Reviewed, UniProtKB/Swiss-Prot A6TR70 (LEXA_ALKMQ)

Names and origin

Protein names

Recommended name:
    LexA repressor
    EC=3.4.21.88

Gene names

Name:	lexA
Ordered Locus Names:	Amet_2535

Organism

Alkaliphilus metalliredigens (strain QYMF) [Complete proteome] [HAMAP]

Taxonomic identifier

293826 [NCBI]

Taxonomic lineage

Bacteria › Firmicutes › Clostridia › Clostridiales › Clostridiaceae › Alkaliphilus

Protein attributes

Sequence length	206 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 – 206	206	LexA repressor HAMAP MF_00015		PRO_1000057124
Regions
	DNA binding	29 – 49	21	H-T-H motif By similarity
Sites
	Active site	130	1	For autocatalytic cleavage activity By similarity
	Active site	167	1	For autocatalytic cleavage activity By similarity
	Site	95 – 96	2	Cleavage; by autolysis By similarity

Sequences

	Sequence		Length	Mass (Da)
	A6TR70-1 [UniParc]. Last modified August 21, 2007. Version 1. Checksum: 0AE5928731CD96BB	FASTA	206	23,048
	10 20 30 40 50 60 MYEDLNDNQI KILHYMKSEI SQKGYPPSVR EICQAVGLKS TSTAHGHLSK LELKGYIRRD 70 80 90 100 110 120 ATKPRAIEIL SQGDEQSPYI HKEIINVPIV GKVTAGQPIL AVENIEDTFP LPIDFVDSES 130 140 150 160 170 180 TFILTVKGDS MIDDGIHEND YVVVRQQSDA RNGDIVVALI DDSATVKRFY REKDHIRLQP 190 200 SNTSMSPILV DDVTILGKVT GVFRKI

References

[1]

"Complete sequence of Alkaliphilus metalliredigens QYMF." Copeland A., Lucas S., Lapidus A., Barry K., Detter J.C., Glavina del Rio T., Hammon N., Israni S., Dalin E., Tice H., Pitluck S., Chertkov O., Brettin T., Bruce D., Han C., Schmutz J., Larimer F., Land M. , Hauser L., Kyrpides N., Mikhailova N., Ye Q., Zhou J., Fields M., Richardson P. Submitted (JUN-2007) to the EMBL/GenBank/DDBJ databases Cited for: NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].

Cross-references

Sequence databases
EMBLGenBankDDBJ	CP000724 Genomic DNA. Translation: ABR48688.1.
RefSeq	YP_001320347.1.
3D structure databases
ModBase	Search...
Protein-protein interaction databases
STRING	A6TR70.
Genome annotation databases
GeneID	5312607.
GenomeReviews	Gene locus Amet_2535 in contig CP000724_GR.
KEGG	amt:Amet_2535.
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_ALKMQ

Accession

Primary (citable) accession number: A6TR70

Entry history

Integrated into UniProtKB/Swiss-Prot:	February 5, 2008
Last sequence update:	August 21, 2007
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)