVGL IRPSEF