RISB_THEON
ID RISB_THEON Reviewed; 152 AA.
AC B6YUQ8;
DT 24-MAR-2009, integrated into UniProtKB/Swiss-Prot.
DT 20-JAN-2009, sequence version 1.
DT 03-AUG-2022, entry version 82.
DE RecName: Full=6,7-dimethyl-8-ribityllumazine synthase {ECO:0000255|HAMAP-Rule:MF_00178};
DE Short=DMRL synthase {ECO:0000255|HAMAP-Rule:MF_00178};
DE Short=LS {ECO:0000255|HAMAP-Rule:MF_00178};
DE Short=Lumazine synthase {ECO:0000255|HAMAP-Rule:MF_00178};
DE EC=2.5.1.78 {ECO:0000255|HAMAP-Rule:MF_00178};
GN Name=ribH {ECO:0000255|HAMAP-Rule:MF_00178}; OrderedLocusNames=TON_0607;
OS Thermococcus onnurineus (strain NA1).
OC Archaea; Euryarchaeota; Thermococci; Thermococcales; Thermococcaceae;
OC Thermococcus.
OX NCBI_TaxID=523850;
RN [1]
RP NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC STRAIN=NA1;
RX PubMed=18790866; DOI=10.1128/jb.00746-08;
RA Lee H.S., Kang S.G., Bae S.S., Lim J.K., Cho Y., Kim Y.J., Jeon J.H.,
RA Cha S.-S., Kwon K.K., Kim H.-T., Park C.-J., Lee H.-W., Kim S.I., Chun J.,
RA Colwell R.R., Kim S.-J., Lee J.-H.;
RT "The complete genome sequence of Thermococcus onnurineus NA1 reveals a
RT mixed heterotrophic and carboxydotrophic metabolism.";
RL J. Bacteriol. 190:7491-7499(2008).
CC -!- FUNCTION: Catalyzes the formation of 6,7-dimethyl-8-ribityllumazine by
CC condensation of 5-amino-6-(D-ribitylamino)uracil with 3,4-dihydroxy-2-
CC butanone 4-phosphate. This is the penultimate step in the biosynthesis
CC of riboflavin. {ECO:0000255|HAMAP-Rule:MF_00178}.
CC -!- CATALYTIC ACTIVITY:
CC Reaction=(2S)-2-hydroxy-3-oxobutyl phosphate + 5-amino-6-(D-
CC ribitylamino)uracil = 6,7-dimethyl-8-(1-D-ribityl)lumazine + H(+) + 2
CC H2O + phosphate; Xref=Rhea:RHEA:26152, ChEBI:CHEBI:15377,
CC ChEBI:CHEBI:15378, ChEBI:CHEBI:15934, ChEBI:CHEBI:43474,
CC ChEBI:CHEBI:58201, ChEBI:CHEBI:58830; EC=2.5.1.78;
CC Evidence={ECO:0000255|HAMAP-Rule:MF_00178};
CC -!- PATHWAY: Cofactor biosynthesis; riboflavin biosynthesis; riboflavin
CC from 2-hydroxy-3-oxobutyl phosphate and 5-amino-6-(D-
CC ribitylamino)uracil: step 1/2. {ECO:0000255|HAMAP-Rule:MF_00178}.
CC -!- SIMILARITY: Belongs to the DMRL synthase family. {ECO:0000255|HAMAP-
CC Rule:MF_00178}.
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DR EMBL; CP000855; ACJ16094.1; -; Genomic_DNA.
DR RefSeq; WP_012571566.1; NC_011529.1.
DR AlphaFoldDB; B6YUQ8; -.
DR SMR; B6YUQ8; -.
DR STRING; 523850.TON_0607; -.
DR EnsemblBacteria; ACJ16094; ACJ16094; TON_0607.
DR GeneID; 7016905; -.
DR KEGG; ton:TON_0607; -.
DR PATRIC; fig|523850.10.peg.608; -.
DR eggNOG; arCOG01323; Archaea.
DR HOGENOM; CLU_089358_1_1_2; -.
DR OMA; CQGVTQG; -.
DR OrthoDB; 88531at2157; -.
DR UniPathway; UPA00275; UER00404.
DR Proteomes; UP000002727; Chromosome.
DR GO; GO:0009349; C:riboflavin synthase complex; IEA:InterPro.
DR GO; GO:0000906; F:6,7-dimethyl-8-ribityllumazine synthase activity; IEA:UniProtKB-UniRule.
DR GO; GO:0009231; P:riboflavin biosynthetic process; IEA:UniProtKB-UniRule.
DR CDD; cd09209; Lumazine_synthase-I; 1.
DR Gene3D; 3.40.50.960; -; 1.
DR HAMAP; MF_00178; Lumazine_synth; 1.
DR InterPro; IPR034964; LS.
DR InterPro; IPR002180; LS/RS.
DR InterPro; IPR036467; LS/RS_sf.
DR PANTHER; PTHR21058; PTHR21058; 1.
DR Pfam; PF00885; DMRL_synthase; 1.
DR SUPFAM; SSF52121; SSF52121; 1.
DR TIGRFAMs; TIGR00114; lumazine-synth; 1.
PE 3: Inferred from homology;
KW Riboflavin biosynthesis; Transferase.
FT CHAIN 1..152
FT /note="6,7-dimethyl-8-ribityllumazine synthase"
FT /id="PRO_1000098242"
FT ACT_SITE 88
FT /note="Proton donor"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_00178"
FT BINDING 24
FT /ligand="5-amino-6-(D-ribitylamino)uracil"
FT /ligand_id="ChEBI:CHEBI:15934"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_00178"
FT BINDING 56..58
FT /ligand="5-amino-6-(D-ribitylamino)uracil"
FT /ligand_id="ChEBI:CHEBI:15934"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_00178"
FT BINDING 80..82
FT /ligand="5-amino-6-(D-ribitylamino)uracil"
FT /ligand_id="ChEBI:CHEBI:15934"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_00178"
FT BINDING 85..86
FT /ligand="(2S)-2-hydroxy-3-oxobutyl phosphate"
FT /ligand_id="ChEBI:CHEBI:58830"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_00178"
FT BINDING 113
FT /ligand="5-amino-6-(D-ribitylamino)uracil"
FT /ligand_id="ChEBI:CHEBI:15934"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_00178"
FT BINDING 127
FT /ligand="(2S)-2-hydroxy-3-oxobutyl phosphate"
FT /ligand_id="ChEBI:CHEBI:58830"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_00178"
SQ SEQUENCE 152 AA; 16385 MW; E4B5F35A98A59BC7 CRC64;
MEVRVFEGEF KGDGLSMAIV VARFNDLLTD ELLSGAIDCF ERHGVERVDV FKVPGSFEIP
IIAKKLAESG KYDAILALGV VVRGETKHFD LVANEVSKGV AQAGLITGVP VIFGVIAVED
ELQGLNRAGI KSNKGFEYAM AALEMANLMK KL
