A5EK34 (LEXA_BRASB) Reviewed, UniProtKB/Swiss-Prot

Names and origin

Protein names

Recommended name:
LexA repressor
EC=3.4.21.88

Gene names

Name:	lexA
Ordered Locus Names:	BBta_4496

Organism

Bradyrhizobium sp. (strain BTAi1 / ATCC BAA-1182) [Complete proteome] [HAMAP]

Taxonomic identifier

288000 [NCBI]

Taxonomic lineage

Bacteria › Proteobacteria › Alphaproteobacteria › Rhizobiales › Bradyrhizobiaceae › Bradyrhizobium

Protein attributes

Sequence length	232 AA.
Sequence status	Complete.
Protein existence	Inferred from homology

General annotation (Comments)

Function	Represses a number of genes involved in the response to DNA damage (SOS response), including recA and lexA. In the presence of single-stranded DNA, RecA interacts with LexA causing an autocatalytic cleavage which disrupts the DNA-binding part of LexA, leading to derepression of the SOS regulon and eventually DNA repair By similarity. HAMAP MF_00015
Catalytic activity	Hydrolysis of Ala-|-Gly bond in repressor lexA. HAMAP MF_00015
Subunit structure	Homodimer By similarity. HAMAP MF_00015
Sequence similarities	Belongs to the peptidase S24 family.

Ontologies

Keywords
Biological process	DNA damage DNA repair DNA replication SOS response Transcription Transcription regulation
Ligand	DNA-binding
Molecular function	Hydrolase Repressor
PTM	Autocatalytic cleavage
Technical term	Complete proteome
Gene Ontology (GO)
Biological process	DNA repair Inferred from electronic annotation. Source: UniProtKB-KW DNA replication Inferred from electronic annotation. Source: UniProtKB-KW SOS response Inferred from electronic annotation. Source: UniProtKB-KW proteolysis Inferred from electronic annotation. Source: InterPro regulation of transcription, DNA-dependent Inferred from electronic annotation. Source: UniProtKB-KW transcription, DNA-dependent Inferred from electronic annotation. Source: UniProtKB-KW
Molecular function	DNA binding Inferred from electronic annotation. Source: UniProtKB-KW serine-type endopeptidase activity Inferred from electronic annotation. Source: InterPro
Complete GO annotation...

Sequence annotation (Features)

	Feature key	Position(s)	Length	Description	Graphical view	Feature identifier
Molecule processing
	Chain	1 – 232	232	LexA repressor HAMAP MF_00015		PRO_1000001261
Regions
	DNA binding	26 – 46	21	H-T-H motif By similarity
Sites
	Active site	153	1	For autocatalytic cleavage activity By similarity
	Active site	191	1	For autocatalytic cleavage activity By similarity
	Site	118 – 119	2	Cleavage; by autolysis By similarity

Sequences

	Sequence		Length	Mass (Da)
	A5EK34 [UniParc]. Last modified June 12, 2007. Version 1. Checksum: 77A78BD6F04247D1	FASTA	232	25,651
	10 20 30 40 50 60 MLTRKQYELL RFINERLKEA GVPPSFDEMK DALDLRSKSG IHRLITALEE RGFIRRLPNR 70 80 90 100 110 120 ARAIEVIKLP ELSQAASNRR GFTPSVIEGN LGKVRTSTPA LDDGERPVAV PVMGRIAAGT 130 140 150 160 170 180 PIEALQTRSH TISVPADMLG NGDHYALEVR GDSMVDAGIL DGDMALIQRN ETADTGDIVV 190 200 210 220 230 ALIDDEEATL KRFRRRGASI ALEPANTAYE VRILPPNRVK IQGKLVGLYR KY

References

[1]

"Legumes symbioses: absence of nod genes in photosynthetic bradyrhizobia." Giraud E., Moulin L., Vallenet D., Barbe V., Cytryn E., Avarre J.-C., Jaubert M., Simon D., Cartieaux F., Prin Y., Bena G., Hannibal L., Fardoux J., Kojadinovic M., Vuillet L., Lajus A., Cruveiller S., Rouy Z. , Mangenot S., Segurens B., Dossat C., Franck W.L., Chang W.-S., Saunders E., Bruce D., Richardson P., Normand P., Dreyfus B., Pignol D., Stacey G., Emerich D., Vermeglio A., Medigue C., Sadowsky M. Science 316:1307-1312(2007) [PubMed: 17540897] [Abstract] Cited for: NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA]. Strain: BTAi1 / ATCC BAA-1182.

Cross-references

Sequence databases
EMBL GenBank DDBJ	CP000494 Genomic DNA. Translation: ABQ36528.1.
RefSeq	YP_001240434.1. NC_009485.1.
3D structure databases
ProteinModelPortal	A5EK34.
ModBase	Search...
Protein-protein interaction databases
STRING	A5EK34.
Protein family/group databases
MEROPS	S24.001.
Protocols and materials databases
StructuralBiologyKnowledgebase	Search...
Genome annotation databases
GeneID	5154771.
GenomeReviews	Gene locus BBta_4496 in contig CP000494_GR.
KEGG	bbt:BBta_4496.
PATRIC	21209737. VBIBraSp29847_4536.
Organism-specific databases
CMR	Search...
Phylogenomic databases
eggNOG	COG1974.
HOGENOM	HBG679610.
OMA	AILTFIR.
ProtClustDB	PRK00215.
Family and domain databases
HAMAP	MF_00015. LexA. [Tree]
InterPro	IPR006199. LexA_DNA-bd_dom. IPR006200. Pept_S24_LexA. IPR006197. Peptidase_S24_LexA. IPR019759. Peptidase_S24_S26. IPR015927. Peptidase_S24_S26A/B/C. IPR011056. Peptidase_S24_S26A/B/C_b-rbn. IPR011991. WHTH_trsnscrt_rep_DNA-bd. [Graphical view]
Gene3D	G3DSA:2.10.109.10. Pept_S24_S26_C. 1 hit. G3DSA:1.10.10.10. Wing_hlx_DNA_bd. 1 hit.
KO	K01356.
Pfam	PF01726. LexA_DNA_bind. 1 hit. PF00717. Peptidase_S24. 1 hit. [Graphical view]
PRINTS	PR00726. LEXASERPTASE.
SUPFAM	SSF51306. Pept_S24_S26_C. 1 hit.
TIGRFAMs	TIGR00498. LexA. 1 hit.
ProtoNet	Search...

Entry information

Entry name

LEXA_BRASB

Accession

Primary (citable) accession number: A5EK34

Entry history

Integrated into UniProtKB/Swiss-Prot:	January 15, 2008
Last sequence update:	June 12, 2007
Last modified:	January 25, 2012
This is version 34 of the entry and version 1 of the sequence. [Complete history]

Entry status

Reviewed (UniProtKB/Swiss-Prot)

Annotation program

Prokaryotic Protein Annotation Program