ID   GCH3_AERPE              Reviewed;         241 AA.
AC   Q9YC89;
DT   13-DEC-2002, integrated into UniProtKB/Swiss-Prot.
DT   26-JUN-2007, sequence version 2.
DT   25-MAY-2022, entry version 95.
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=APE_1365.1;
OS   Aeropyrum pernix (strain ATCC 700893 / DSM 11879 / JCM 9820 / NBRC 100138 /
OS   K1).
OC   Archaea; Crenarchaeota; Thermoprotei; Desulfurococcales;
OC   Desulfurococcaceae; Aeropyrum.
OX   NCBI_TaxID=272557;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=ATCC 700893 / DSM 11879 / JCM 9820 / NBRC 100138 / K1;
RX   PubMed=10382966; DOI=10.1093/dnares/6.2.83;
RA   Kawarabayasi Y., Hino Y., Horikawa H., Yamazaki S., Haikawa Y., Jin-no K.,
RA   Takahashi M., Sekine M., Baba S., Ankai A., Kosugi H., Hosoyama A.,
RA   Fukui S., Nagai Y., Nishijima K., Nakazawa H., Takamiya M., Masuda S.,
RA   Funahashi T., Tanaka T., Kudoh Y., Yamazaki J., Kushida N., Oguchi A.,
RA   Aoki K., Kubota K., Nakamura Y., Nomura N., Sako Y., Kikuchi H.;
RT   "Complete genome sequence of an aerobic hyper-thermophilic crenarchaeon,
RT   Aeropyrum pernix K1.";
RL   DNA Res. 6:83-101(1999).
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; BA000002; BAA80359.2; -; Genomic_DNA.
DR   PIR; A72613; A72613.
DR   AlphaFoldDB; Q9YC89; -.
DR   SMR; Q9YC89; -.
DR   STRING; 272557.APE_1365.1; -.
DR   EnsemblBacteria; BAA80359; BAA80359; APE_1365.1.
DR   KEGG; ape:APE_1365.1; -.
DR   eggNOG; arCOG04202; Archaea.
DR   Proteomes; UP000002518; 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; -; 1.
DR   Gene3D; 3.30.70.270; -; 1.
DR   HAMAP; MF_00608; GTP_cyclohydro_3; 1.
DR   InterPro; IPR007839; GTP_CycHdrlase_3.
DR   InterPro; IPR029787; Nucleotide_cyclase.
DR   InterPro; IPR043128; Rev_trsase/Diguanyl_cyclase.
DR   PANTHER; PTHR42202; PTHR42202; 1.
DR   Pfam; PF05165; GCH_III; 1.
DR   PIRSF; PIRSF009265; GTP_cyclohydro_3; 1.
PE   3: Inferred from homology;
KW   GTP-binding; Hydrolase; Nucleotide-binding; Reference proteome.
FT   CHAIN           1..241
FT                   /note="GTP cyclohydrolase III"
FT                   /id="PRO_0000145751"
SQ   SEQUENCE   241 AA;  26483 MW;  1199CE6834F76480 CRC64;
     MDAKKAVRVA VVEQVGYREW TEELGSDREW IIQTLQSDIY AAAQKEAAGY GGFVLPIRYD
     IMLLISSNMG VQEHARVLDA IAGLSKVKVR MASYCGVKPL DAVERAWNAL RRREERLIYE
     RCEGEEYTAI AHIDLNNVTA ITRAEGPVRT YYEVMDLMAK ISKVAEKIGA ITQYLGGDNI
     LAVLPLNGSV KETVDMLLVR SDLKAGIGIA PTARASLALA AEALHEIRSK INPGPLVVKA
     Q