Reviewed, UniProtKB/Swiss-Prot B7JBX0 (LEXA_ACIF2)

Names and origin

Protein names

Recommended name:
    LexA repressor
    EC=3.4.21.88

Gene names

Name:	lexA
Ordered Locus Names:	AFE_1868

Organism

Acidithiobacillus ferrooxidans (strain ATCC 23270 / DSM 14882 / NCIB 8455) (Ferrobacillus ferrooxidans (strain ATCC 23270)) [Complete proteome] [HAMAP]

Taxonomic identifier

243159 [NCBI]

Taxonomic lineage

Bacteria › Proteobacteria › Gammaproteobacteria › Acidithiobacillales › Acidithiobacillaceae › Acidithiobacillus

Protein attributes

Sequence length	205 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 – 205	205	LexA repressor HAMAP MF_00015		PRO_1000192763
Regions
	DNA binding	28 – 48	21	H-T-H motif By similarity
Sites
	Active site	120	1	For autocatalytic cleavage activity By similarity
	Active site	159	1	For autocatalytic cleavage activity By similarity
	Site	85 – 86	2	Cleavage; by autolysis By similarity

Sequences

	Sequence		Length	Mass (Da)
	B7JBX0-1 [UniParc]. Last modified February 10, 2009. Version 1. Checksum: 2B87862389A3461E	FASTA	205	22,626
	10 20 30 40 50 60 MDELTPRQSE ILAWIRARMA EDSLPPTRAE LMRAFDFRSP NAAESHLRVL ARKGYILLQS 70 80 90 100 110 120 GTARGIRLCA SEEETGLPLI GRVAAGQPML AEEFREGQLP VDPKLFSPGA DYLLRVQGMS 130 140 150 160 170 180 MRDAGILDGD ILAVRHDASL TLQDGQMVVA RVNGEVTVKR WKRDGKQVWL LPENPDFSPI 190 200 SVDLQRDSLT IEGVVVGLLR IGGNL

References

[1]

"Acidithiobacillus ferrooxidans metabolism: from genome sequence to industrial applications." Valdes J., Pedroso I., Quatrini R., Dodson R.J., Tettelin H., Blake R. II, Eisen J.A., Holmes D.S. BMC Genomics 9:597-597(2008) [PubMed: 19077236] [Abstract] Cited for: NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].

Cross-references

Sequence databases
EMBLGenBankDDBJ	CP001219 Genomic DNA. Translation: ACK78330.1.
RefSeq	YP_002426282.1.
3D structure databases
ModBase	Search...
Genome annotation databases
GeneID	7136581.
GenomeReviews	Gene locus AFE_1868 in contig CP001219_GR.
KEGG	afr:AFE_1868.
Organism-specific databases
CMR	Search...
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_ACIF2

Accession

Primary (citable) accession number: B7JBX0

Entry history

Integrated into UniProtKB/Swiss-Prot:	April 14, 2009
Last sequence update:	February 10, 2009
Last modified:	October 13, 2009
This is version 10 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)