Q5QHW1 (LUXS_LACRE) Reviewed, UniProtKB/Swiss-Prot

Names and origin

Protein names

Recommended name:
S-ribosylhomocysteine lyase
EC=4.4.1.21

Alternative name(s):
AI-2 synthesis protein
Autoinducer-2 production protein LuxS

Gene names

Name:

luxS

Organism

Lactobacillus reuteri

Taxonomic identifier

1598 [NCBI]

Taxonomic lineage

cellular organisms › Bacteria › Firmicutes › Bacilli › Lactobacillales › Lactobacillaceae › Lactobacillus

Protein attributes

Sequence length	158 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-Rule MF_00091
Catalytic activity	S-(5-deoxy-D-ribos-5-yl)-L-homocysteine = L-homocysteine + (4S)-4,5-dihydroxypentan-2,3-dione. HAMAP-Rule 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
Gene Ontology (GO)
Biological_process	metabolic process Inferred from electronic annotation. Source: GOC 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: InterPro
Complete GO annotation...

Sequence annotation (Features)

	Feature key	Position(s)	Length	Description	Graphical view	Feature identifier
Molecule processing
	Chain	1 – 158	158	S-ribosylhomocysteine lyase HAMAP-Rule MF_00091		PRO_0000172234
Sites
	Metal binding	54	1	Iron By similarity
	Metal binding	58	1	Iron By similarity
	Metal binding	124	1	Iron By similarity

Sequences

	Sequence		Length	Mass (Da)
	Q5QHW1 [UniParc]. Last modified January 4, 2005. Version 1. Checksum: 0D2A4178282B18E6	FASTA	158	17,727
	10 20 30 40 50 60 MAKVESFTLD HTKVKAPYVR LITVEEGAKG DKISNYDLRL VQPNENAIPT AGLHTIEHLL 70 80 90 100 110 120 AGLLRDRLDG VIDCSPFGCR TGFHLITWGE HSTTEVAKAL KSSLEEIAYK TKWEDVQGTT 130 140 150 IESCGNYRDH SLFSAKEWSK KILDEGISDK PFERHVVD

References

[1]	"LuxS sequence of Lactobacillus reuteri 100-23." Ghazally S., Walter J., Tannock G.W. Submitted (NOV-2003) to the EMBL/GenBank/DDBJ databases Cited for: NUCLEOTIDE SEQUENCE [GENOMIC DNA]. Strain: 100-23.

Cross-references

Sequence databases
EMBL GenBank DDBJ	AY485153 Genomic DNA. Translation: AAS48489.1.
3D structure databases
ProteinModelPortal	Q5QHW1.
ModBase	Search...
Protocols and materials databases
StructuralBiologyKnowledgebase	Search...
Genome annotation databases
PATRIC	26516164. VBILacReu112121_0799.
Family and domain databases
Gene3D	3.30.1360.80. 1 hit.
HAMAP	MF_00091. LuxS.
InterPro	IPR011249. Metalloenz_LuxS/M16. IPR003815. S-ribosylhomocysteinase. [Graphical view]
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]
SUPFAM	SSF63411. Metalloenz_metal-bd. 1 hit.
ProtoNet	Search...

Entry information

Entry name

LUXS_LACRE

Accession

Primary (citable) accession number: Q5QHW1

Entry history

Integrated into UniProtKB/Swiss-Prot:	March 15, 2005
Last sequence update:	January 4, 2005
Last modified:	April 3, 2013
This is version 38 of the entry and version 1 of the sequence. [Complete history]

Entry status

Reviewed (UniProtKB/Swiss-Prot)

Annotation program

Prokaryotic Protein Annotation Program