ID   LEXA2_XANAC             Reviewed;         213 AA.
AC   P60511; O86050;
DT   01-MAR-2004, integrated into UniProtKB/Swiss-Prot.
DT   01-MAR-2004, sequence version 1.
DT   03-AUG-2022, entry version 117.
DE   RecName: Full=LexA repressor 2 {ECO:0000255|HAMAP-Rule:MF_00015};
DE            EC=3.4.21.88 {ECO:0000255|HAMAP-Rule:MF_00015};
GN   Name=lexA2 {ECO:0000255|HAMAP-Rule:MF_00015}; OrderedLocusNames=XAC1739;
OS   Xanthomonas axonopodis pv. citri (strain 306).
OC   Bacteria; Proteobacteria; Gammaproteobacteria; Xanthomonadales;
OC   Xanthomonadaceae; Xanthomonas.
OX   NCBI_TaxID=190486;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=306;
RX   PubMed=12024217; DOI=10.1038/417459a;
RA   da Silva A.C.R., Ferro J.A., Reinach F.C., Farah C.S., Furlan L.R.,
RA   Quaggio R.B., Monteiro-Vitorello C.B., Van Sluys M.A., Almeida N.F. Jr.,
RA   Alves L.M.C., do Amaral A.M., Bertolini M.C., Camargo L.E.A., Camarotte G.,
RA   Cannavan F., Cardozo J., Chambergo F., Ciapina L.P., Cicarelli R.M.B.,
RA   Coutinho L.L., Cursino-Santos J.R., El-Dorry H., Faria J.B.,
RA   Ferreira A.J.S., Ferreira R.C.C., Ferro M.I.T., Formighieri E.F.,
RA   Franco M.C., Greggio C.C., Gruber A., Katsuyama A.M., Kishi L.T.,
RA   Leite R.P., Lemos E.G.M., Lemos M.V.F., Locali E.C., Machado M.A.,
RA   Madeira A.M.B.N., Martinez-Rossi N.M., Martins E.C., Meidanis J.,
RA   Menck C.F.M., Miyaki C.Y., Moon D.H., Moreira L.M., Novo M.T.M.,
RA   Okura V.K., Oliveira M.C., Oliveira V.R., Pereira H.A., Rossi A.,
RA   Sena J.A.D., Silva C., de Souza R.F., Spinola L.A.F., Takita M.A.,
RA   Tamura R.E., Teixeira E.C., Tezza R.I.D., Trindade dos Santos M.,
RA   Truffi D., Tsai S.M., White F.F., Setubal J.C., Kitajima J.P.;
RT   "Comparison of the genomes of two Xanthomonas pathogens with differing host
RT   specificities.";
RL   Nature 417:459-463(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; AE008923; AAM36606.1; -; Genomic_DNA.
DR   RefSeq; WP_005915033.1; NC_003919.1.
DR   AlphaFoldDB; P60511; -.
DR   SMR; P60511; -.
DR   STRING; 190486.XAC1739; -.
DR   MEROPS; S24.001; -.
DR   EnsemblBacteria; AAM36606; AAM36606; XAC1739.
DR   GeneID; 66910889; -.
DR   KEGG; xac:XAC1739; -.
DR   eggNOG; COG1974; Bacteria.
DR   HOGENOM; CLU_066192_45_3_6; -.
DR   OMA; DDEFHIR; -.
DR   Proteomes; UP000000576; Chromosome.
DR   CollecTF; EXPREG_00000b80; -.
DR   GO; GO:0032993; C:protein-DNA complex; IMP:CollecTF.
DR   GO; GO:0001217; F:DNA-binding transcription repressor activity; IMP:CollecTF.
DR   GO; GO:0004252; F:serine-type endopeptidase activity; IEA:UniProtKB-UniRule.
DR   GO; GO:0000976; F:transcription cis-regulatory region binding; IMP:CollecTF.
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; IEP:CollecTF.
DR   GO; GO:0006508; P:proteolysis; IEA:InterPro.
DR   GO; GO:0009432; P:SOS response; IEP:CollecTF.
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..213
FT                   /note="LexA repressor 2"
FT                   /id="PRO_0000170106"
FT   DNA_BIND        27..47
FT                   /note="H-T-H motif"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00015"
FT   ACT_SITE        133
FT                   /note="For autocatalytic cleavage activity"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00015"
FT   ACT_SITE        170
FT                   /note="For autocatalytic cleavage activity"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00015"
FT   SITE            98..99
FT                   /note="Cleavage; by autolysis"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00015"
SQ   SEQUENCE   213 AA;  23240 MW;  30C56E5396EAF946 CRC64;
     MDLTDTQQAI LALIAERIDA DGVPPSQTEI ARAFGFKGIR AAQYHLEALE HAGAIRRVPG
     QARGIRLAGQ GAQTRTAPVS EVARDDVLRL PVLGRVAAGL PIGADIGSDD FVVLDRVFFS
     PSPDYLLKVQ GDSMRDEGIF NGDLIGVHRT RDARSGQIVV ARIDEEITVK LLKIGKDRIR
     LLPRNPDYAP IEVLPDQDFA IEGLYCGLLR PNR