ID LEXA_BRADU Reviewed; 231 AA.
AC Q89KS7;
DT 01-MAR-2004, integrated into UniProtKB/Swiss-Prot.
DT 01-JUN-2003, sequence version 1.
DT 27-MAR-2024, entry version 117.
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=blr4826;
OS Bradyrhizobium diazoefficiens (strain JCM 10833 / BCRC 13528 / IAM 13628 /
OS NBRC 14792 / USDA 110).
OC Bacteria; Pseudomonadota; Alphaproteobacteria; Hyphomicrobiales;
OC Nitrobacteraceae; Bradyrhizobium.
OX NCBI_TaxID=224911;
RN [1]
RP NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC STRAIN=JCM 10833 / BCRC 13528 / IAM 13628 / NBRC 14792 / USDA 110;
RX PubMed=12597275; DOI=10.1093/dnares/9.6.189;
RA Kaneko T., Nakamura Y., Sato S., Minamisawa K., Uchiumi T., Sasamoto S.,
RA Watanabe A., Idesawa K., Iriguchi M., Kawashima K., Kohara M.,
RA Matsumoto M., Shimpo S., Tsuruoka H., Wada T., Yamada M., Tabata S.;
RT "Complete genomic sequence of nitrogen-fixing symbiotic bacterium
RT Bradyrhizobium japonicum USDA110.";
RL DNA Res. 9:189-197(2002).
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; BA000040; BAC50091.1; -; Genomic_DNA.
DR RefSeq; NP_771466.1; NC_004463.1.
DR RefSeq; WP_011087594.1; NZ_CP011360.1.
DR AlphaFoldDB; Q89KS7; -.
DR SMR; Q89KS7; -.
DR STRING; 224911.AAV28_21440; -.
DR MEROPS; S24.001; -.
DR EnsemblBacteria; BAC50091; BAC50091; BAC50091.
DR GeneID; 64024582; -.
DR KEGG; bja:blr4826; -.
DR PATRIC; fig|224911.44.peg.4671; -.
DR eggNOG; COG1974; Bacteria.
DR HOGENOM; CLU_066192_45_2_5; -.
DR InParanoid; Q89KS7; -.
DR OrthoDB; 9802364at2; -.
DR PhylomeDB; Q89KS7; -.
DR Proteomes; UP000002526; 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 DNA-templated transcription; 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; 2.10.109.10; Umud Fragment, subunit A; 1.
DR Gene3D; 1.10.10.10; Winged helix-like DNA-binding domain superfamily/Winged helix DNA-binding domain; 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 NCBIfam; TIGR00498; lexA; 1.
DR PANTHER; PTHR33516; LEXA REPRESSOR; 1.
DR PANTHER; PTHR33516:SF2; LEXA REPRESSOR; 1.
DR Pfam; PF01726; LexA_DNA_bind; 1.
DR Pfam; PF00717; Peptidase_S24; 1.
DR PRINTS; PR00726; LEXASERPTASE.
DR SUPFAM; SSF51306; LexA/Signal peptidase; 1.
DR SUPFAM; SSF46785; Winged helix' DNA-binding domain; 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..231
FT /note="LexA repressor"
FT /id="PRO_0000170017"
FT DNA_BIND 26..46
FT /note="H-T-H motif"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_00015"
FT ACT_SITE 152
FT /note="For autocatalytic cleavage activity"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_00015"
FT ACT_SITE 190
FT /note="For autocatalytic cleavage activity"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_00015"
FT SITE 117..118
FT /note="Cleavage; by autolysis"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_00015"
SQ SEQUENCE 231 AA; 25438 MW; A482D4D8CA596122 CRC64;
MLTRKQYELL RFISERLKES GVPPSFDEMK DALDLRSKSG IHRLITALEE RGFIRRLPNR
ARAIEVIKLP ELQAAAGNRR GFTPSVIEGN LGKVRASSSA DEGERPVAVP VMGRIAAGTP
IEALQTRSHT ISVPPDMLGS GEHYALEVRG DSMVEAGILD GDMALIQRNE SADTGDIVVA
LIDDEEATLK RFRRRGASIA LEPANAAYEV RILPPNRVKI QGKLIGLYRK Y
//
