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Database: UniProt
Entry: A0A0G0BL93_9BACT
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ID   A0A0G0BL93_9BACT        Unreviewed;       206 AA.
AC   A0A0G0BL93;
DT   22-JUL-2015, integrated into UniProtKB/TrEMBL.
DT   22-JUL-2015, sequence version 1.
DT   13-SEP-2023, entry version 36.
DE   RecName: Full=LexA repressor {ECO:0000256|HAMAP-Rule:MF_00015};
DE            EC=3.4.21.88 {ECO:0000256|HAMAP-Rule:MF_00015};
GN   Name=lexA {ECO:0000256|HAMAP-Rule:MF_00015};
GN   ORFNames=UR21_C0005G0039 {ECO:0000313|EMBL:KKP31817.1};
OS   Candidatus Woesebacteria bacterium GW2011_GWC2_31_9.
OC   Bacteria; Candidatus Woesebacteria.
OX   NCBI_TaxID=1618586 {ECO:0000313|EMBL:KKP31817.1, ECO:0000313|Proteomes:UP000034803};
RN   [1] {ECO:0000313|EMBL:KKP31817.1, ECO:0000313|Proteomes:UP000034803}
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RA   Brown C.T., Hug L.A., Thomas B.C., Sharon I., Castelle C.J., Singh A.,
RA   Wilkins M.J., Williams K.H., Banfield J.F.;
RT   "rRNA introns, odd ribosomes, and small enigmatic genomes across a large
RT   radiation of phyla.";
RL   Nature 0:0-0(2015).
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:0000256|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:0000256|HAMAP-Rule:MF_00015};
CC   -!- SUBUNIT: Homodimer. {ECO:0000256|HAMAP-Rule:MF_00015}.
CC   -!- SIMILARITY: Belongs to the peptidase S24 family. {ECO:0000256|HAMAP-
CC       Rule:MF_00015}.
CC   -!- CAUTION: The sequence shown here is derived from an EMBL/GenBank/DDBJ
CC       whole genome shotgun (WGS) entry which is preliminary data.
CC       {ECO:0000313|EMBL:KKP31817.1}.
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DR   EMBL; LBOI01000005; KKP31817.1; -; Genomic_DNA.
DR   AlphaFoldDB; A0A0G0BL93; -.
DR   PATRIC; fig|1618586.3.peg.370; -.
DR   Proteomes; UP000034803; Unassembled WGS sequence.
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; 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   SUPFAM; SSF51306; LexA/Signal peptidase; 1.
DR   SUPFAM; SSF46785; Winged helix' DNA-binding domain; 1.
PE   3: Inferred from homology;
KW   Autocatalytic cleavage {ECO:0000256|HAMAP-Rule:MF_00015};
KW   DNA damage {ECO:0000256|HAMAP-Rule:MF_00015};
KW   DNA repair {ECO:0000256|HAMAP-Rule:MF_00015};
KW   DNA replication {ECO:0000256|ARBA:ARBA00022705, ECO:0000256|HAMAP-
KW   Rule:MF_00015};
KW   DNA-binding {ECO:0000256|ARBA:ARBA00023125, ECO:0000256|HAMAP-
KW   Rule:MF_00015}; Hydrolase {ECO:0000256|HAMAP-Rule:MF_00015};
KW   Repressor {ECO:0000256|ARBA:ARBA00022491, ECO:0000256|HAMAP-Rule:MF_00015};
KW   SOS response {ECO:0000256|ARBA:ARBA00023236, ECO:0000256|HAMAP-
KW   Rule:MF_00015};
KW   Transcription {ECO:0000256|ARBA:ARBA00023163, ECO:0000256|HAMAP-
KW   Rule:MF_00015};
KW   Transcription regulation {ECO:0000256|ARBA:ARBA00023015, ECO:0000256|HAMAP-
KW   Rule:MF_00015}.
FT   DOMAIN          7..65
FT                   /note="LexA repressor DNA-binding"
FT                   /evidence="ECO:0000259|Pfam:PF01726"
FT   DOMAIN          83..197
FT                   /note="Peptidase S24/S26A/S26B/S26C"
FT                   /evidence="ECO:0000259|Pfam:PF00717"
FT   DNA_BIND        29..49
FT                   /note="H-T-H motif"
FT                   /evidence="ECO:0000256|HAMAP-Rule:MF_00015"
FT   ACT_SITE        126
FT                   /note="For autocatalytic cleavage activity"
FT                   /evidence="ECO:0000256|HAMAP-Rule:MF_00015"
FT   ACT_SITE        164
FT                   /note="For autocatalytic cleavage activity"
FT                   /evidence="ECO:0000256|HAMAP-Rule:MF_00015"
FT   SITE            90..91
FT                   /note="Cleavage; by autolysis"
FT                   /evidence="ECO:0000256|HAMAP-Rule:MF_00015"
SQ   SEQUENCE   206 AA;  23000 MW;  8E6DD7EDE008CE84 CRC64;
     MAPIIYKRQG QILDFISQQI ESTGFAPTLR QIADAIGVRS LATVHEHVAS LIEKGLLKRT
     SGRLRKMELS APVSFNNEGM TVPILGFIAA GQPIEPFTDP NAHMSIPPNF TNRQKRVYVL
     QVRGESMIED HISDGDYVIC EQVETANNGE IVVALLNNGM ATLKRYFKEA TRIRLEPANV
     KMQPIFVKNV TIQGRVVGLI RRYGRI
//
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