ID   GCH3_PYRAR              Reviewed;         221 AA.
AC   A4WKJ7;
DT   28-JUL-2009, integrated into UniProtKB/Swiss-Prot.
DT   29-MAY-2007, sequence version 1.
DT   25-MAY-2022, entry version 68.
DE   RecName: Full=GTP cyclohydrolase III {ECO:0000255|HAMAP-Rule:MF_00608};
DE            EC=3.5.4.29 {ECO:0000255|HAMAP-Rule:MF_00608};
GN   Name=gch3 {ECO:0000255|HAMAP-Rule:MF_00608}; OrderedLocusNames=Pars_1351;
OS   Pyrobaculum arsenaticum (strain DSM 13514 / JCM 11321 / PZ6).
OC   Archaea; Crenarchaeota; Thermoprotei; Thermoproteales; Thermoproteaceae;
OC   Pyrobaculum.
OX   NCBI_TaxID=340102;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=ATCC 700994 / DSM 13514 / JCM 11321 / PZ6;
RG   US DOE Joint Genome Institute;
RA   Copeland A., Lucas S., Lapidus A., Barry K., Glavina del Rio T., Dalin E.,
RA   Tice H., Pitluck S., Chain P., Malfatti S., Shin M., Vergez L., Schmutz J.,
RA   Larimer F., Land M., Hauser L., Kyrpides N., Mikhailova N., Cozen A.E.,
RA   Fitz-Gibbon S.T., House C.H., Saltikov C., Lowe T.M., Richardson P.;
RT   "Complete sequence of Pyrobaculum arsenaticum DSM 13514.";
RL   Submitted (APR-2007) to the EMBL/GenBank/DDBJ databases.
CC   -!- FUNCTION: Catalyzes the formation of 2-amino-5-formylamino-6-
CC       ribofuranosylamino-4(3H)-pyrimidinone ribonucleotide monophosphate and
CC       inorganic phosphate from GTP. Also has an independent pyrophosphate
CC       phosphohydrolase activity. {ECO:0000255|HAMAP-Rule:MF_00608}.
CC   -!- CATALYTIC ACTIVITY:
CC       Reaction=GTP + 3 H2O = 2-amino-5-formylamino-6-(5-phospho-D-
CC         ribosylamino)pyrimidin-4(3H)-one + 2 H(+) + 2 phosphate;
CC         Xref=Rhea:RHEA:22468, ChEBI:CHEBI:15377, ChEBI:CHEBI:15378,
CC         ChEBI:CHEBI:37565, ChEBI:CHEBI:43474, ChEBI:CHEBI:57258; EC=3.5.4.29;
CC         Evidence={ECO:0000255|HAMAP-Rule:MF_00608};
CC   -!- SIMILARITY: Belongs to the archaeal-type GTP cyclohydrolase family.
CC       {ECO:0000255|HAMAP-Rule:MF_00608}.
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DR   EMBL; CP000660; ABP50914.1; -; Genomic_DNA.
DR   AlphaFoldDB; A4WKJ7; -.
DR   SMR; A4WKJ7; -.
DR   STRING; 340102.Pars_1351; -.
DR   EnsemblBacteria; ABP50914; ABP50914; Pars_1351.
DR   KEGG; pas:Pars_1351; -.
DR   HOGENOM; CLU_080076_0_0_2; -.
DR   OMA; VQIAHID; -.
DR   PhylomeDB; A4WKJ7; -.
DR   Proteomes; UP000001567; Chromosome.
DR   GO; GO:0005525; F:GTP binding; IEA:UniProtKB-KW.
DR   GO; GO:0043740; F:GTP cyclohydrolase IIa activity; IEA:UniProtKB-EC.
DR   GO; GO:0009058; P:biosynthetic process; IEA:InterPro.
DR   Gene3D; 3.30.70.1230; -; 2.
DR   HAMAP; MF_00608; GTP_cyclohydro_3; 1.
DR   InterPro; IPR007839; GTP_CycHdrlase_3.
DR   InterPro; IPR029787; Nucleotide_cyclase.
DR   PANTHER; PTHR42202; PTHR42202; 1.
DR   Pfam; PF05165; GCH_III; 2.
DR   PIRSF; PIRSF009265; GTP_cyclohydro_3; 1.
PE   3: Inferred from homology;
KW   GTP-binding; Hydrolase; Nucleotide-binding.
FT   CHAIN           1..221
FT                   /note="GTP cyclohydrolase III"
FT                   /id="PRO_1000147162"
SQ   SEQUENCE   221 AA;  24405 MW;  C80C45DF9A4D7779 CRC64;
     MHKVVLISLR GYREWTESLG PRREHIIQKV QARIHGALWS SFTAVGALPH HFRYDYLIAL
     ANNVPRHWID TAVAKIRRSS PVEVDYCIGM GETPLDAYRS CGEHKEGKES NAVVAHVDIV
     NSTDATRING PIHTYLRALD MLRTAAGACE DVGCIAFYLG GDNMVVYLPE PKAIYALLDR
     VEAPVRAGVG VSPRPYTAFV KATKGLDALR AENKTGVKVV R