LEXA_BACHK
ID LEXA_BACHK Reviewed; 206 AA.
AC Q6HFB0;
DT 01-FEB-2005, integrated into UniProtKB/Swiss-Prot.
DT 19-JUL-2004, sequence version 1.
DT 03-AUG-2022, entry version 110.
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=BT9727_3444;
OS Bacillus thuringiensis subsp. konkukian (strain 97-27).
OC Bacteria; Firmicutes; Bacilli; Bacillales; Bacillaceae; Bacillus;
OC Bacillus cereus group.
OX NCBI_TaxID=281309;
RN [1]
RP NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC STRAIN=97-27;
RX PubMed=16621833; DOI=10.1128/jb.188.9.3382-3390.2006;
RA Han C.S., Xie G., Challacombe J.F., Altherr M.R., Bhotika S.S., Bruce D.,
RA Campbell C.S., Campbell M.L., Chen J., Chertkov O., Cleland C.,
RA Dimitrijevic M., Doggett N.A., Fawcett J.J., Glavina T., Goodwin L.A.,
RA Hill K.K., Hitchcock P., Jackson P.J., Keim P., Kewalramani A.R.,
RA Longmire J., Lucas S., Malfatti S., McMurry K., Meincke L.J., Misra M.,
RA Moseman B.L., Mundt M., Munk A.C., Okinaka R.T., Parson-Quintana B.,
RA Reilly L.P., Richardson P., Robinson D.L., Rubin E., Saunders E., Tapia R.,
RA Tesmer J.G., Thayer N., Thompson L.S., Tice H., Ticknor L.O., Wills P.L.,
RA Brettin T.S., Gilna P.;
RT "Pathogenomic sequence analysis of Bacillus cereus and Bacillus
RT thuringiensis isolates closely related to Bacillus anthracis.";
RL J. Bacteriol. 188:3382-3390(2006).
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; AE017355; AAT61456.1; -; Genomic_DNA.
DR RefSeq; WP_000413738.1; NC_005957.1.
DR RefSeq; YP_037766.1; NC_005957.1.
DR AlphaFoldDB; Q6HFB0; -.
DR SMR; Q6HFB0; -.
DR MEROPS; S24.001; -.
DR EnsemblBacteria; AAT61456; AAT61456; BT9727_3444.
DR GeneID; 59155806; -.
DR GeneID; 64202240; -.
DR GeneID; 67508337; -.
DR KEGG; btk:BT9727_3444; -.
DR PATRIC; fig|281309.8.peg.3679; -.
DR HOGENOM; CLU_066192_45_1_9; -.
DR OMA; HVWLLPH; -.
DR BRENDA; 3.4.21.88; 16990.
DR Proteomes; UP000001301; 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; 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..206
FT /note="LexA repressor"
FT /id="PRO_0000170007"
FT DNA_BIND 28..48
FT /note="H-T-H motif"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_00015"
FT ACT_SITE 128
FT /note="For autocatalytic cleavage activity"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_00015"
FT ACT_SITE 166
FT /note="For autocatalytic cleavage activity"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_00015"
FT SITE 92..93
FT /note="Cleavage; by autolysis"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_00015"
SQ SEQUENCE 206 AA; 22890 MW; CC4077E937DF8D09 CRC64;
MEKLTKRQQD ILDFIKLKVQ EKGYPPSVRE IGQAVGLASS STVHGHLSRL EEKGYIRRDP
TKPRAIEILG EDRMDTETQS VIQVPIVGKV TAGLPITAVE SVEEHFPLPA SIVAGADQVF
MLRISGDSMI EAGIFDGDLV VVRQQQSAYN GEIVVALTED NEATVKRFYK EKDHFRLQPE
NSSLEPIILK QVSVIGKVIG VYRDLH
