ID K9QSR0_NOSS7 Unreviewed; 201 AA.
AC K9QSR0;
DT 06-MAR-2013, integrated into UniProtKB/TrEMBL.
DT 06-MAR-2013, sequence version 1.
DT 27-MAR-2024, entry version 63.
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 OrderedLocusNames=Nos7524_2598 {ECO:0000313|EMBL:AFY48433.1};
OS Nostoc sp. (strain ATCC 29411 / PCC 7524).
OC Bacteria; Cyanobacteriota; Cyanophyceae; Nostocales; Nostocaceae; Nostoc.
OX NCBI_TaxID=28072 {ECO:0000313|EMBL:AFY48433.1, ECO:0000313|Proteomes:UP000010378};
RN [1] {ECO:0000313|Proteomes:UP000010378}
RP NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC STRAIN=ATCC 29411 / PCC 7524 {ECO:0000313|Proteomes:UP000010378};
RX PubMed=23277585; DOI=10.1073/pnas.1217107110;
RA Shih P.M., Wu D., Latifi A., Axen S.D., Fewer D.P., Talla E., Calteau A.,
RA Cai F., Tandeau de Marsac N., Rippka R., Herdman M., Sivonen K.,
RA Coursin T., Laurent T., Goodwin L., Nolan M., Davenport K.W., Han C.S.,
RA Rubin E.M., Eisen J.A., Woyke T., Gugger M., Kerfeld C.A.;
RT "Improving the coverage of the cyanobacterial phylum using diversity-driven
RT genome sequencing.";
RL Proc. Natl. Acad. Sci. U.S.A. 110:1053-1058(2013).
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}.
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DR EMBL; CP003552; AFY48433.1; -; Genomic_DNA.
DR RefSeq; WP_015138871.1; NC_019684.1.
DR AlphaFoldDB; K9QSR0; -.
DR STRING; 28072.Nos7524_2598; -.
DR MEROPS; S24.001; -.
DR KEGG; nop:Nos7524_2598; -.
DR PATRIC; fig|28072.8.peg.2844; -.
DR eggNOG; COG1974; Bacteria.
DR HOGENOM; CLU_066192_45_2_3; -.
DR OrthoDB; 9802364at2; -.
DR Proteomes; UP000010378; 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; 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 Reference proteome {ECO:0000313|Proteomes:UP000010378};
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 1..65
FT /note="LexA repressor DNA-binding"
FT /evidence="ECO:0000259|Pfam:PF01726"
FT DOMAIN 77..194
FT /note="Peptidase S24/S26A/S26B/S26C"
FT /evidence="ECO:0000259|Pfam:PF00717"
FT DNA_BIND 28..48
FT /note="H-T-H motif"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_00015"
FT ACT_SITE 118
FT /note="For autocatalytic cleavage activity"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_00015"
FT ACT_SITE 159
FT /note="For autocatalytic cleavage activity"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_00015"
FT SITE 84..85
FT /note="Cleavage; by autolysis"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_00015"
SQ SEQUENCE 201 AA; 22665 MW; EE53FCD9939A2516 CRC64;
MERLTEAQQE LYEWLAEYIR THQHSPSIRQ MMQAMNLKSP APIQSRLEHL RTKGYIEWTE
GKARTIRILH SVKQGVPVLG TIAAGGLIEP FTDAVDHIDF NNMALPPQTY ALRVTGDSMI
EDLITDGDLV FLRPVPEPNH LKNGTIVAAR VDGYGTTLKR FYRSGDRVIL KPANPKYNPI
EVSAMQVEVQ GSLVAVWRGY L
//
