LEXA_STAAC
ID LEXA_STAAC Reviewed; 207 AA.
AC Q9L4P1; Q5HG80;
DT 27-APR-2001, integrated into UniProtKB/Swiss-Prot.
DT 15-MAR-2005, sequence version 3.
DT 03-AUG-2022, entry version 144.
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=SACOL1374;
OS Staphylococcus aureus (strain COL).
OC Bacteria; Firmicutes; Bacilli; Bacillales; Staphylococcaceae;
OC Staphylococcus.
OX NCBI_TaxID=93062;
RN [1]
RP NUCLEOTIDE SEQUENCE [GENOMIC DNA].
RX PubMed=10566865; DOI=10.1089/mdr.1999.5.163;
RA de Lencastre H., Wu S.-W., Pinho M.G., Ludovice A.M., Filipe S.,
RA Gardete S., Sobral R., Gill S.R., Chung M., Tomasz A.;
RT "Antibiotic resistance as a stress response: complete sequencing of a large
RT number of chromosomal loci in Staphylococcus aureus strain COL that impact
RT on the expression of resistance to methicillin.";
RL Microb. Drug Resist. 5:163-175(1999).
RN [2]
RP NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC STRAIN=COL;
RX PubMed=15774886; DOI=10.1128/jb.187.7.2426-2438.2005;
RA Gill S.R., Fouts D.E., Archer G.L., Mongodin E.F., DeBoy R.T., Ravel J.,
RA Paulsen I.T., Kolonay J.F., Brinkac L.M., Beanan M.J., Dodson R.J.,
RA Daugherty S.C., Madupu R., Angiuoli S.V., Durkin A.S., Haft D.H.,
RA Vamathevan J.J., Khouri H., Utterback T.R., Lee C., Dimitrov G., Jiang L.,
RA Qin H., Weidman J., Tran K., Kang K.H., Hance I.R., Nelson K.E.,
RA Fraser C.M.;
RT "Insights on evolution of virulence and resistance from the complete genome
RT analysis of an early methicillin-resistant Staphylococcus aureus strain and
RT a biofilm-producing methicillin-resistant Staphylococcus epidermidis
RT strain.";
RL J. Bacteriol. 187:2426-2438(2005).
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}.
CC -!- SEQUENCE CAUTION:
CC Sequence=CAB82463.1; Type=Frameshift; Evidence={ECO:0000305};
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DR EMBL; AJ132348; CAB82463.1; ALT_FRAME; Genomic_DNA.
DR EMBL; CP000046; AAW36623.1; -; Genomic_DNA.
DR RefSeq; WP_001208760.1; NC_002951.2.
DR AlphaFoldDB; Q9L4P1; -.
DR SMR; Q9L4P1; -.
DR MEROPS; S24.001; -.
DR EnsemblBacteria; AAW36623; AAW36623; SACOL1374.
DR KEGG; sac:SACOL1374; -.
DR HOGENOM; CLU_066192_45_1_9; -.
DR OMA; HVWLLPH; -.
DR Proteomes; UP000000530; Chromosome.
DR CollecTF; EXPREG_00001790; -.
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; EXP:CollecTF.
DR GO; GO:0006508; P:proteolysis; IEA:InterPro.
DR GO; GO:0009432; P:SOS response; IEA:UniProtKB-UniRule.
DR CDD; cd00090; HTH_ARSR; 1.
DR CDD; cd06529; S24_LexA-like; 1.
DR Gene3D; 1.10.10.10; -; 1.
DR HAMAP; MF_00015; LexA; 1.
DR InterPro; IPR011991; ArsR-like_HTH.
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..207
FT /note="LexA repressor"
FT /id="PRO_0000170087"
FT DNA_BIND 28..48
FT /note="H-T-H motif"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_00015"
FT ACT_SITE 130
FT /note="For autocatalytic cleavage activity"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_00015"
FT ACT_SITE 168
FT /note="For autocatalytic cleavage activity"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_00015"
FT SITE 93..94
FT /note="Cleavage; by autolysis"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_00015"
FT CONFLICT 176
FT /note="R -> C (in Ref. 1; CAB82463)"
FT /evidence="ECO:0000305"
SQ SEQUENCE 207 AA; 23301 MW; 2256B5E929B9E52C CRC64;
MRELTKRQSE IYNYIKQVVQ TKGYPPSVRE IGEAVGLASS STVHGHLSRL EEKGYIRRDP
TKPRAIEIVS DQTNDNINME ETIHVPVIGK VTAGVPITAV ENIEEYFPLP EHLTSTHNSD
IFILNVVGDS MIEAGILDGD KVIVRSQTIA ENGDIIVAMT EEDEATVKRF YKEKNRYRLQ
PENSTMEPIY LDNVAVIGKV IGLYREM
