ID   LUXS_DESPS              Reviewed;         159 AA.
AC   Q6AQW6;
DT   15-MAR-2005, integrated into UniProtKB/Swiss-Prot.
DT   13-SEP-2004, sequence version 1.
DT   03-AUG-2022, entry version 92.
DE   RecName: Full=S-ribosylhomocysteine lyase {ECO:0000255|HAMAP-Rule:MF_00091};
DE            EC=4.4.1.21 {ECO:0000255|HAMAP-Rule:MF_00091};
DE   AltName: Full=AI-2 synthesis protein {ECO:0000255|HAMAP-Rule:MF_00091};
DE   AltName: Full=Autoinducer-2 production protein LuxS {ECO:0000255|HAMAP-Rule:MF_00091};
GN   Name=luxS {ECO:0000255|HAMAP-Rule:MF_00091}; OrderedLocusNames=DP0529;
OS   Desulfotalea psychrophila (strain LSv54 / DSM 12343).
OC   Bacteria; Proteobacteria; Deltaproteobacteria; Desulfobacterales;
OC   Desulfocapsaceae; Desulfotalea.
OX   NCBI_TaxID=177439;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=DSM 12343 / LSv54;
RX   PubMed=15305914; DOI=10.1111/j.1462-2920.2004.00665.x;
RA   Rabus R., Ruepp A., Frickey T., Rattei T., Fartmann B., Stark M., Bauer M.,
RA   Zibat A., Lombardot T., Becker I., Amann J., Gellner K., Teeling H.,
RA   Leuschner W.D., Gloeckner F.-O., Lupas A.N., Amann R., Klenk H.-P.;
RT   "The genome of Desulfotalea psychrophila, a sulfate-reducing bacterium from
RT   permanently cold Arctic sediments.";
RL   Environ. Microbiol. 6:887-902(2004).
CC   -!- FUNCTION: Involved in the synthesis of autoinducer 2 (AI-2) which is
CC       secreted by bacteria and is used to communicate both the cell density
CC       and the metabolic potential of the environment. The regulation of gene
CC       expression in response to changes in cell density is called quorum
CC       sensing. Catalyzes the transformation of S-ribosylhomocysteine (RHC) to
CC       homocysteine (HC) and 4,5-dihydroxy-2,3-pentadione (DPD).
CC       {ECO:0000255|HAMAP-Rule:MF_00091}.
CC   -!- CATALYTIC ACTIVITY:
CC       Reaction=S-(5-deoxy-D-ribos-5-yl)-L-homocysteine = (S)-4,5-
CC         dihydroxypentane-2,3-dione + L-homocysteine; Xref=Rhea:RHEA:17753,
CC         ChEBI:CHEBI:29484, ChEBI:CHEBI:58195, ChEBI:CHEBI:58199; EC=4.4.1.21;
CC         Evidence={ECO:0000255|HAMAP-Rule:MF_00091};
CC   -!- COFACTOR:
CC       Name=Fe cation; Xref=ChEBI:CHEBI:24875;
CC         Evidence={ECO:0000255|HAMAP-Rule:MF_00091};
CC       Note=Binds 1 Fe cation per subunit. {ECO:0000255|HAMAP-Rule:MF_00091};
CC   -!- SUBUNIT: Homodimer. {ECO:0000255|HAMAP-Rule:MF_00091}.
CC   -!- SIMILARITY: Belongs to the LuxS family. {ECO:0000255|HAMAP-
CC       Rule:MF_00091}.
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DR   EMBL; CR522870; CAG35258.1; -; Genomic_DNA.
DR   RefSeq; WP_011187774.1; NC_006138.1.
DR   AlphaFoldDB; Q6AQW6; -.
DR   SMR; Q6AQW6; -.
DR   STRING; 177439.DP0529; -.
DR   EnsemblBacteria; CAG35258; CAG35258; DP0529.
DR   KEGG; dps:DP0529; -.
DR   eggNOG; COG1854; Bacteria.
DR   HOGENOM; CLU_107531_1_0_7; -.
DR   OMA; GPMGCLT; -.
DR   OrthoDB; 1779617at2; -.
DR   Proteomes; UP000000602; Chromosome.
DR   GO; GO:0005506; F:iron ion binding; IEA:InterPro.
DR   GO; GO:0043768; F:S-ribosylhomocysteine lyase activity; IEA:UniProtKB-UniRule.
DR   GO; GO:0009372; P:quorum sensing; IEA:UniProtKB-UniRule.
DR   Gene3D; 3.30.1360.80; -; 1.
DR   HAMAP; MF_00091; LuxS; 1.
DR   InterPro; IPR037005; LuxS_sf.
DR   InterPro; IPR011249; Metalloenz_LuxS/M16.
DR   InterPro; IPR003815; S-ribosylhomocysteinase.
DR   PANTHER; PTHR35799; PTHR35799; 1.
DR   Pfam; PF02664; LuxS; 1.
DR   PIRSF; PIRSF006160; AI2; 1.
DR   PRINTS; PR01487; LUXSPROTEIN.
DR   SUPFAM; SSF63411; SSF63411; 1.
PE   3: Inferred from homology;
KW   Autoinducer synthesis; Iron; Lyase; Metal-binding; Quorum sensing;
KW   Reference proteome.
FT   CHAIN           1..159
FT                   /note="S-ribosylhomocysteine lyase"
FT                   /id="PRO_0000172219"
FT   BINDING         53
FT                   /ligand="Fe cation"
FT                   /ligand_id="ChEBI:CHEBI:24875"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00091"
FT   BINDING         57
FT                   /ligand="Fe cation"
FT                   /ligand_id="ChEBI:CHEBI:24875"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00091"
FT   BINDING         124
FT                   /ligand="Fe cation"
FT                   /ligand_id="ChEBI:CHEBI:24875"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00091"
SQ   SEQUENCE   159 AA;  17846 MW;  F162301579320BF7 CRC64;
     MEKIASFTID HTKLKRGVYV SRQDKVAGNV ITTFDLRLKE PNNEPALDGA ASHTIEHIGA
     TFLRNHKTWA DRTIYFGPMG CQTGFYLILA GDWKAKDIVP LMQEMFAYVA QFTGTIPGES
     AVECGNFRFM DLIQAKEEAG KYFTEVLDNI AEKNLSYPS