ID   GCH1_SYNJA              Reviewed;         229 AA.
AC   Q2JR69;
DT   15-JAN-2008, integrated into UniProtKB/Swiss-Prot.
DT   07-MAR-2006, sequence version 1.
DT   02-SEP-2026, entry version 104.
DE   RecName: Full=GTP cyclohydrolase 1 {ECO:0000255|HAMAP-Rule:MF_00223};
DE            EC=3.5.4.16 {ECO:0000255|HAMAP-Rule:MF_00223};
DE   AltName: Full=GTP cyclohydrolase I {ECO:0000255|HAMAP-Rule:MF_00223};
DE            Short=GTP-CH-I {ECO:0000255|HAMAP-Rule:MF_00223};
GN   Name=folE {ECO:0000255|HAMAP-Rule:MF_00223};
GN   OrderedLocusNames=CYA_2792;
OS   Synechococcus sp. (strain JA-3-3Ab) (Cyanobacteria bacterium Yellowstone
OS   A-Prime).
OC   Bacteria; Bacillati; Cyanobacteriota; Cyanophyceae; Synechococcales;
OC   Synechococcaceae; Synechococcus.
OX   NCBI_TaxID=321327;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=JA-3-3Ab;
RX   PubMed=18059494; DOI=10.1038/ismej.2007.46;
RA   Bhaya D., Grossman A.R., Steunou A.-S., Khuri N., Cohan F.M., Hamamura N.,
RA   Melendrez M.C., Bateson M.M., Ward D.M., Heidelberg J.F.;
RT   "Population level functional diversity in a microbial community revealed by
RT   comparative genomic and metagenomic analyses.";
RL   ISME J. 1:703-713(2007).
CC   -!- CATALYTIC ACTIVITY:
CC       Reaction=GTP + H2O = 7,8-dihydroneopterin 3'-triphosphate + formate +
CC         H(+); Xref=Rhea:RHEA:17473, ChEBI:CHEBI:15377, ChEBI:CHEBI:15378,
CC         ChEBI:CHEBI:15740, ChEBI:CHEBI:37565, ChEBI:CHEBI:58462; EC=3.5.4.16;
CC         Evidence={ECO:0000255|HAMAP-Rule:MF_00223};
CC   -!- PATHWAY: Cofactor biosynthesis; 7,8-dihydroneopterin triphosphate
CC       biosynthesis; 7,8-dihydroneopterin triphosphate from GTP: step 1/1.
CC       {ECO:0000255|HAMAP-Rule:MF_00223}.
CC   -!- SUBUNIT: Toroid-shaped homodecamer, composed of two pentamers of five
CC       dimers. {ECO:0000250}.
CC   -!- SIMILARITY: Belongs to the GTP cyclohydrolase I family.
CC       {ECO:0000255|HAMAP-Rule:MF_00223}.
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DR   EMBL; CP000239; ABD00894.1; -; Genomic_DNA.
DR   RefSeq; WP_011431564.1; NC_007775.1.
DR   AlphaFoldDB; Q2JR69; -.
DR   SMR; Q2JR69; -.
DR   STRING; 321327.CYA_2792; -.
DR   KEGG; cya:CYA_2792; -.
DR   eggNOG; COG0302; Bacteria.
DR   HOGENOM; CLU_049768_2_2_3; -.
DR   OrthoDB; 9801207at2; -.
DR   UniPathway; UPA00848; UER00151.
DR   GO; GO:0005737; C:cytoplasm; IEA:TreeGrafter.
DR   GO; GO:0005525; F:GTP binding; IEA:TreeGrafter.
DR   GO; GO:0003934; F:GTP cyclohydrolase I activity; IEA:UniProtKB-UniRule.
DR   GO; GO:0008270; F:zinc ion binding; IEA:UniProtKB-UniRule.
DR   GO; GO:0006730; P:one-carbon metabolic process; IEA:UniProtKB-UniRule.
DR   GO; GO:0006729; P:tetrahydrobiopterin biosynthetic process; IEA:TreeGrafter.
DR   GO; GO:0046654; P:tetrahydrofolate biosynthetic process; IEA:UniProtKB-UniRule.
DR   CDD; cd00642; GTP_cyclohydro1; 1.
DR   FunFam; 3.30.1130.10:FF:000012; GTP cyclohydrolase 1; 1.
DR   Gene3D; 1.10.286.10; -; 1.
DR   Gene3D; 3.30.1130.10; -; 1.
DR   HAMAP; MF_00223; FolE; 1.
DR   InterPro; IPR043133; GTP-CH-I_C/QueF.
DR   InterPro; IPR043134; GTP-CH-I_N.
DR   InterPro; IPR001474; GTP_CycHdrlase_I.
DR   InterPro; IPR018234; GTP_CycHdrlase_I_CS.
DR   InterPro; IPR020602; GTP_CycHdrlase_I_dom.
DR   NCBIfam; TIGR00063; folE; 1.
DR   NCBIfam; NF006825; PRK09347.1-2; 1.
DR   NCBIfam; NF006826; PRK09347.1-3; 1.
DR   PANTHER; PTHR11109:SF7; GTP CYCLOHYDROLASE 1; 1.
DR   PANTHER; PTHR11109; GTP CYCLOHYDROLASE I; 1.
DR   Pfam; PF01227; GTP_cyclohydroI; 1.
DR   SUPFAM; SSF55620; Tetrahydrobiopterin biosynthesis enzymes-like; 1.
DR   PROSITE; PS00859; GTP_CYCLOHYDROL_1_1; 1.
DR   PROSITE; PS00860; GTP_CYCLOHYDROL_1_2; 1.
PE   3: Inferred from homology;
KW   GTP-binding; Hydrolase; Metal-binding; Nucleotide-binding;
KW   One-carbon metabolism; Zinc.
FT   CHAIN           1..229
FT                   /note="GTP cyclohydrolase 1"
FT                   /id="PRO_1000043752"
FT   BINDING         116
FT                   /ligand="Zn(2+)"
FT                   /ligand_id="ChEBI:CHEBI:29105"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00223"
FT   BINDING         119
FT                   /ligand="Zn(2+)"
FT                   /ligand_id="ChEBI:CHEBI:29105"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00223"
FT   BINDING         187
FT                   /ligand="Zn(2+)"
FT                   /ligand_id="ChEBI:CHEBI:29105"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00223"
SQ   SEQUENCE   229 AA;  25520 MW;  710D8327884B06A4 CRC64;
     MTLAKPGSGA EFRLNNKANL KSRLVRDLSH AAGQEPEGSE SLDPAMVAAV ETLLRGIGED
     PQREGLKKTP ERVVAALKFL TSGYRQSLED LINGAIFDEG HDEMVLLRDI TLFSLCEHHL
     LPFIGKAHVA YIPRQKVVGL SKIARIVEMY SRRLQVQERL TRQIAEALMT MLDPYGVGVV
     IEATHMCMVM RGVQKPGSWT VTSSMVGVFQ EDPRTREEFL SLIRHPSNL
//