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Database: UniProt
Entry: A0A2A5CG33_9GAMM
LinkDB: A0A2A5CG33_9GAMM
Original site: A0A2A5CG33_9GAMM 
ID   A0A2A5CG33_9GAMM        Unreviewed;       376 AA.
AC   A0A2A5CG33;
DT   20-DEC-2017, integrated into UniProtKB/TrEMBL.
DT   20-DEC-2017, sequence version 1.
DT   27-MAR-2024, entry version 24.
DE   RecName: Full=3,4-dihydroxy-2-butanone 4-phosphate synthase {ECO:0000256|ARBA:ARBA00018836, ECO:0000256|HAMAP-Rule:MF_00180};
DE            Short=DHBP synthase {ECO:0000256|HAMAP-Rule:MF_00180};
DE            EC=4.1.99.12 {ECO:0000256|ARBA:ARBA00012153, ECO:0000256|HAMAP-Rule:MF_00180};
GN   Name=ribB {ECO:0000256|HAMAP-Rule:MF_00180,
GN   ECO:0000313|EMBL:PCJ42465.1};
GN   ORFNames=COA99_08070 {ECO:0000313|EMBL:PCJ42465.1};
OS   Moraxellaceae bacterium.
OC   Bacteria; Pseudomonadota; Gammaproteobacteria; Moraxellales; Moraxellaceae.
OX   NCBI_TaxID=1889775 {ECO:0000313|EMBL:PCJ42465.1, ECO:0000313|Proteomes:UP000218379};
RN   [1] {ECO:0000313|Proteomes:UP000218379}
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RA   Tully B.J., Wheat C.G., Glazer B.T., Huber J.A.;
RT   "A dynamic microbial community with high functional redundancy inhabits the
RT   cold, oxic subseafloor aquifer.";
RL   Submitted (AUG-2017) to the EMBL/GenBank/DDBJ databases.
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_00180}.
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_00180};
CC   -!- COFACTOR:
CC       Name=Mg(2+); Xref=ChEBI:CHEBI:18420;
CC         Evidence={ECO:0000256|HAMAP-Rule:MF_00180};
CC       Name=Mn(2+); Xref=ChEBI:CHEBI:29035;
CC         Evidence={ECO:0000256|HAMAP-Rule:MF_00180};
CC       Note=Binds 2 divalent metal cations per subunit. Magnesium or
CC       manganese. {ECO:0000256|HAMAP-Rule:MF_00180};
CC   -!- COFACTOR:
CC       Name=Mn(2+); Xref=ChEBI:CHEBI:29035;
CC         Evidence={ECO:0000256|ARBA:ARBA00001936};
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_00180}.
CC   -!- SUBUNIT: Homodimer. {ECO:0000256|HAMAP-Rule:MF_00180}.
CC   -!- SIMILARITY: Belongs to the DHBP synthase family. {ECO:0000256|HAMAP-
CC       Rule:MF_00180}.
CC   -!- SIMILARITY: In the C-terminal section; belongs to the GTP
CC       cyclohydrolase II family. {ECO:0000256|ARBA:ARBA00008976}.
CC   -!- SIMILARITY: In the N-terminal section; belongs to the DHBP synthase
CC       family. {ECO:0000256|ARBA:ARBA00005520}.
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:PCJ42465.1}.
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DR   EMBL; NVVG01000062; PCJ42465.1; -; Genomic_DNA.
DR   AlphaFoldDB; A0A2A5CG33; -.
DR   UniPathway; UPA00275; UER00399.
DR   Proteomes; UP000218379; Unassembled WGS sequence.
DR   GO; GO:0008686; F:3,4-dihydroxy-2-butanone-4-phosphate synthase 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:0009231; P:riboflavin biosynthetic process; IEA:UniProtKB-UniRule.
DR   Gene3D; 3.90.870.10; DHBP synthase; 1.
DR   Gene3D; 3.40.50.10990; GTP cyclohydrolase II; 1.
DR   HAMAP; MF_00180; RibB; 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; IPR036144; RibA-like_sf.
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   Lyase {ECO:0000256|HAMAP-Rule:MF_00180};
KW   Magnesium {ECO:0000256|HAMAP-Rule:MF_00180};
KW   Manganese {ECO:0000256|HAMAP-Rule:MF_00180};
KW   Metal-binding {ECO:0000256|ARBA:ARBA00022723, ECO:0000256|HAMAP-
KW   Rule:MF_00180};
KW   Riboflavin biosynthesis {ECO:0000256|ARBA:ARBA00022619, ECO:0000256|HAMAP-
KW   Rule:MF_00180}.
FT   DOMAIN          210..369
FT                   /note="GTP cyclohydrolase II"
FT                   /evidence="ECO:0000259|Pfam:PF00925"
FT   BINDING         27..28
FT                   /ligand="D-ribulose 5-phosphate"
FT                   /ligand_id="ChEBI:CHEBI:58121"
FT                   /evidence="ECO:0000256|HAMAP-Rule:MF_00180"
FT   BINDING         28
FT                   /ligand="Mg(2+)"
FT                   /ligand_id="ChEBI:CHEBI:18420"
FT                   /ligand_label="1"
FT                   /evidence="ECO:0000256|HAMAP-Rule:MF_00180"
FT   BINDING         28
FT                   /ligand="Mg(2+)"
FT                   /ligand_id="ChEBI:CHEBI:18420"
FT                   /ligand_label="2"
FT                   /evidence="ECO:0000256|HAMAP-Rule:MF_00180"
FT   BINDING         32
FT                   /ligand="D-ribulose 5-phosphate"
FT                   /ligand_id="ChEBI:CHEBI:58121"
FT                   /evidence="ECO:0000256|HAMAP-Rule:MF_00180"
FT   BINDING         140..144
FT                   /ligand="D-ribulose 5-phosphate"
FT                   /ligand_id="ChEBI:CHEBI:58121"
FT                   /evidence="ECO:0000256|HAMAP-Rule:MF_00180"
FT   BINDING         143
FT                   /ligand="Mg(2+)"
FT                   /ligand_id="ChEBI:CHEBI:18420"
FT                   /ligand_label="2"
FT                   /evidence="ECO:0000256|HAMAP-Rule:MF_00180"
FT   SITE            126
FT                   /note="Essential for catalytic activity"
FT                   /evidence="ECO:0000256|HAMAP-Rule:MF_00180"
FT   SITE            164
FT                   /note="Essential for catalytic activity"
FT                   /evidence="ECO:0000256|HAMAP-Rule:MF_00180"
SQ   SEQUENCE   376 AA;  41394 MW;  4678F36CE19F612B CRC64;
     MKLNTIEELI NDIRLGKMVV LMDDEDRENE GDLIIAASMV RPADINFMAT HARGLICLTL
     TQARCEQLQL PLMVDSNQCQ HGTNFTMSIE AAEGVTTGIS AADRATTILA AVARDAKVDD
     IVQPGHIFPL KAQEGGVLRR AGHTEAGCDL ARLAGYEPAA AIVEIMNEDG TMARRPDLEV
     FAETHGLKIG TIADLIHYRT FNEKTIEKIR EDTLPTEYGD FQLFVFQDLI DNQTHLALVK
     GDLSAVAEPH VRVHIADPLR DLIGAIKHEG SGWSLPRVMR FVAEKSDAGV ILLLGDSFQE
     QGVSEIVDSF YNGRRPNRIQ TIDGKSEYRN IGTGAQILRQ LGVSKMRLLS APMHFNALSG
     FDLEVTEYIS SNDIND
//
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