ID A0A180EQR4_9BACT Unreviewed; 391 AA.
AC A0A180EQR4;
DT 02-NOV-2016, integrated into UniProtKB/TrEMBL.
DT 02-NOV-2016, sequence version 1.
DT 27-MAR-2024, entry version 30.
DE RecName: Full=3,4-dihydroxy-2-butanone 4-phosphate synthase {ECO:0000256|HAMAP-Rule:MF_00180};
DE Short=DHBP synthase {ECO:0000256|HAMAP-Rule:MF_00180};
DE EC=4.1.99.12 {ECO:0000256|HAMAP-Rule:MF_00180};
GN Name=ribB {ECO:0000256|HAMAP-Rule:MF_00180};
GN ORFNames=A3850_014395 {ECO:0000313|EMBL:OAV45608.1};
OS Lewinella sp. 4G2.
OC Bacteria; Bacteroidota; Saprospiria; Saprospirales; Lewinellaceae;
OC Lewinella.
OX NCBI_TaxID=1803372 {ECO:0000313|EMBL:OAV45608.1, ECO:0000313|Proteomes:UP000076582};
RN [1] {ECO:0000313|EMBL:OAV45608.1, ECO:0000313|Proteomes:UP000076582}
RP NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC STRAIN=4G2 {ECO:0000313|EMBL:OAV45608.1,
RC ECO:0000313|Proteomes:UP000076582};
RA Wong S.-K., Yoshizawa S., Ogura Y., Tetsuya H., Nakajima Y., Hamasaki K.;
RT "Lewinella sp. 4G2 Genome sequencing.";
RL Submitted (MAY-2016) 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 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:OAV45608.1}.
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DR EMBL; LVWJ02000014; OAV45608.1; -; Genomic_DNA.
DR RefSeq; WP_068218946.1; NZ_LVWJ02000014.1.
DR AlphaFoldDB; A0A180EQR4; -.
DR STRING; 1803372.A3850_014395; -.
DR OrthoDB; 9793111at2; -.
DR UniPathway; UPA00275; UER00399.
DR Proteomes; UP000076582; 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:UP000076582};
KW Riboflavin biosynthesis {ECO:0000256|ARBA:ARBA00022619, ECO:0000256|HAMAP-
KW Rule:MF_00180}.
FT DOMAIN 230..389
FT /note="GTP cyclohydrolase II"
FT /evidence="ECO:0000259|Pfam:PF00925"
FT BINDING 45..46
FT /ligand="D-ribulose 5-phosphate"
FT /ligand_id="ChEBI:CHEBI:58121"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_00180"
FT BINDING 46
FT /ligand="Mg(2+)"
FT /ligand_id="ChEBI:CHEBI:18420"
FT /ligand_label="1"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_00180"
FT BINDING 46
FT /ligand="Mg(2+)"
FT /ligand_id="ChEBI:CHEBI:18420"
FT /ligand_label="2"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_00180"
FT BINDING 50
FT /ligand="D-ribulose 5-phosphate"
FT /ligand_id="ChEBI:CHEBI:58121"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_00180"
FT BINDING 159..163
FT /ligand="D-ribulose 5-phosphate"
FT /ligand_id="ChEBI:CHEBI:58121"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_00180"
FT BINDING 162
FT /ligand="Mg(2+)"
FT /ligand_id="ChEBI:CHEBI:18420"
FT /ligand_label="2"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_00180"
FT SITE 145
FT /note="Essential for catalytic activity"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_00180"
FT SITE 183
FT /note="Essential for catalytic activity"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_00180"
SQ SEQUENCE 391 AA; 43168 MW; C1A31BC459CDDB94 CRC64;
MSGNQATVTS QAEAGRATYQ LNTIEEAVAD IRAGKVVIVV DDEDRENEGD FVCAAERVTP
EIINFMATYG RGLICTPIAE ERADRLGLTK MVETNTDVHE TAFSVTIDLI GHGCTTGISA
YDRATCIRRM TEHSAKPSDF TRPGHVFPLR AVKGGVLRRT GHTEAAVDLA TMANLYPAGV
IVEILKPDGE MARMPYLMDL AKEHDLKIVS IEDLVAYRLQ MERLVECEFS MDLDTRYGPF
KLYAYRQTTN NDVHLALTHG EWAVDEPVLT RVHSSTSSRD LLHSLLSGYS TGLHGPLEKI
SEAGKGILLF MRPHQDGSEV IAGLRLLKSR MQDGRKASIS QPASMDQRDF GIGAQMLRDL
KVSKLRILSN NPKNRIGLEG YGLEVVEFVS M
//
