ID A0A3D5WAT2_9DELT Unreviewed; 401 AA. AC A0A3D5WAT2; DT 16-JAN-2019, integrated into UniProtKB/TrEMBL. DT 16-JAN-2019, sequence version 1. DT 03-AUG-2022, entry version 12. 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 ORFNames=DHT43_00080 {ECO:0000313|EMBL:HCX88922.1}; OS Deltaproteobacteria bacterium. OC Bacteria; Proteobacteria; Deltaproteobacteria. OX NCBI_TaxID=2026735 {ECO:0000313|EMBL:HCX88922.1, ECO:0000313|Proteomes:UP000262942}; RN [1] {ECO:0000313|EMBL:HCX88922.1, ECO:0000313|Proteomes:UP000262942} RP NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA]. RC STRAIN=UBA8473 {ECO:0000313|EMBL:HCX88922.1}; RX PubMed=30148503; DOI=.1038/nbt.4229; RA Parks D.H., Chuvochina M., Waite D.W., Rinke C., Skarshewski A., RA Chaumeil P.A., Hugenholtz P.; RT "A standardized bacterial taxonomy based on genome phylogeny substantially RT revises the tree of life."; RL Nat. Biotechnol. 36:996-1004(2018). 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; CC Evidence={ECO:0000256|HAMAP-Rule:MF_01283}; CC Name=Mn(2+); Xref=ChEBI:CHEBI:29035; CC Evidence={ECO:0000256|HAMAP-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=Zn(2+); Xref=ChEBI:CHEBI:29105; CC Evidence={ECO:0000256|HAMAP-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|ARBA:ARBA00008976, CC 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}. CC -!- CAUTION: Lacks conserved residue(s) required for the propagation of CC feature annotation. {ECO:0000256|HAMAP-Rule:MF_01283}. CC -!- CAUTION: The sequence shown here is derived from an EMBL/GenBank/DDBJ CC whole genome shotgun (WGS) entry which is preliminary data. CC {ECO:0000313|EMBL:HCX88922.1}. CC --------------------------------------------------------------------------- CC Copyrighted by the UniProt Consortium, see https://www.uniprot.org/terms CC Distributed under the Creative Commons Attribution (CC BY 4.0) License CC --------------------------------------------------------------------------- DR EMBL; DPPR01000003; HCX88922.1; -; Genomic_DNA. DR UniPathway; UPA00275; UER00399. DR Proteomes; UP000262942; Unassembled WGS sequence. 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 {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|HAMAP-Rule:MF_01283}; KW Magnesium {ECO:0000256|HAMAP-Rule:MF_01283}; KW Manganese {ECO:0000256|HAMAP-Rule:MF_01283}; KW Metal-binding {ECO:0000256|ARBA:ARBA00022723, ECO:0000256|HAMAP- KW Rule:MF_01283}; Multifunctional enzyme {ECO:0000256|HAMAP-Rule:MF_01283}; KW Nucleotide-binding {ECO:0000256|ARBA:ARBA00022741, ECO:0000256|HAMAP- KW Rule:MF_01283}; KW Riboflavin biosynthesis {ECO:0000256|ARBA:ARBA00022619, ECO:0000256|HAMAP- KW Rule:MF_01283}; Zinc {ECO:0000256|HAMAP-Rule:MF_01283}. FT DOMAIN 208..374 FT /note="GTP_cyclohydro2" FT /evidence="ECO:0000259|Pfam:PF00925" FT REGION 1..201 FT /note="DHBP synthase" FT /evidence="ECO:0000256|HAMAP-Rule:MF_01283" FT REGION 27..28 FT /note="D-ribulose 5-phosphate binding" FT /evidence="ECO:0000256|HAMAP-Rule:MF_01283" FT REGION 202..401 FT /note="GTP cyclohydrolase II" FT /evidence="ECO:0000256|HAMAP-Rule:MF_01283" FT ACT_SITE 330 FT /note="Proton acceptor; for GTP cyclohydrolase activity" FT /evidence="ECO:0000256|HAMAP-Rule:MF_01283" FT ACT_SITE 332 FT /note="Nucleophile; for GTP cyclohydrolase activity" FT /evidence="ECO:0000256|HAMAP-Rule:MF_01283" FT BINDING 28 FT /ligand="Mg(2+)" FT /ligand_id="ChEBI:CHEBI:18420" FT /ligand_label="1" FT /evidence="ECO:0000256|HAMAP-Rule:MF_01283" FT BINDING 28 FT /ligand="Mg(2+)" FT /ligand_id="ChEBI:CHEBI:18420" FT /ligand_label="2" FT /evidence="ECO:0000256|HAMAP-Rule:MF_01283" FT BINDING 32 FT /ligand="D-ribulose 5-phosphate" FT /ligand_id="ChEBI:CHEBI:58121" FT /evidence="ECO:0000256|HAMAP-Rule:MF_01283" FT BINDING 164 FT /ligand="D-ribulose 5-phosphate" FT /ligand_id="ChEBI:CHEBI:58121" FT /evidence="ECO:0000256|HAMAP-Rule:MF_01283" FT BINDING 253..257 FT /ligand="GTP" FT /ligand_id="ChEBI:CHEBI:37565" FT /evidence="ECO:0000256|HAMAP-Rule:MF_01283" FT BINDING 258 FT /ligand="Zn(2+)" FT /ligand_id="ChEBI:CHEBI:29105" FT /ligand_note="catalytic" FT /evidence="ECO:0000256|HAMAP-Rule:MF_01283" FT BINDING 269 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 274 FT /ligand="GTP" FT /ligand_id="ChEBI:CHEBI:37565" FT /evidence="ECO:0000256|HAMAP-Rule:MF_01283" FT BINDING 296..298 FT /ligand="GTP" FT /ligand_id="ChEBI:CHEBI:37565" FT /evidence="ECO:0000256|HAMAP-Rule:MF_01283" FT BINDING 318 FT /ligand="GTP" FT /ligand_id="ChEBI:CHEBI:37565" FT /evidence="ECO:0000256|HAMAP-Rule:MF_01283" FT BINDING 353 FT /ligand="GTP" FT /ligand_id="ChEBI:CHEBI:37565" FT /evidence="ECO:0000256|HAMAP-Rule:MF_01283" FT BINDING 358 FT /ligand="GTP" FT /ligand_id="ChEBI:CHEBI:37565" FT /evidence="ECO:0000256|HAMAP-Rule:MF_01283" FT SITE 126 FT /note="Essential for DHBP synthase activity" FT /evidence="ECO:0000256|HAMAP-Rule:MF_01283" FT SITE 164 FT /note="Essential for DHBP synthase activity" FT /evidence="ECO:0000256|HAMAP-Rule:MF_01283" SQ SEQUENCE 401 AA; 44579 MW; CC8A0C5D34877DD4 CRC64; MALSTIKEAI EDIKKGKIII LVDDEDRENE GDLMMAAEKI TPDAVNFMAR YGRGLICLTL NEKRAKELHL SPMVTDNTSH FNTAFTVSIE ARCGVTTGIS AADRAMTILT AIDEKTKPQD LARPGHIFPI IARNGGVLVR TGQTEGSVDL ARLSGLIPAG VICEIMKDDG TMARMPDLEI FAEKHGLKIV TIADIIEYRL QNEGLVRRVA ETRIPTLYGG EFKAIAYEND VDSHQHLALV KGDINPEDEI LVRVHSECLT GDVFGSQRCD CGEQLHTAMR MIEEEGKGVI VYMHQEGRGI GLINKLRAYE LQDQGLDTVQ ANERLGFKPD LRDYGVGAQI LRDLGVRKMR QMTNNPKKIK GIEGYGLVVT ERVPIETKPN DNNIKYLETK KKKMGHMLNI K //