ID LEXA_POLSJ Reviewed; 234 AA.
AC Q129C4;
DT 18-MAR-2008, integrated into UniProtKB/Swiss-Prot.
DT 22-AUG-2006, sequence version 1.
DT 27-MAR-2024, entry version 106.
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=Bpro_2954;
OS Polaromonas sp. (strain JS666 / ATCC BAA-500).
OC Bacteria; Pseudomonadota; Betaproteobacteria; Burkholderiales;
OC Comamonadaceae; Polaromonas.
OX NCBI_TaxID=296591;
RN [1]
RP NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC STRAIN=JS666 / ATCC BAA-500;
RX PubMed=18723656; DOI=10.1128/aem.00197-08;
RA Mattes T.E., Alexander A.K., Richardson P.M., Munk A.C., Han C.S.,
RA Stothard P., Coleman N.V.;
RT "The genome of Polaromonas sp. strain JS666: insights into the evolution of
RT a hydrocarbon- and xenobiotic-degrading bacterium, and features of
RT relevance to biotechnology.";
RL Appl. Environ. Microbiol. 74:6405-6416(2008).
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; CP000316; ABE44868.1; -; Genomic_DNA.
DR RefSeq; WP_011483866.1; NC_007948.1.
DR AlphaFoldDB; Q129C4; -.
DR SMR; Q129C4; -.
DR STRING; 296591.Bpro_2954; -.
DR MEROPS; S24.001; -.
DR KEGG; pol:Bpro_2954; -.
DR eggNOG; COG1974; Bacteria.
DR HOGENOM; CLU_066192_45_3_4; -.
DR OrthoDB; 9802364at2; -.
DR Proteomes; UP000001983; 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..234
FT /note="LexA repressor"
FT /id="PRO_0000322753"
FT DNA_BIND 41..61
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 189
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 234 AA; 25883 MW; 982F5BFA335F020C CRC64;
MSILNDFSHL SSEGPKLTAR QQQILELIQS AITRTGAPPT RAEIANELGF KSANAAEEHL
QALARKGVIE LVSGTSRGIR LRSDTLRSIH ESRVKQFSLP LQSLAQLALP LVGRVAAGSP
ILAQEHIEQT YYFESSLFQR QPDYLLKVRG MSMRDAGIID GDLLAVKQAK EARNGQIVVA
RIGDEVTVKR FRRTKHLIEL LPENPDFKTI VVEPGEPFEL EGLAVGLIRN TMLI
//
