Reviewed, UniProtKB/Swiss-Prot B6ENU0 (LEXA_ALISL)

Names and origin

Protein names

Recommended name:
    LexA repressor
    EC=3.4.21.88

Gene names

Name:	lexA
Ordered Locus Names:	VSAL_I2893

Organism

Aliivibrio salmonicida (strain LFI1238) (Vibrio salmonicida (strain LFI1238)) [Complete proteome] [HAMAP]

Taxonomic identifier

316275 [NCBI]

Taxonomic lineage

Bacteria › Proteobacteria › Gammaproteobacteria › Vibrionales › Vibrionaceae › Aliivibrio

Protein attributes

Sequence length	207 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 – 207	207	LexA repressor HAMAP MF_00015		PRO_1000089542
Regions
	DNA binding	28 – 48	21	H-T-H motif By similarity
Sites
	Active site	124	1	For autocatalytic cleavage activity By similarity
	Active site	161	1	For autocatalytic cleavage activity By similarity
	Site	89 – 90	2	Cleavage; by autolysis By similarity

Sequences

	Sequence		Length	Mass (Da)
	B6ENU0-1 [UniParc]. Last modified November 25, 2008. Version 1. Checksum: C4F95260A5E2875D	FASTA	207	22,854
	10 20 30 40 50 60 MKPLTARQQE VFELIKAKIE DTGMPPTRAE IARELGFRSA NAAEEHLKAL ARKQAIEIIP 70 80 90 100 110 120 GASRGIRILL QDPVEPEDLG LPLIGQVAAG EPILAQEHVE SHYQVDPSMF KPQADFLLRV 130 140 150 160 170 180 NGESMKNIGI MDGDLLAVHK TQDVHDGQVV VARVDDDVTV KRLERKGSMV FLHAENEEFA 190 200 PIQVDLTSQH LSIEGIAVGV IRSTTWM

References

[1]

"The complete genome sequence of the fish pathogen Aliivibrio salmonicida strain LFI1238." Hjerde E., Lorentzen M.S., Holden M.T.G., Seeger K., Paulsen S., Bason N., Churcher C., Harris D., Norbertczak H., Quail M.A., Sanders S., Thurston S., Parkhill J., Willassen N.-P., Thomson N.R. Submitted (JUN-2008) to the EMBL/GenBank/DDBJ databases Cited for: NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].

Cross-references

Sequence databases
EMBLGenBankDDBJ	FM178379 Genomic DNA. Translation: CAQ80577.1.
RefSeq	YP_002264223.1.
3D structure databases
ModBase	Search...
Genome annotation databases
GeneID	6987964.
GenomeReviews	Gene locus VSAL_I2893 in contig FM178379_GR.
KEGG	vsa:VSAL_I2893.
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_ALISL

Accession

Primary (citable) accession number: B6ENU0

Entry history

Integrated into UniProtKB/Swiss-Prot:	March 24, 2009
Last sequence update:	November 25, 2008
Last modified:	November 3, 2009
This is version 13 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)