Reviewed, UniProtKB/Swiss-Prot Q8G568 (LUXS_BIFLO)

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:	BL1152

Organism

Bifidobacterium longum [Complete proteome] [HAMAP]

Taxonomic identifier

216816 [NCBI]

Taxonomic lineage

Bacteria › Actinobacteria › Actinobacteridae › Bifidobacteriales › Bifidobacteriaceae › Bifidobacterium

Protein attributes

Sequence length	164 AA.
Sequence status	Complete.
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. HAMAP MF_00091
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. HAMAP MF_00091
Subunit structure	Homodimer By similarity. HAMAP MF_00091
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 – 164	164	S-ribosylhomocysteine lyase HAMAP MF_00091		PRO_0000297985
Sites
	Metal binding	61	1	Iron By similarity
	Metal binding	65	1	Iron By similarity
	Metal binding	131	1	Iron By similarity

Sequences

	Sequence		Length	Mass (Da)
	Q8G568-1 [UniParc]. Last modified August 21, 2007. Version 2. Checksum: CDC4BD9D1BAA57E5	FASTA	164	18,451
	10 20 30 40 50 60 MAEETAEKPV VESFQLDHTK VKAPYVRYID TETGPHGDVI SNYDLRLTQP NEQAIPTGGL 70 80 90 100 110 120 HTIEHTIAVL LRERIPGYID CSPFGCRTGF HLLTWGTHST EDVAKALKES LEFIAYKATW 130 140 150 160 DDVPATTEKS CGNYRDHSLF TAKEWAKLIL EEGISSDPFE RKVV

References

[1]

"The genome sequence of Bifidobacterium longum reflects its adaptation to the human gastrointestinal tract." Schell M.A., Karmirantzou M., Snel B., Vilanova D., Berger B., Pessi G., Zwahlen M.-C., Desiere F., Bork P., Delley M., Pridmore R.D., Arigoni F. Proc. Natl. Acad. Sci. U.S.A. 99:14422-14427(2002) [PubMed: 12381787] [Abstract] Cited for: NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA]. Strain: NCC 2705.

Cross-references

Sequence databases
EMBL GenBank DDBJ	AE014295 Genomic DNA. Translation: AAN24957.1. Different initiation.
RefSeq	NP_696321.2.
3D structure databases
HSSP	HSSP built from PDB template 1VH2 based on UniProtKB Q9RRU8.
SMR	Q8G568. Positions 11-157.
ModBase	Search...
Genome annotation databases
GeneID	1022825.
GenomeReviews	Gene locus BL1152 in contig AE014295_GR.
KEGG	blo:BL1152.
NMPDR	fig|206672.1.peg.1088.
Organism-specific databases
CMR	Search...
Phylogenomic databases
HOGENOM	HBG347473.
OMA	VRIAKTM.
Enzyme and pathway databases
BioCyc	BLON206672:BL1152-MONOMER.
BRENDA	4.4.1.21. 39917.
Family and domain databases
HAMAP	MF_00091. LuxS. [Tree]
InterPro	IPR011249. Metalloenz_metal-bd. 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.
ProDom	PD013172. S-ribosylhomocysteinase. 1 hit. [Graphical view] [Entries sharing at least one domain]
ProtoNet	Search...

Entry information

Entry name

LUXS_BIFLO

Accession

Primary (citable) accession number: Q8G568

Entry history

Integrated into UniProtKB/Swiss-Prot:	August 21, 2007
Last sequence update:	August 21, 2007
Last modified:	January 19, 2010
This is version 36 of the entry and version 2 of the sequence. [Complete history]

Entry status

Reviewed (UniProtKB/Swiss-Prot)

Annotation project

HAMAP (High-quality Automated and Manual Annotation of microbial Proteomes)