RIBBA_BACFN
ID RIBBA_BACFN Reviewed; 404 AA.
AC Q5LHT1;
DT 28-JUL-2009, integrated into UniProtKB/Swiss-Prot.
DT 21-JUN-2005, sequence version 1.
DT 03-AUG-2022, entry version 99.
DE RecName: Full=Riboflavin biosynthesis protein RibBA {ECO:0000255|HAMAP-Rule:MF_01283};
DE Includes:
DE RecName: Full=3,4-dihydroxy-2-butanone 4-phosphate synthase {ECO:0000255|HAMAP-Rule:MF_01283};
DE Short=DHBP synthase {ECO:0000255|HAMAP-Rule:MF_01283};
DE EC=4.1.99.12 {ECO:0000255|HAMAP-Rule:MF_01283};
DE Includes:
DE RecName: Full=GTP cyclohydrolase-2 {ECO:0000255|HAMAP-Rule:MF_01283};
DE EC=3.5.4.25 {ECO:0000255|HAMAP-Rule:MF_01283};
DE AltName: Full=GTP cyclohydrolase II {ECO:0000255|HAMAP-Rule:MF_01283};
GN Name=ribBA {ECO:0000255|HAMAP-Rule:MF_01283}; OrderedLocusNames=BF0544;
OS Bacteroides fragilis (strain ATCC 25285 / DSM 2151 / CCUG 4856 / JCM 11019
OS / NCTC 9343 / Onslow).
OC Bacteria; Bacteroidetes; Bacteroidia; Bacteroidales; Bacteroidaceae;
OC Bacteroides.
OX NCBI_TaxID=272559;
RN [1]
RP NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC STRAIN=ATCC 25285 / DSM 2151 / CCUG 4856 / JCM 11019 / NCTC 9343 / Onslow;
RX PubMed=15746427; DOI=10.1126/science.1107008;
RA Cerdeno-Tarraga A.-M., Patrick S., Crossman L.C., Blakely G., Abratt V.,
RA Lennard N., Poxton I., Duerden B., Harris B., Quail M.A., Barron A.,
RA Clark L., Corton C., Doggett J., Holden M.T.G., Larke N., Line A., Lord A.,
RA Norbertczak H., Ormond D., Price C., Rabbinowitsch E., Woodward J.,
RA Barrell B.G., Parkhill J.;
RT "Extensive DNA inversions in the B. fragilis genome control variable gene
RT expression.";
RL Science 307:1463-1465(2005).
CC -!- FUNCTION: Catalyzes the conversion of D-ribulose 5-phosphate to formate
CC and 3,4-dihydroxy-2-butanone 4-phosphate. {ECO:0000255|HAMAP-
CC Rule:MF_01283}.
CC -!- FUNCTION: Catalyzes the conversion of GTP to 2,5-diamino-6-
CC ribosylamino-4(3H)-pyrimidinone 5'-phosphate (DARP), formate and
CC pyrophosphate. {ECO:0000255|HAMAP-Rule:MF_01283}.
CC -!- CATALYTIC ACTIVITY:
CC Reaction=D-ribulose 5-phosphate = (2S)-2-hydroxy-3-oxobutyl phosphate +
CC formate + H(+); Xref=Rhea:RHEA:18457, ChEBI:CHEBI:15378,
CC ChEBI:CHEBI:15740, ChEBI:CHEBI:58121, ChEBI:CHEBI:58830;
CC EC=4.1.99.12; Evidence={ECO:0000255|HAMAP-Rule:MF_01283};
CC -!- CATALYTIC ACTIVITY:
CC Reaction=GTP + 4 H2O = 2,5-diamino-6-hydroxy-4-(5-phosphoribosylamino)-
CC pyrimidine + formate + 3 H(+) + 2 phosphate; Xref=Rhea:RHEA:23704,
CC ChEBI:CHEBI:15377, ChEBI:CHEBI:15378, ChEBI:CHEBI:15740,
CC ChEBI:CHEBI:37565, ChEBI:CHEBI:43474, ChEBI:CHEBI:58614; EC=3.5.4.25;
CC Evidence={ECO:0000255|HAMAP-Rule:MF_01283};
CC -!- COFACTOR:
CC Name=Mg(2+); Xref=ChEBI:CHEBI:18420;
CC Evidence={ECO:0000255|HAMAP-Rule:MF_01283};
CC Name=Mn(2+); Xref=ChEBI:CHEBI:29035;
CC Evidence={ECO:0000255|HAMAP-Rule:MF_01283};
CC Note=Binds 2 divalent metal cations per subunit. Magnesium or
CC manganese. {ECO:0000255|HAMAP-Rule:MF_01283};
CC -!- COFACTOR:
CC Name=Zn(2+); Xref=ChEBI:CHEBI:29105;
CC Evidence={ECO:0000255|HAMAP-Rule:MF_01283};
CC Note=Binds 1 zinc ion per subunit. {ECO:0000255|HAMAP-Rule:MF_01283};
CC -!- PATHWAY: Cofactor biosynthesis; riboflavin biosynthesis; 2-hydroxy-3-
CC oxobutyl phosphate from D-ribulose 5-phosphate: step 1/1.
CC {ECO:0000255|HAMAP-Rule:MF_01283}.
CC -!- PATHWAY: Cofactor biosynthesis; riboflavin biosynthesis; 5-amino-6-(D-
CC ribitylamino)uracil from GTP: step 1/4. {ECO:0000255|HAMAP-
CC Rule:MF_01283}.
CC -!- SIMILARITY: In the N-terminal section; belongs to the DHBP synthase
CC family. {ECO:0000255|HAMAP-Rule:MF_01283}.
CC -!- SIMILARITY: In the C-terminal section; belongs to the GTP
CC cyclohydrolase II family. {ECO:0000255|HAMAP-Rule:MF_01283}.
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DR EMBL; CR626927; CAH06299.1; -; Genomic_DNA.
DR RefSeq; WP_005784515.1; NC_003228.3.
DR AlphaFoldDB; Q5LHT1; -.
DR SMR; Q5LHT1; -.
DR STRING; 272559.BF9343_0520; -.
DR EnsemblBacteria; CAH06299; CAH06299; BF9343_0520.
DR GeneID; 66330368; -.
DR KEGG; bfs:BF9343_0520; -.
DR eggNOG; COG0108; Bacteria.
DR eggNOG; COG0807; Bacteria.
DR HOGENOM; CLU_020273_1_2_10; -.
DR OMA; ECRGLIC; -.
DR OrthoDB; 900513at2; -.
DR UniPathway; UPA00275; UER00399.
DR UniPathway; UPA00275; UER00400.
DR Proteomes; UP000006731; Chromosome.
DR GO; GO:0008686; F:3,4-dihydroxy-2-butanone-4-phosphate synthase activity; IEA:UniProtKB-UniRule.
DR GO; GO:0005525; F:GTP binding; IEA:UniProtKB-KW.
DR GO; GO:0003935; F:GTP cyclohydrolase II activity; IEA:UniProtKB-UniRule.
DR GO; GO:0000287; F:magnesium ion binding; IEA:UniProtKB-UniRule.
DR GO; GO:0030145; F:manganese ion binding; IEA:UniProtKB-UniRule.
DR GO; GO:0008270; F:zinc ion binding; IEA:UniProtKB-UniRule.
DR GO; GO:0009231; P:riboflavin biosynthetic process; IEA:UniProtKB-UniRule.
DR CDD; cd00641; GTP_cyclohydro2; 1.
DR Gene3D; 3.40.50.10990; -; 1.
DR HAMAP; MF_00179; RibA; 1.
DR HAMAP; MF_00180; RibB; 1.
DR HAMAP; MF_01283; RibBA; 1.
DR InterPro; IPR017945; DHBP_synth_RibB-like_a/b_dom.
DR InterPro; IPR000422; DHBP_synthase_RibB.
DR InterPro; IPR032677; GTP_cyclohydro_II.
DR InterPro; IPR000926; RibA.
DR InterPro; IPR036144; RibA-like_sf.
DR InterPro; IPR016299; Riboflavin_synth_RibBA.
DR Pfam; PF00926; DHBP_synthase; 1.
DR Pfam; PF00925; GTP_cyclohydro2; 1.
DR SUPFAM; SSF142695; SSF142695; 1.
DR SUPFAM; SSF55821; SSF55821; 1.
DR TIGRFAMs; TIGR00505; ribA; 1.
DR TIGRFAMs; TIGR00506; ribB; 1.
PE 3: Inferred from homology;
KW GTP-binding; Hydrolase; Lyase; Magnesium; Manganese; Metal-binding;
KW Multifunctional enzyme; Nucleotide-binding; Reference proteome;
KW Riboflavin biosynthesis; Zinc.
FT CHAIN 1..404
FT /note="Riboflavin biosynthesis protein RibBA"
FT /id="PRO_1000165246"
FT REGION 1..204
FT /note="DHBP synthase"
FT REGION 205..404
FT /note="GTP cyclohydrolase II"
FT ACT_SITE 332
FT /note="Proton acceptor; for GTP cyclohydrolase activity"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01283"
FT ACT_SITE 334
FT /note="Nucleophile; for GTP cyclohydrolase activity"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01283"
FT BINDING 30..31
FT /ligand="D-ribulose 5-phosphate"
FT /ligand_id="ChEBI:CHEBI:58121"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01283"
FT BINDING 31
FT /ligand="Mg(2+)"
FT /ligand_id="ChEBI:CHEBI:18420"
FT /ligand_label="1"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01283"
FT BINDING 31
FT /ligand="Mg(2+)"
FT /ligand_id="ChEBI:CHEBI:18420"
FT /ligand_label="2"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01283"
FT BINDING 35
FT /ligand="D-ribulose 5-phosphate"
FT /ligand_id="ChEBI:CHEBI:58121"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01283"
FT BINDING 143..147
FT /ligand="D-ribulose 5-phosphate"
FT /ligand_id="ChEBI:CHEBI:58121"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01283"
FT BINDING 146
FT /ligand="Mg(2+)"
FT /ligand_id="ChEBI:CHEBI:18420"
FT /ligand_label="2"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01283"
FT BINDING 167
FT /ligand="D-ribulose 5-phosphate"
FT /ligand_id="ChEBI:CHEBI:58121"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01283"
FT BINDING 255..259
FT /ligand="GTP"
FT /ligand_id="ChEBI:CHEBI:37565"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01283"
FT BINDING 260
FT /ligand="Zn(2+)"
FT /ligand_id="ChEBI:CHEBI:29105"
FT /ligand_note="catalytic"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01283"
FT BINDING 271
FT /ligand="Zn(2+)"
FT /ligand_id="ChEBI:CHEBI:29105"
FT /ligand_note="catalytic"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01283"
FT BINDING 273
FT /ligand="Zn(2+)"
FT /ligand_id="ChEBI:CHEBI:29105"
FT /ligand_note="catalytic"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01283"
FT BINDING 276
FT /ligand="GTP"
FT /ligand_id="ChEBI:CHEBI:37565"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01283"
FT BINDING 298..300
FT /ligand="GTP"
FT /ligand_id="ChEBI:CHEBI:37565"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01283"
FT BINDING 320
FT /ligand="GTP"
FT /ligand_id="ChEBI:CHEBI:37565"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01283"
FT BINDING 355
FT /ligand="GTP"
FT /ligand_id="ChEBI:CHEBI:37565"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01283"
FT BINDING 360
FT /ligand="GTP"
FT /ligand_id="ChEBI:CHEBI:37565"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01283"
FT SITE 129
FT /note="Essential for DHBP synthase activity"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01283"
FT SITE 167
FT /note="Essential for DHBP synthase activity"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01283"
SQ SEQUENCE 404 AA; 45101 MW; F456056CAA89C843 CRC64;
MEPIRLNTIE EAIADFKEGN FVIVVDDEDR ENEGDFIIAA EKITPEKVNF MLTHGRGVLC
APITEERCAE LELDMQVSSN TSIYETPFTV TVDLLEGCTT GVSMHDRAMT IRALADPKTK
PADLGRPGHI NPLRARSRGV LRRAGHTEAS VDLAKLAGLY PAAALIEIIN EDGTMARLPQ
LVEVARRFGL KIISIKDLIA YRLQMESIVD RGVEVDMPTQ FGHFRLIPFR QKSNGMEHIA
LIKGTWDTDE PILVRVHSSC MTGDIFGSCR CECGEQLHKA MEMIEAAGKG VIVYMNQEGR
GIGLMNKIAA YKLQEEGYDT VDANLHLGFD ADERDYGVGA QILREIGVKK MKLMTNNPVK
RIGLEAYGLE ITENVGIEIK PNPYNERYLK TKKDRMGHTL HFNK
