LEXA_THEFY
ID LEXA_THEFY Reviewed; 252 AA.
AC Q47MY4;
DT 18-MAR-2008, integrated into UniProtKB/Swiss-Prot.
DT 13-SEP-2005, sequence version 1.
DT 03-AUG-2022, entry version 123.
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=Tfu_2152;
OS Thermobifida fusca (strain YX).
OC Bacteria; Actinobacteria; Streptosporangiales; Nocardiopsaceae;
OC Thermobifida.
OX NCBI_TaxID=269800;
RN [1]
RP NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC STRAIN=YX;
RX PubMed=17209016; DOI=10.1128/jb.01899-06;
RA Lykidis A., Mavromatis K., Ivanova N., Anderson I., Land M., DiBartolo G.,
RA Martinez M., Lapidus A., Lucas S., Copeland A., Richardson P., Wilson D.B.,
RA Kyrpides N.;
RT "Genome sequence and analysis of the soil cellulolytic actinomycete
RT Thermobifida fusca YX.";
RL J. Bacteriol. 189:2477-2486(2007).
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 ---------------------------------------------------------------------------
CC Copyrighted by the UniProt Consortium, see https://www.uniprot.org/terms
CC Distributed under the Creative Commons Attribution (CC BY 4.0) License
CC ---------------------------------------------------------------------------
DR EMBL; CP000088; AAZ56185.1; -; Genomic_DNA.
DR RefSeq; WP_011292575.1; NC_007333.1.
DR AlphaFoldDB; Q47MY4; -.
DR SMR; Q47MY4; -.
DR STRING; 269800.Tfu_2152; -.
DR MEROPS; S24.001; -.
DR EnsemblBacteria; AAZ56185; AAZ56185; Tfu_2152.
DR KEGG; tfu:Tfu_2152; -.
DR eggNOG; COG1974; Bacteria.
DR HOGENOM; CLU_066192_45_0_11; -.
DR OMA; HVWLLPH; -.
DR OrthoDB; 1933795at2; -.
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; cd06529; S24_LexA-like; 1.
DR Gene3D; 1.10.10.10; -; 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 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..252
FT /note="LexA repressor"
FT /id="PRO_0000322769"
FT DNA_BIND 67..87
FT /note="H-T-H motif"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_00015"
FT REGION 1..46
FT /note="Disordered"
FT /evidence="ECO:0000256|SAM:MobiDB-lite"
FT COMPBIAS 29..46
FT /note="Polar residues"
FT /evidence="ECO:0000256|SAM:MobiDB-lite"
FT ACT_SITE 176
FT /note="For autocatalytic cleavage activity"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_00015"
FT ACT_SITE 213
FT /note="For autocatalytic cleavage activity"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_00015"
FT SITE 141..142
FT /note="Cleavage; by autolysis"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_00015"
SQ SEQUENCE 252 AA; 27434 MW; D72988EA0035BB00 CRC64;
MPEENRGGHQ PYTEESSVSA LHPVRTDDSV GSSAEQTGDA PTLTERQRSV LNVIHRYVRE
RGYPPSIREI GEAVGLSSPS SVAHQLKVLQ RKGYLHRDQN RPRAVEIRIP HKTSGRTRRE
LGGLSGSEEI VDIPLLGRIA AGGPILAEEH VEDVLSLPRQ LVGEGTLFML TVVGDSMIDA
AIADGDLVVV RQQPDANNGD IVAALLGDEA TVKVFKRDRE HVWLLPRNSA YDPINGDSAT
ILGKVVTVLR KV
