Reviewed, UniProtKB/Swiss-Prot A8I825 (LEXA_AZOC5)

Names and origin

Protein names

Recommended name:
    LexA repressor
    EC=3.4.21.88

Gene names

Name:	lexA
Ordered Locus Names:	AZC_2201

Organism

Azorhizobium caulinodans (strain ATCC 43989 / DSM 5975 / ORS 571) [Complete proteome] [HAMAP]

Taxonomic identifier

438753 [NCBI]

Taxonomic lineage

Bacteria › Proteobacteria › Alphaproteobacteria › Rhizobiales › Xanthobacteraceae › Azorhizobium

Protein attributes

Sequence length	236 AA.
Sequence status	Complete.
Sequence processing	The displayed sequence is not processed.
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.
Catalytic activity	Hydrolysis of Ala-|-Gly bond in repressor lexA. HAMAP MF_00015
Subunit structure	Homodimer By similarity.
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: HAMAP DNA replication Inferred from electronic annotation. Source: HAMAP SOS response Inferred from electronic annotation. Source: HAMAP negative regulation of transcription, DNA-dependent Inferred from electronic annotation. Source: HAMAP proteolysis Inferred from electronic annotation. Source: InterPro transcription Inferred from electronic annotation. Source: UniProtKB-KW
Molecular function	DNA binding Inferred from electronic annotation. Source: HAMAP serine-type endopeptidase activity Inferred from electronic annotation. Source: HAMAP
Complete GO annotation...

Sequence annotation (Features)

	Feature key	Position(s)	Length	Description	Graphical view	Feature identifier
Molecule processing
	Chain	1 – 236	236	LexA repressor HAMAP MF_00015		PRO_1000070964
Regions
	DNA binding	26 – 46	21	H-T-H motif By similarity
Sites
	Active site	157	1	For autocatalytic cleavage activity By similarity
	Active site	195	1	For autocatalytic cleavage activity By similarity
	Site	122 – 123	2	Cleavage; by autolysis By similarity

Sequences

	Sequence		Length	Mass (Da)
	A8I825-1 [UniParc]. Last modified December 4, 2007. Version 1. Checksum: 646B2187ABF24E91	FASTA	236	25,740
	10 20 30 40 50 60 MLTRKQYDLL RFIHERLKET GVPPSFDEMK EALDLRSKSG IHRLITALEE RGFIRRLPNR 70 80 90 100 110 120 ARALEVVRLP DSAAPGLAAA RSGGRGFSPS VIEGSLGRVR PVVDDEEPAA VVAVPVMGRI 130 140 150 160 170 180 AAGSPISAIQ TRSNTLNLPP EMLGTGEHFA LEVRGDSMIE AGILDGDTVL IRKCDTADTG 190 200 210 220 230 DIIVALVDDE EATLKRLRRK GASIALEAAN PAYETRIFGP DRVRIQGRLV GLIRRY

References

[1]

"Complete genome sequence of the nitrogen-fixing bacterium Azorhizobium caulinodans ORS571." Lee K.B., Backer P.D., Aono T., Liu C.T., Suzuki S., Suzuki T., Kaneko T., Yamada M., Tabata S., Kupfer D.M., Najar F.Z., Wiley G.B., Roe B., Binnewies T., Ussery D., Vereecke D., Gevers D., Holsters M., Oyaizu H. Submitted (APR-2007) to the EMBL/GenBank/DDBJ databases Cited for: NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].

Cross-references

Sequence databases
EMBLGenBankDDBJ	AP009384 Genomic DNA. Translation: BAF88199.1.
RefSeq	YP_001525117.1.
3D structure databases
ModBase	Search...
Protein family/group databases
MEROPS	S24.001.
Genome annotation databases
GeneID	5689285.
GenomeReviews	Gene locus AZC_2201 in contig AP009384_GR.
KEGG	azc:AZC_2201.
Organism-specific databases
CMR	Search...
Phylogenomic databases
OMA	KVIGVFR.
Family and domain databases
HAMAP	MF_00015. [Tree]
InterPro	IPR006199. LexA_DNA_bd. IPR006200. Pept_S24_LexA. IPR006197. Peptidase_S24_LexA_cons-reg. IPR019759. Peptidase_S24_S26_cons-reg. IPR011056. Peptidase_S24_S26A/B/C_b-rbn. IPR011991. Wing_hlx_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.
Pfam	PF01726. LexA_DNA_bind. 1 hit. PF00717. Peptidase_S24. 1 hit. [Graphical view]
PRINTS	PR00726. LEXASERPTASE.
TIGRFAMs	TIGR00498. lexA. 1 hit.
ProtoNet	Search...

Entry information

Entry name

LEXA_AZOC5

Accession

Primary (citable) accession number: A8I825

Entry history

Integrated into UniProtKB/Swiss-Prot:	February 26, 2008
Last sequence update:	December 4, 2007
Last modified:	November 3, 2009
This is version 12 of the entry and version 1 of the sequence. [Complete history]

Entry status

Reviewed (UniProtKB/Swiss-Prot)

Annotation project

HAMAP (High-quality Automated and Manual Annotation of microbial Proteomes)