ID I9C8C8_9SPHN Unreviewed; 436 AA.
AC I9C8C8;
DT 03-OCT-2012, integrated into UniProtKB/TrEMBL.
DT 03-OCT-2012, sequence version 1.
DT 27-MAR-2024, entry version 55.
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 ORFNames=WSK_1180 {ECO:0000313|EMBL:EIZ80147.1};
OS Novosphingobium sp. Rr 2-17.
OC Bacteria; Pseudomonadota; Alphaproteobacteria; Sphingomonadales;
OC Sphingomonadaceae; Novosphingobium.
OX NCBI_TaxID=555793 {ECO:0000313|EMBL:EIZ80147.1, ECO:0000313|Proteomes:UP000004732};
RN [1] {ECO:0000313|EMBL:EIZ80147.1, ECO:0000313|Proteomes:UP000004732}
RP NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC STRAIN=RR2-17 {ECO:0000313|Proteomes:UP000004732};
RX PubMed=22933764; DOI=10.1128/JB.01159-12;
RA Gan H.M., Chew T.H., Hudson A.O., Savka M.A.;
RT "Genome Sequence of Novosphingobium sp. Strain Rr 2-17, a Nopaline Crown
RT Gall-Associated Bacterium Isolated from Vitis vinifera L. Grapevine.";
RL J. Bacteriol. 194:5137-5138(2012).
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:EIZ80147.1}.
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DR EMBL; AKFJ01000015; EIZ80147.1; -; Genomic_DNA.
DR RefSeq; WP_008994132.1; NZ_AKFJ01000015.1.
DR AlphaFoldDB; I9C8C8; -.
DR PATRIC; fig|555793.3.peg.1183; -.
DR eggNOG; COG0108; Bacteria.
DR eggNOG; COG0807; Bacteria.
DR OrthoDB; 9793111at2; -.
DR UniPathway; UPA00275; UER00399.
DR Proteomes; UP000004732; 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}; Reference proteome {ECO:0000313|Proteomes:UP000004732};
KW Riboflavin biosynthesis {ECO:0000256|ARBA:ARBA00022619, ECO:0000256|HAMAP-
KW Rule:MF_00180}.
FT DOMAIN 272..426
FT /note="GTP cyclohydrolase II"
FT /evidence="ECO:0000259|Pfam:PF00925"
FT BINDING 89..90
FT /ligand="D-ribulose 5-phosphate"
FT /ligand_id="ChEBI:CHEBI:58121"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_00180"
FT BINDING 90
FT /ligand="Mg(2+)"
FT /ligand_id="ChEBI:CHEBI:18420"
FT /ligand_label="2"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_00180"
FT BINDING 90
FT /ligand="Mg(2+)"
FT /ligand_id="ChEBI:CHEBI:18420"
FT /ligand_label="1"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_00180"
FT BINDING 94
FT /ligand="D-ribulose 5-phosphate"
FT /ligand_id="ChEBI:CHEBI:58121"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_00180"
FT BINDING 202..206
FT /ligand="D-ribulose 5-phosphate"
FT /ligand_id="ChEBI:CHEBI:58121"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_00180"
FT BINDING 205
FT /ligand="Mg(2+)"
FT /ligand_id="ChEBI:CHEBI:18420"
FT /ligand_label="2"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_00180"
FT SITE 188
FT /note="Essential for catalytic activity"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_00180"
FT SITE 226
FT /note="Essential for catalytic activity"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_00180"
SQ SEQUENCE 436 AA; 47864 MW; 80DD0D78BB598EDE CRC64;
MADTMIDRVR RLIVDGGMSK AGLARAAGLH ANTLRDCTEP DWNPTAHTLS KLERVLFAND
DREVLAPIEE IIDEARNGRM FILVDDEDRE NEGDLIIPAQ MATPSAINFM ATHGRGLICL
ALTSQRIDEL GLDLMSRNNG TRHETAFTVS IEARDGVTTG ISAADRARTV SVAIDGTKSR
DDIVTPGHVF PLRARTGGVL VRTGHTEAAV DISRLAGLNP SGVICEIMKD DGTMARMDDL
VSFARLHDIK IGTIRDLIAY RRKHDRMVEL RAELSFESRH GGQWTARTYF NRATGDETMT
LVKGRIDPAT PTLVRMHTLS IFSDILGEQN SDRGDLLHRS MQIIGEEGSG VIVLINRPMG
MLMSRTIDIK QRVRAGETPD LEELRDYGVG AQILAELGIH DMVLLTNTQH SLVALEGYGL
NIVGERPIGC KSQGAQ
//
