ID   D2RNY5_ACIFV            Unreviewed;       408 AA.
AC   D2RNY5;
DT   02-MAR-2010, integrated into UniProtKB/TrEMBL.
DT   02-MAR-2010, sequence version 1.
DT   27-MAR-2024, entry version 92.
DE   RecName: Full=Riboflavin biosynthesis protein RibBA {ECO:0000256|HAMAP-Rule:MF_01283};
DE   Includes:
DE     RecName: Full=3,4-dihydroxy-2-butanone 4-phosphate synthase {ECO:0000256|HAMAP-Rule:MF_01283};
DE              Short=DHBP synthase {ECO:0000256|HAMAP-Rule:MF_01283};
DE              EC=4.1.99.12 {ECO:0000256|HAMAP-Rule:MF_01283};
DE   Includes:
DE     RecName: Full=GTP cyclohydrolase-2 {ECO:0000256|HAMAP-Rule:MF_01283};
DE              EC=3.5.4.25 {ECO:0000256|HAMAP-Rule:MF_01283};
DE     AltName: Full=GTP cyclohydrolase II {ECO:0000256|HAMAP-Rule:MF_01283};
GN   Name=ribBA {ECO:0000256|HAMAP-Rule:MF_01283};
GN   OrderedLocusNames=Acfer_0355 {ECO:0000313|EMBL:ADB46761.1};
OS   Acidaminococcus fermentans (strain ATCC 25085 / DSM 20731 / CCUG 9996 / CIP
OS   106432 / VR4).
OC   Bacteria; Bacillota; Negativicutes; Acidaminococcales; Acidaminococcaceae;
OC   Acidaminococcus.
OX   NCBI_TaxID=591001 {ECO:0000313|EMBL:ADB46761.1, ECO:0000313|Proteomes:UP000001902};
RN   [1] {ECO:0000313|EMBL:ADB46761.1, ECO:0000313|Proteomes:UP000001902}
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=ATCC 25085 / DSM 20731 / CCUG 9996 / CIP 106432 / VR4
RC   {ECO:0000313|Proteomes:UP000001902};
RX   PubMed=21304687; DOI=10.4056/sigs.1002553;
RA   Chang Y.J., Pukall R., Saunders E., Lapidus A., Copeland A., Nolan M.,
RA   Glavina Del Rio T., Lucas S., Chen F., Tice H., Cheng J.F., Han C.,
RA   Detter J.C., Bruce D., Goodwin L., Pitluck S., Mikhailova N., Liolios K.,
RA   Pati A., Ivanova N., Mavromatis K., Chen A., Palaniappan K., Land M.,
RA   Hauser L., Jeffries C.D., Brettin T., Rohde M., Goker M., Bristow J.,
RA   Eisen J.A., Markowitz V., Hugenholtz P., Kyrpides N.C., Klenk H.P.;
RT   "Complete genome sequence of Acidaminococcus fermentans type strain
RT   (VR4).";
RL   Stand. Genomic Sci. 3:1-14(2010).
CC   -!- FUNCTION: Catalyzes the conversion of D-ribulose 5-phosphate to formate
CC       and 3,4-dihydroxy-2-butanone 4-phosphate.
CC       {ECO:0000256|ARBA:ARBA00002284, ECO:0000256|HAMAP-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:0000256|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:0000256|ARBA:ARBA00000141,
CC         ECO:0000256|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:0000256|ARBA:ARBA00029293, ECO:0000256|HAMAP-
CC         Rule:MF_01283};
CC   -!- COFACTOR:
CC       Name=Mg(2+); Xref=ChEBI:CHEBI:18420; Evidence={ECO:0000256|HAMAP-
CC         Rule:MF_01283};
CC       Name=Mn(2+); Xref=ChEBI:CHEBI:29035; Evidence={ECO:0000256|HAMAP-
CC         Rule:MF_01283};
CC       Note=Binds 2 divalent metal cations per subunit. Magnesium or
CC       manganese. {ECO:0000256|HAMAP-Rule:MF_01283};
CC   -!- COFACTOR:
CC       Name=Mn(2+); Xref=ChEBI:CHEBI:29035;
CC         Evidence={ECO:0000256|ARBA:ARBA00001936};
CC   -!- COFACTOR:
CC       Name=Zn(2+); Xref=ChEBI:CHEBI:29105; Evidence={ECO:0000256|HAMAP-
CC         Rule:MF_01283};
CC       Note=Binds 1 zinc ion per subunit. {ECO:0000256|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:0000256|ARBA:ARBA00004904, ECO:0000256|HAMAP-Rule:MF_01283}.
CC   -!- PATHWAY: Cofactor biosynthesis; riboflavin biosynthesis; 5-amino-6-(D-
CC       ribitylamino)uracil from GTP: step 1/4. {ECO:0000256|ARBA:ARBA00004853,
CC       ECO:0000256|HAMAP-Rule:MF_01283}.
CC   -!- SIMILARITY: In the C-terminal section; belongs to the GTP
CC       cyclohydrolase II family. {ECO:0000256|HAMAP-Rule:MF_01283}.
CC   -!- SIMILARITY: In the N-terminal section; belongs to the DHBP synthase
CC       family. {ECO:0000256|ARBA:ARBA00005520, ECO:0000256|HAMAP-
CC       Rule:MF_01283}.
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DR   EMBL; CP001859; ADB46761.1; -; Genomic_DNA.
DR   RefSeq; WP_012937751.1; NZ_CP085936.1.
DR   AlphaFoldDB; D2RNY5; -.
DR   STRING; 591001.Acfer_0355; -.
DR   GeneID; 78334109; -.
DR   KEGG; afn:Acfer_0355; -.
DR   eggNOG; COG0108; Bacteria.
DR   eggNOG; COG0807; Bacteria.
DR   HOGENOM; CLU_020273_1_2_9; -.
DR   OrthoDB; 9793111at2; -.
DR   UniPathway; UPA00275; UER00399.
DR   Proteomes; UP000001902; 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; 3.90.870.10; DHBP synthase; 1.
DR   Gene3D; 3.40.50.10990; GTP cyclohydrolase II; 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   NCBIfam; TIGR00505; ribA; 1.
DR   NCBIfam; TIGR00506; ribB; 1.
DR   PANTHER; PTHR21327; GTP CYCLOHYDROLASE II-RELATED; 1.
DR   PANTHER; PTHR21327:SF48; RIBOFLAVIN BIOSYNTHESIS PROTEIN RIBBA; 1.
DR   Pfam; PF00926; DHBP_synthase; 1.
DR   Pfam; PF00925; GTP_cyclohydro2; 1.
DR   PIRSF; PIRSF001259; RibA; 1.
DR   SUPFAM; SSF142695; RibA-like; 1.
DR   SUPFAM; SSF55821; YrdC/RibB; 1.
PE   3: Inferred from homology;
KW   GTP-binding {ECO:0000256|ARBA:ARBA00023134, ECO:0000256|HAMAP-
KW   Rule:MF_01283};
KW   Hydrolase {ECO:0000256|ARBA:ARBA00022801, ECO:0000256|HAMAP-Rule:MF_01283};
KW   Lyase {ECO:0000256|ARBA:ARBA00023239, ECO:0000256|HAMAP-Rule:MF_01283};
KW   Magnesium {ECO:0000256|ARBA:ARBA00022842, ECO:0000256|HAMAP-Rule:MF_01283};
KW   Manganese {ECO:0000256|ARBA:ARBA00023211, ECO:0000256|HAMAP-Rule:MF_01283};
KW   Metal-binding {ECO:0000256|ARBA:ARBA00022723, ECO:0000256|HAMAP-
KW   Rule:MF_01283};
KW   Multifunctional enzyme {ECO:0000256|ARBA:ARBA00023268, ECO:0000256|HAMAP-
KW   Rule:MF_01283};
KW   Nucleotide-binding {ECO:0000256|ARBA:ARBA00022741, ECO:0000256|HAMAP-
KW   Rule:MF_01283}; Reference proteome {ECO:0000313|Proteomes:UP000001902};
KW   Riboflavin biosynthesis {ECO:0000256|ARBA:ARBA00022619, ECO:0000256|HAMAP-
KW   Rule:MF_01283}; Zinc {ECO:0000256|HAMAP-Rule:MF_01283}.
FT   DOMAIN          211..376
FT                   /note="GTP cyclohydrolase II"
FT                   /evidence="ECO:0000259|Pfam:PF00925"
FT   REGION          1..204
FT                   /note="DHBP synthase"
FT                   /evidence="ECO:0000256|HAMAP-Rule:MF_01283"
FT   REGION          205..408
FT                   /note="GTP cyclohydrolase II"
FT                   /evidence="ECO:0000256|HAMAP-Rule:MF_01283"
FT   ACT_SITE        332
FT                   /note="Proton acceptor; for GTP cyclohydrolase activity"
FT                   /evidence="ECO:0000256|HAMAP-Rule:MF_01283"
FT   ACT_SITE        334
FT                   /note="Nucleophile; for GTP cyclohydrolase activity"
FT                   /evidence="ECO:0000256|HAMAP-Rule:MF_01283"
FT   BINDING         31..32
FT                   /ligand="D-ribulose 5-phosphate"
FT                   /ligand_id="ChEBI:CHEBI:58121"
FT                   /evidence="ECO:0000256|HAMAP-Rule:MF_01283"
FT   BINDING         32
FT                   /ligand="Mg(2+)"
FT                   /ligand_id="ChEBI:CHEBI:18420"
FT                   /ligand_label="1"
FT                   /evidence="ECO:0000256|HAMAP-Rule:MF_01283"
FT   BINDING         32
FT                   /ligand="Mg(2+)"
FT                   /ligand_id="ChEBI:CHEBI:18420"
FT                   /ligand_label="2"
FT                   /evidence="ECO:0000256|HAMAP-Rule:MF_01283"
FT   BINDING         36
FT                   /ligand="D-ribulose 5-phosphate"
FT                   /ligand_id="ChEBI:CHEBI:58121"
FT                   /evidence="ECO:0000256|HAMAP-Rule:MF_01283"
FT   BINDING         143..147
FT                   /ligand="D-ribulose 5-phosphate"
FT                   /ligand_id="ChEBI:CHEBI:58121"
FT                   /evidence="ECO:0000256|HAMAP-Rule:MF_01283"
FT   BINDING         146
FT                   /ligand="Mg(2+)"
FT                   /ligand_id="ChEBI:CHEBI:18420"
FT                   /ligand_label="2"
FT                   /evidence="ECO:0000256|HAMAP-Rule:MF_01283"
FT   BINDING         167
FT                   /ligand="D-ribulose 5-phosphate"
FT                   /ligand_id="ChEBI:CHEBI:58121"
FT                   /evidence="ECO:0000256|HAMAP-Rule:MF_01283"
FT   BINDING         255..259
FT                   /ligand="GTP"
FT                   /ligand_id="ChEBI:CHEBI:37565"
FT                   /evidence="ECO:0000256|HAMAP-Rule:MF_01283"
FT   BINDING         260
FT                   /ligand="Zn(2+)"
FT                   /ligand_id="ChEBI:CHEBI:29105"
FT                   /ligand_note="catalytic"
FT                   /evidence="ECO:0000256|HAMAP-Rule:MF_01283"
FT   BINDING         271
FT                   /ligand="Zn(2+)"
FT                   /ligand_id="ChEBI:CHEBI:29105"
FT                   /ligand_note="catalytic"
FT                   /evidence="ECO:0000256|HAMAP-Rule:MF_01283"
FT   BINDING         273
FT                   /ligand="Zn(2+)"
FT                   /ligand_id="ChEBI:CHEBI:29105"
FT                   /ligand_note="catalytic"
FT                   /evidence="ECO:0000256|HAMAP-Rule:MF_01283"
FT   BINDING         276
FT                   /ligand="GTP"
FT                   /ligand_id="ChEBI:CHEBI:37565"
FT                   /evidence="ECO:0000256|HAMAP-Rule:MF_01283"
FT   BINDING         298..300
FT                   /ligand="GTP"
FT                   /ligand_id="ChEBI:CHEBI:37565"
FT                   /evidence="ECO:0000256|HAMAP-Rule:MF_01283"
FT   BINDING         320
FT                   /ligand="GTP"
FT                   /ligand_id="ChEBI:CHEBI:37565"
FT                   /evidence="ECO:0000256|HAMAP-Rule:MF_01283"
FT   BINDING         355
FT                   /ligand="GTP"
FT                   /ligand_id="ChEBI:CHEBI:37565"
FT                   /evidence="ECO:0000256|HAMAP-Rule:MF_01283"
FT   BINDING         360
FT                   /ligand="GTP"
FT                   /ligand_id="ChEBI:CHEBI:37565"
FT                   /evidence="ECO:0000256|HAMAP-Rule:MF_01283"
FT   SITE            129
FT                   /note="Essential for DHBP synthase activity"
FT                   /evidence="ECO:0000256|HAMAP-Rule:MF_01283"
FT   SITE            167
FT                   /note="Essential for DHBP synthase activity"
FT                   /evidence="ECO:0000256|HAMAP-Rule:MF_01283"
SQ   SEQUENCE   408 AA;  45199 MW;  E9C03148F8FE9109 CRC64;
     MDKKFQFAPI EQAIEDIRAG KMVLVTDDPD RENEGDLIMS AEYVTPDDIN FMATHAKGLI
     CMPCDGAILD RLQMEPMVAN NTDNHETAFT VSIDHKDTTT GISAVERAYT IKKCTDESAK
     PEDFRRPGHV FPLRSREGGV LRRTGHTETT TDLCRLAGLK PVGICCEIMS ADGTMARTPE
     LIEFARKFNL TFITVADLIA YRKKNEKMVH RIANVALPSK YGTFRAIGYE NDLDDKCHVA
     IIKGDVAGKK DVLVRVHSEC LTGDALGSLR CDCGDQLATS LKMIEKEGCG VVLYMQQEGR
     GIGLANKLRA YELQDQGLDT VDANVKLGFK PDMRDYGIGA QILADLGLTS IRLMTNNPAK
     RAGLSGYGIT ITETVPIIMK DNCYNHRYMV TKQVRMGHEL HEDVEDAK
//