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RIBA_ECO81
ID   RIBA_ECO81              Reviewed;         196 AA.
AC   B7MUB9;
DT   28-JUL-2009, integrated into UniProtKB/Swiss-Prot.
DT   24-MAR-2009, sequence version 1.
DT   03-AUG-2022, entry version 68.
DE   RecName: Full=GTP cyclohydrolase-2 {ECO:0000255|HAMAP-Rule:MF_00179};
DE            EC=3.5.4.25 {ECO:0000255|HAMAP-Rule:MF_00179};
DE   AltName: Full=GTP cyclohydrolase II {ECO:0000255|HAMAP-Rule:MF_00179};
GN   Name=ribA {ECO:0000255|HAMAP-Rule:MF_00179}; OrderedLocusNames=ECED1_1487;
OS   Escherichia coli O81 (strain ED1a).
OC   Bacteria; Proteobacteria; Gammaproteobacteria; Enterobacterales;
OC   Enterobacteriaceae; Escherichia.
OX   NCBI_TaxID=585397;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=ED1a;
RX   PubMed=19165319; DOI=10.1371/journal.pgen.1000344;
RA   Touchon M., Hoede C., Tenaillon O., Barbe V., Baeriswyl S., Bidet P.,
RA   Bingen E., Bonacorsi S., Bouchier C., Bouvet O., Calteau A., Chiapello H.,
RA   Clermont O., Cruveiller S., Danchin A., Diard M., Dossat C., Karoui M.E.,
RA   Frapy E., Garry L., Ghigo J.M., Gilles A.M., Johnson J., Le Bouguenec C.,
RA   Lescat M., Mangenot S., Martinez-Jehanne V., Matic I., Nassif X., Oztas S.,
RA   Petit M.A., Pichon C., Rouy Z., Ruf C.S., Schneider D., Tourret J.,
RA   Vacherie B., Vallenet D., Medigue C., Rocha E.P.C., Denamur E.;
RT   "Organised genome dynamics in the Escherichia coli species results in
RT   highly diverse adaptive paths.";
RL   PLoS Genet. 5:E1000344-E1000344(2009).
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:0000255|HAMAP-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:0000255|HAMAP-Rule:MF_00179};
CC   -!- COFACTOR:
CC       Name=Zn(2+); Xref=ChEBI:CHEBI:29105;
CC         Evidence={ECO:0000255|HAMAP-Rule:MF_00179};
CC       Note=Binds 1 zinc ion per subunit. {ECO:0000255|HAMAP-Rule:MF_00179};
CC   -!- PATHWAY: Cofactor biosynthesis; riboflavin biosynthesis; 5-amino-6-(D-
CC       ribitylamino)uracil from GTP: step 1/4. {ECO:0000255|HAMAP-
CC       Rule:MF_00179}.
CC   -!- SUBUNIT: Homodimer. {ECO:0000255|HAMAP-Rule:MF_00179}.
CC   -!- SIMILARITY: Belongs to the GTP cyclohydrolase II family.
CC       {ECO:0000255|HAMAP-Rule:MF_00179}.
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DR   EMBL; CU928162; CAR07685.2; -; Genomic_DNA.
DR   RefSeq; WP_001176294.1; NC_011745.1.
DR   AlphaFoldDB; B7MUB9; -.
DR   SMR; B7MUB9; -.
DR   EnsemblBacteria; CAR07685; CAR07685; ECED1_1487.
DR   KEGG; ecq:ECED1_1487; -.
DR   HOGENOM; CLU_020273_2_1_6; -.
DR   OMA; GQGFILY; -.
DR   UniPathway; UPA00275; UER00400.
DR   Proteomes; UP000000748; Chromosome.
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; -; 1.
DR   HAMAP; MF_00179; RibA; 1.
DR   InterPro; IPR032677; GTP_cyclohydro_II.
DR   InterPro; IPR000926; RibA.
DR   InterPro; IPR036144; RibA-like_sf.
DR   Pfam; PF00925; GTP_cyclohydro2; 1.
DR   SUPFAM; SSF142695; SSF142695; 1.
DR   TIGRFAMs; TIGR00505; ribA; 1.
PE   3: Inferred from homology;
KW   GTP-binding; Hydrolase; Metal-binding; Nucleotide-binding;
KW   Riboflavin biosynthesis; Zinc.
FT   CHAIN           1..196
FT                   /note="GTP cyclohydrolase-2"
FT                   /id="PRO_1000193764"
FT   ACT_SITE        126
FT                   /note="Proton acceptor"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00179"
FT   ACT_SITE        128
FT                   /note="Nucleophile"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00179"
FT   BINDING         49..53
FT                   /ligand="GTP"
FT                   /ligand_id="ChEBI:CHEBI:37565"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00179"
FT   BINDING         54
FT                   /ligand="Zn(2+)"
FT                   /ligand_id="ChEBI:CHEBI:29105"
FT                   /ligand_note="catalytic"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00179"
FT   BINDING         65
FT                   /ligand="Zn(2+)"
FT                   /ligand_id="ChEBI:CHEBI:29105"
FT                   /ligand_note="catalytic"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00179"
FT   BINDING         67
FT                   /ligand="Zn(2+)"
FT                   /ligand_id="ChEBI:CHEBI:29105"
FT                   /ligand_note="catalytic"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00179"
FT   BINDING         70
FT                   /ligand="GTP"
FT                   /ligand_id="ChEBI:CHEBI:37565"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00179"
FT   BINDING         92..94
FT                   /ligand="GTP"
FT                   /ligand_id="ChEBI:CHEBI:37565"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00179"
FT   BINDING         114
FT                   /ligand="GTP"
FT                   /ligand_id="ChEBI:CHEBI:37565"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00179"
FT   BINDING         149
FT                   /ligand="GTP"
FT                   /ligand_id="ChEBI:CHEBI:37565"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00179"
FT   BINDING         154
FT                   /ligand="GTP"
FT                   /ligand_id="ChEBI:CHEBI:37565"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00179"
SQ   SEQUENCE   196 AA;  21850 MW;  49BFED98F480862E CRC64;
     MQLKRVAEAK LPTPWGDFLM VGFEELATGH DHVALVYGDI SGHTPVLARV HSECLTGDAL
     FSLRCDCGFQ LEAALTQIAE EGRGILLYHR QEGRNIGLLN KIRAYALQDQ GYDTVEANHQ
     LGFAADERDF TLCADMFKLL GVNEVRLLTN NPKKVEILTE AGINIIERVP LIVGRNPNNE
     HYLDTKAEKM GHLLNK
 
 
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