Reviewed, UniProtKB/Swiss-Prot B4S1W7 (LEXA_ALTMD)

Names and origin

Protein names

Recommended name:
    LexA repressor
    EC=3.4.21.88

Gene names

Name:	lexA
Ordered Locus Names:	MADE_04014

Organism

Alteromonas macleodii (strain DSM 17117 / Deep ecotype) [Complete proteome] [HAMAP]

Taxonomic identifier

314275 [NCBI]

Taxonomic lineage

Bacteria › Proteobacteria › Gammaproteobacteria › Alteromonadales › Alteromonadaceae › Alteromonas

Protein attributes

Sequence length	208 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 – 208	208	LexA repressor HAMAP MF_00015		PRO_1000089543
Regions
	DNA binding	28 – 48	21	H-T-H motif By similarity
Sites
	Active site	125	1	For autocatalytic cleavage activity By similarity
	Active site	162	1	For autocatalytic cleavage activity By similarity
	Site	90 – 91	2	Cleavage; by autolysis By similarity

Sequences

	Sequence		Length	Mass (Da)
	B4S1W7-1 [UniParc]. Last modified September 23, 2008. Version 1. Checksum: 951DB715DC683771	FASTA	208	22,976
	10 20 30 40 50 60 MRPLTARQTE VLELIKTTMQ ETGMPPTRAE IARQLGFRSA NAAEEHLKAL ARKGVIEILP 70 80 90 100 110 120 GTSRGIKLNI PLDNEAEEEE GLPLIGRVAA GEPILAQEHV ESHYKVDPAL FQPQADFLLR 130 140 150 160 170 180 VNGMSMKDIG ILDGDLLAVH RTTDVHNGQV VVARVDEDVT VKRLEKRGRE VLLHAENEEF 190 200 SPIKVDLANE PFAIEGIAVG VIRNADWM

References

[1]

"Comparative genomics of two ecotypes of the marine planktonic copiotroph Alteromonas macleodii suggests alternative lifestyles associated with different kinds of particulate organic matter." Ivars-Martinez E., Martin-Cuadrado A.-B., D'Auria G., Mira A., Ferriera S., Johnson J., Friedman R., Rodriguez-Valera F. ISME J. 2:1194-1212(2008) [PubMed: 18670397] [Abstract] Cited for: NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].

Cross-references

Sequence databases
EMBLGenBankDDBJ	CP001103 Genomic DNA. Translation: ACG68304.1.
RefSeq	YP_002128298.1.
3D structure databases
ModBase	Search...
Protein family/group databases
MEROPS	S24.001.
Genome annotation databases
GeneID	6778632.
GenomeReviews	Gene locus MADE_04014 in contig CP001103_GR.
KEGG	amc:MADE_04014.
Organism-specific databases
CMR	Search...
Phylogenomic databases
OMA	FRITPRG.
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_ALTMD

Accession

Primary (citable) accession number: B4S1W7

Entry history

Integrated into UniProtKB/Swiss-Prot:	March 24, 2009
Last sequence update:	September 23, 2008
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)