Reviewed, UniProtKB/Swiss-Prot B1YKZ3 (LUXS_EXIS2)

Names and origin

Protein names

Recommended name:
    S-ribosylhomocysteine lyase
    EC=4.4.1.21
Alternative name(s):
    Autoinducer-2 production protein luxS
    AI-2 synthesis protein

Gene names

Name:	luxS
Ordered Locus Names:	Exig_2345

Organism

Exiguobacterium sibiricum (strain DSM 17290 / JCM 13490 / 255-15) [Complete proteome] [HAMAP]

Taxonomic identifier

262543 [NCBI]

Taxonomic lineage

Bacteria › Firmicutes › Bacillales › Bacillales Family XII. Incertae Sedis › Exiguobacterium

Protein attributes

Sequence length	154 AA.
Sequence status	Complete.
Sequence processing	The displayed sequence is not processed.
Protein existence	Inferred from homology.

General annotation (Comments)

Function	Involved in the synthesis of autoinducer 2 (AI-2) which is secreted by bacteria and is used to communicate both the cell density and the metabolic potential of the environment. The regulation of gene expression in response to changes in cell density is called quorum sensing. Catalyzes the transformation of S-ribosylhomocysteine (RHC) to homocysteine (HC) and 4,5-dihydroxy-2,3-pentadione (DPD) By similarity.
Catalytic activity	S-(5-deoxy-D-ribos-5-yl)-L-homocysteine = L-homocysteine + (4S)-4,5-dihydroxypentan-2,3-dione. HAMAP MF_00091
Cofactor	Binds 1 iron ion per subunit By similarity.
Subunit structure	Homodimer By similarity.
Sequence similarities	Belongs to the luxS family.

Ontologies

Keywords
Biological process	Autoinducer synthesis Quorum sensing
Ligand	Iron Metal-binding
Molecular function	Lyase
Technical term	Complete proteome
Gene Ontology (GO)
Biological process	quorum sensing Inferred from electronic annotation. Source: HAMAP
Molecular function	S-ribosylhomocysteine lyase activity Inferred from electronic annotation. Source: HAMAP iron ion binding Inferred from electronic annotation. Source: UniProtKB-KW
Complete GO annotation...

Sequence annotation (Features)

	Feature key	Position(s)	Length	Description	Graphical view	Feature identifier
Molecule processing
	Chain	1 – 154	154	S-ribosylhomocysteine lyase HAMAP MF_00091		PRO_1000093307
Sites
	Metal binding	57	1	Iron By similarity
	Metal binding	61	1	Iron By similarity
	Metal binding	124	1	Iron By similarity

Sequences

	Sequence		Length	Mass (Da)
	B1YKZ3-1 [UniParc]. Last modified May 20, 2008. Version 1. Checksum: 9768A7A6B2E27131	FASTA	154	17,540
	10 20 30 40 50 60 MTIKKMNVES FNLDHTKVKA PYIRVAGYKD GKVDQVVKYD IRFTQPNVEQ MPMRAMHTLE 70 80 90 100 110 120 HLLAENIRNY SDDVIDVSPM GCQTGFYMAM MNFDSVEKMS ELVEKTLKDV LAAEEIPAQN 130 140 150 EVQCGFASAH DLKGAKHYAE KMLAGRDEWD IVFG

References

[1]

"Complete sequence of chromosome of Exiguobacterium sibiricum 255-15." Copeland A., Lucas S., Lapidus A., Glavina del Rio T., Dalin E., Tice H., Bruce D., Goodwin L., Pitluck S., Kiss H., Chertkov O., Monk C., Brettin T., Detter J.C., Han C., Kuske C.R., Schmutz J., Larimer F. , Land M., Hauser L., Kyrpides N., Mikhailova N., Vishnivetskaya T., Rodrigues D.F., Gilichinsky D., Tiedje J., Richardson P. Submitted (APR-2008) to the EMBL/GenBank/DDBJ databases Cited for: NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].

Cross-references

Sequence databases
EMBLGenBankDDBJ	CP001022 Genomic DNA. Translation: ACB61795.1.
RefSeq	YP_001814812.1.
3D structure databases
ModBase	Search...
Genome annotation databases
GeneID	6175326.
GenomeReviews	Gene locus Exig_2345 in contig CP001022_GR.
KEGG	esi:Exig_2345.
Organism-specific databases
CMR	Search...
Phylogenomic databases
OMA	VRIAKTM.
Family and domain databases
HAMAP	MF_00091. [Tree]
InterPro	IPR003815. S-ribosylhomocysteinase. [Graphical view]
Gene3D	G3DSA:3.30.1360.80. S-ribosylhomocysteinase. 1 hit.
Pfam	PF02664. LuxS. 1 hit. [Graphical view]
PIRSF	PIRSF006160. AI2. 1 hit.
PRINTS	PR01487. LUXSPROTEIN.
ProtoNet	Search...

Entry information

Entry name

LUXS_EXIS2

Accession

Primary (citable) accession number: B1YKZ3

Entry history

Integrated into UniProtKB/Swiss-Prot:	March 24, 2009
Last sequence update:	May 20, 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)