ID   MPTA_METBF              Reviewed;         319 AA.
AC   Q46D91;
DT   29-MAY-2007, integrated into UniProtKB/Swiss-Prot.
DT   13-SEP-2005, sequence version 1.
DT   25-MAY-2022, entry version 95.
DE   RecName: Full=GTP cyclohydrolase MptA {ECO:0000255|HAMAP-Rule:MF_01527};
DE            EC=3.5.4.39 {ECO:0000255|HAMAP-Rule:MF_01527};
DE   AltName: Full=GTP cyclohydrolase IV {ECO:0000255|HAMAP-Rule:MF_01527};
GN   Name=mptA {ECO:0000255|HAMAP-Rule:MF_01527}; OrderedLocusNames=Mbar_A1183;
OS   Methanosarcina barkeri (strain Fusaro / DSM 804).
OC   Archaea; Euryarchaeota; Stenosarchaea group; Methanomicrobia;
OC   Methanosarcinales; Methanosarcinaceae; Methanosarcina.
OX   NCBI_TaxID=269797;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=Fusaro / DSM 804;
RX   PubMed=16980466; DOI=10.1128/jb.00810-06;
RA   Maeder D.L., Anderson I., Brettin T.S., Bruce D.C., Gilna P., Han C.S.,
RA   Lapidus A., Metcalf W.W., Saunders E., Tapia R., Sowers K.R.;
RT   "The Methanosarcina barkeri genome: comparative analysis with
RT   Methanosarcina acetivorans and Methanosarcina mazei reveals extensive
RT   rearrangement within methanosarcinal genomes.";
RL   J. Bacteriol. 188:7922-7931(2006).
CC   -!- FUNCTION: Converts GTP to 7,8-dihydro-D-neopterin 2',3'-cyclic
CC       phosphate, the first intermediate in the biosynthesis of coenzyme
CC       methanopterin. {ECO:0000255|HAMAP-Rule:MF_01527}.
CC   -!- CATALYTIC ACTIVITY:
CC       Reaction=GTP + H2O = 7,8-dihydroneopterin 2',3'-cyclic phosphate +
CC         diphosphate + formate + H(+); Xref=Rhea:RHEA:25860,
CC         ChEBI:CHEBI:15377, ChEBI:CHEBI:15378, ChEBI:CHEBI:15740,
CC         ChEBI:CHEBI:33019, ChEBI:CHEBI:37565, ChEBI:CHEBI:58854; EC=3.5.4.39;
CC         Evidence={ECO:0000255|HAMAP-Rule:MF_01527};
CC   -!- COFACTOR:
CC       Name=Fe(2+); Xref=ChEBI:CHEBI:29033;
CC         Evidence={ECO:0000255|HAMAP-Rule:MF_01527};
CC       Note=Binds 1 Fe(2+) ion per subunit. {ECO:0000255|HAMAP-Rule:MF_01527};
CC   -!- PATHWAY: Cofactor biosynthesis; 5,6,7,8-tetrahydromethanopterin
CC       biosynthesis. {ECO:0000255|HAMAP-Rule:MF_01527}.
CC   -!- SUBUNIT: Homodimer. {ECO:0000255|HAMAP-Rule:MF_01527}.
CC   -!- SIMILARITY: Belongs to the GTP cyclohydrolase IV family.
CC       {ECO:0000255|HAMAP-Rule:MF_01527}.
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DR   EMBL; CP000099; AAZ70151.1; -; Genomic_DNA.
DR   RefSeq; WP_011306199.1; NC_007355.1.
DR   AlphaFoldDB; Q46D91; -.
DR   SMR; Q46D91; -.
DR   STRING; 269797.Mbar_A1183; -.
DR   EnsemblBacteria; AAZ70151; AAZ70151; Mbar_A1183.
DR   GeneID; 3624530; -.
DR   KEGG; mba:Mbar_A1183; -.
DR   eggNOG; arCOG04301; Archaea.
DR   HOGENOM; CLU_062816_1_0_2; -.
DR   OMA; PCSQGMS; -.
DR   OrthoDB; 109805at2157; -.
DR   UniPathway; UPA00065; -.
DR   GO; GO:0003933; F:GTP cyclohydrolase activity; IEA:UniProtKB-UniRule.
DR   GO; GO:0005506; F:iron ion binding; IEA:UniProtKB-UniRule.
DR   HAMAP; MF_01527_A; GTP_cyclohydrol_A; 1.
DR   InterPro; IPR003801; GTP_cyclohydrolase_FolE2/MptA.
DR   InterPro; IPR022840; GTP_cyclohydrolase_MptA.
DR   PANTHER; PTHR36445; PTHR36445; 1.
DR   Pfam; PF02649; GCHY-1; 1.
DR   TIGRFAMs; TIGR00294; TIGR00294; 1.
PE   3: Inferred from homology;
KW   Hydrolase; Iron; Metal-binding.
FT   CHAIN           1..319
FT                   /note="GTP cyclohydrolase MptA"
FT                   /id="PRO_0000289539"
FT   SITE            167
FT                   /note="May be catalytically important"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01527"
SQ   SEQUENCE   319 AA;  35739 MW;  41B03E89FFE16B38 CRC64;
     MEHCTFNLPD VQASKPSIAI NLTRVGVTNV KKLVEIKRKD KRPIVLISTF DVFVDLPSDR
     KGANLSRNFE AVDEVLEKIL SMPVYEIEQL CSDIAHNLLG RHEYANQAEV RMTSEYMIRR
     ASPATGIKCQ EVVNIFAEAS AVRGQGNDDY FDVKKLIGAE VVGMTACPCA QEIMRDKAAN
     ELSELGVDKD TIIKFLERVP MATHNQRGRG IISIKVAHDF DVSLESIISI IDHSMSSSVY
     EVLKRADEKV VVETAHMNPK FVEDCVRTMA DNVVKEFPNL PDNAVITIKQ TNEESIHRHN
     AYAERVALMG DLRSEINHC