ID A0A126RSQ7_9SPHN Unreviewed; 352 AA.
AC A0A126RSQ7;
DT 11-MAY-2016, integrated into UniProtKB/TrEMBL.
DT 11-MAY-2016, sequence version 1.
DT 27-MAR-2024, entry version 38.
DE RecName: Full=GTP cyclohydrolase-2 {ECO:0000256|HAMAP-Rule:MF_00179};
DE EC=3.5.4.25 {ECO:0000256|HAMAP-Rule:MF_00179};
DE AltName: Full=GTP cyclohydrolase II {ECO:0000256|HAMAP-Rule:MF_00179};
GN Name=ribA {ECO:0000256|HAMAP-Rule:MF_00179};
GN ORFNames=K426_20965 {ECO:0000313|EMBL:AMK25122.1};
OS Sphingobium sp. TKS.
OC Bacteria; Pseudomonadota; Alphaproteobacteria; Sphingomonadales;
OC Sphingomonadaceae; Sphingobium.
OX NCBI_TaxID=1315974 {ECO:0000313|EMBL:AMK25122.1, ECO:0000313|Proteomes:UP000060779};
RN [1] {ECO:0000313|Proteomes:UP000060779}
RP NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC STRAIN=TKS {ECO:0000313|Proteomes:UP000060779};
RA Tabata M.;
RT "Whole genome sequence of gamma-HCH degrading bacterium Sphingobium sp.
RT TKS.";
RL Submitted (APR-2013) to the EMBL/GenBank/DDBJ databases.
RN [2] {ECO:0000313|EMBL:AMK25122.1, ECO:0000313|Proteomes:UP000060779}
RP NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC STRAIN=TKS {ECO:0000313|EMBL:AMK25122.1,
RC ECO:0000313|Proteomes:UP000060779};
RX PubMed=27056231;
RA Tabata M., Ohhata S., Kawasumi T., Nikawadori Y., Kishida K., Sato T.,
RA Ohtsubo Y., Tsuda M., Nagata Y.;
RT "Complete Genome Sequence of a gamma-Hexachlorocyclohexane Degrader,
RT Sphingobium sp. Strain TKS, Isolated from a gamma-Hexachlorocyclohexane-
RT Degrading Microbial Community.";
RL Genome Announc. 4:0-0(2016).
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|ARBA:ARBA00043932, ECO:0000256|HAMAP-
CC Rule:MF_00179}.
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_00179};
CC -!- COFACTOR:
CC Name=Zn(2+); Xref=ChEBI:CHEBI:29105;
CC Evidence={ECO:0000256|HAMAP-Rule:MF_00179};
CC Note=Binds 1 zinc ion per subunit. {ECO:0000256|HAMAP-Rule:MF_00179};
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_00179}.
CC -!- SIMILARITY: Belongs to the GTP cyclohydrolase II family.
CC {ECO:0000256|HAMAP-Rule:MF_00179}.
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DR EMBL; CP005083; AMK25122.1; -; Genomic_DNA.
DR RefSeq; WP_066561151.1; NZ_CP005083.1.
DR AlphaFoldDB; A0A126RSQ7; -.
DR STRING; 1315974.K426_20965; -.
DR KEGG; spht:K426_20965; -.
DR PATRIC; fig|1315974.3.peg.4404; -.
DR OrthoDB; 9793111at2; -.
DR UniPathway; UPA00275; UER00400.
DR Proteomes; UP000060779; Chromosome 1.
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: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; GTP cyclohydrolase II; 1.
DR HAMAP; MF_00179; RibA; 1.
DR InterPro; IPR032677; GTP_cyclohydro_II.
DR InterPro; IPR000926; RibA.
DR InterPro; IPR036144; RibA-like_sf.
DR NCBIfam; TIGR00505; ribA; 1.
DR PANTHER; PTHR21327:SF18; 3,4-DIHYDROXY-2-BUTANONE 4-PHOSPHATE SYNTHASE; 1.
DR PANTHER; PTHR21327; GTP CYCLOHYDROLASE II-RELATED; 1.
DR Pfam; PF00925; GTP_cyclohydro2; 1.
DR SUPFAM; SSF142695; RibA-like; 1.
PE 3: Inferred from homology;
KW GTP-binding {ECO:0000256|ARBA:ARBA00023134, ECO:0000256|HAMAP-
KW Rule:MF_00179};
KW Hydrolase {ECO:0000256|ARBA:ARBA00022801, ECO:0000256|HAMAP-Rule:MF_00179};
KW Metal-binding {ECO:0000256|HAMAP-Rule:MF_00179};
KW Nucleotide-binding {ECO:0000256|ARBA:ARBA00022741, ECO:0000256|HAMAP-
KW Rule:MF_00179}; Reference proteome {ECO:0000313|Proteomes:UP000060779};
KW Riboflavin biosynthesis {ECO:0000256|ARBA:ARBA00022619, ECO:0000256|HAMAP-
KW Rule:MF_00179}; Zinc {ECO:0000256|HAMAP-Rule:MF_00179}.
FT DOMAIN 166..328
FT /note="GTP cyclohydrolase II"
FT /evidence="ECO:0000259|Pfam:PF00925"
FT ACT_SITE 284
FT /note="Proton acceptor"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_00179"
FT ACT_SITE 286
FT /note="Nucleophile"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_00179"
FT BINDING 207..211
FT /ligand="GTP"
FT /ligand_id="ChEBI:CHEBI:37565"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_00179"
FT BINDING 212
FT /ligand="Zn(2+)"
FT /ligand_id="ChEBI:CHEBI:29105"
FT /ligand_note="catalytic"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_00179"
FT BINDING 223
FT /ligand="Zn(2+)"
FT /ligand_id="ChEBI:CHEBI:29105"
FT /ligand_note="catalytic"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_00179"
FT BINDING 225
FT /ligand="Zn(2+)"
FT /ligand_id="ChEBI:CHEBI:29105"
FT /ligand_note="catalytic"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_00179"
FT BINDING 228
FT /ligand="GTP"
FT /ligand_id="ChEBI:CHEBI:37565"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_00179"
FT BINDING 250..252
FT /ligand="GTP"
FT /ligand_id="ChEBI:CHEBI:37565"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_00179"
FT BINDING 272
FT /ligand="GTP"
FT /ligand_id="ChEBI:CHEBI:37565"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_00179"
FT BINDING 307
FT /ligand="GTP"
FT /ligand_id="ChEBI:CHEBI:37565"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_00179"
FT BINDING 312
FT /ligand="GTP"
FT /ligand_id="ChEBI:CHEBI:37565"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_00179"
SQ SEQUENCE 352 AA; 37426 MW; A7C9FCCC545A551F CRC64;
MGARAAARAI DALRRGWPVR VQAADGALRL MAIEGADAVT LAGFDPGAEA DILISAARAQ
TLKLANQLAA ADPDMPVLVA RAPWIDVDVA TAISDPVLDL ASPLKGPFMA KPLAAPVAAK
AALRLARLAG ILPAYFATVE GEAEAEVSAA DVDAYDDAVH LDIATRARLP VSASETAEIV
AFRSPDEPRE HVALIVGQRD ASPPVIRLHS ECLTGDVLGS LKCDCGPQLH EALHRIADSN
WGILLYLRQE GRGIGLVNKL RAYALQDQGF DTVDANVRLG FAIDARDFSV AARMLDLLGV
GEVRLLTNNP NKVTGLEKAG IKVAERLPII LPTNPHNERY LATKRDRTGH QL
//
