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IXTPA_CLOTE
ID   IXTPA_CLOTE             Reviewed;         201 AA.
AC   Q891I4;
DT   26-APR-2005, integrated into UniProtKB/Swiss-Prot.
DT   01-JUN-2003, sequence version 1.
DT   03-AUG-2022, entry version 101.
DE   RecName: Full=dITP/XTP pyrophosphatase {ECO:0000255|HAMAP-Rule:MF_01405};
DE            EC=3.6.1.66 {ECO:0000255|HAMAP-Rule:MF_01405};
DE   AltName: Full=Non-canonical purine NTP pyrophosphatase {ECO:0000255|HAMAP-Rule:MF_01405};
DE   AltName: Full=Non-standard purine NTP pyrophosphatase {ECO:0000255|HAMAP-Rule:MF_01405};
DE   AltName: Full=Nucleoside-triphosphate diphosphatase {ECO:0000255|HAMAP-Rule:MF_01405};
DE   AltName: Full=Nucleoside-triphosphate pyrophosphatase {ECO:0000255|HAMAP-Rule:MF_01405};
DE            Short=NTPase {ECO:0000255|HAMAP-Rule:MF_01405};
GN   OrderedLocusNames=CTC_02388;
OS   Clostridium tetani (strain Massachusetts / E88).
OC   Bacteria; Firmicutes; Clostridia; Eubacteriales; Clostridiaceae;
OC   Clostridium.
OX   NCBI_TaxID=212717;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=Massachusetts / E88;
RX   PubMed=12552129; DOI=10.1073/pnas.0335853100;
RA   Brueggemann H., Baeumer S., Fricke W.F., Wiezer A., Liesegang H.,
RA   Decker I., Herzberg C., Martinez-Arias R., Merkl R., Henne A.,
RA   Gottschalk G.;
RT   "The genome sequence of Clostridium tetani, the causative agent of tetanus
RT   disease.";
RL   Proc. Natl. Acad. Sci. U.S.A. 100:1316-1321(2003).
CC   -!- FUNCTION: Pyrophosphatase that catalyzes the hydrolysis of nucleoside
CC       triphosphates to their monophosphate derivatives, with a high
CC       preference for the non-canonical purine nucleotides XTP (xanthosine
CC       triphosphate), dITP (deoxyinosine triphosphate) and ITP. Seems to
CC       function as a house-cleaning enzyme that removes non-canonical purine
CC       nucleotides from the nucleotide pool, thus preventing their
CC       incorporation into DNA/RNA and avoiding chromosomal lesions.
CC       {ECO:0000255|HAMAP-Rule:MF_01405}.
CC   -!- CATALYTIC ACTIVITY:
CC       Reaction=H2O + XTP = diphosphate + H(+) + XMP; Xref=Rhea:RHEA:28610,
CC         ChEBI:CHEBI:15377, ChEBI:CHEBI:15378, ChEBI:CHEBI:33019,
CC         ChEBI:CHEBI:57464, ChEBI:CHEBI:61314; EC=3.6.1.66;
CC         Evidence={ECO:0000255|HAMAP-Rule:MF_01405};
CC   -!- CATALYTIC ACTIVITY:
CC       Reaction=dITP + H2O = dIMP + diphosphate + H(+); Xref=Rhea:RHEA:28342,
CC         ChEBI:CHEBI:15377, ChEBI:CHEBI:15378, ChEBI:CHEBI:33019,
CC         ChEBI:CHEBI:61194, ChEBI:CHEBI:61382; EC=3.6.1.66;
CC         Evidence={ECO:0000255|HAMAP-Rule:MF_01405};
CC   -!- CATALYTIC ACTIVITY:
CC       Reaction=H2O + ITP = diphosphate + H(+) + IMP; Xref=Rhea:RHEA:29399,
CC         ChEBI:CHEBI:15377, ChEBI:CHEBI:15378, ChEBI:CHEBI:33019,
CC         ChEBI:CHEBI:58053, ChEBI:CHEBI:61402; EC=3.6.1.66;
CC         Evidence={ECO:0000255|HAMAP-Rule:MF_01405};
CC   -!- COFACTOR:
CC       Name=Mg(2+); Xref=ChEBI:CHEBI:18420;
CC         Evidence={ECO:0000255|HAMAP-Rule:MF_01405};
CC       Note=Binds 1 Mg(2+) ion per subunit. {ECO:0000255|HAMAP-Rule:MF_01405};
CC   -!- SUBUNIT: Homodimer. {ECO:0000255|HAMAP-Rule:MF_01405}.
CC   -!- SIMILARITY: Belongs to the HAM1 NTPase family. {ECO:0000255|HAMAP-
CC       Rule:MF_01405}.
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DR   EMBL; AE015927; AAO36861.1; -; Genomic_DNA.
DR   RefSeq; WP_011100522.1; NC_004557.1.
DR   AlphaFoldDB; Q891I4; -.
DR   SMR; Q891I4; -.
DR   STRING; 212717.CTC_02388; -.
DR   EnsemblBacteria; AAO36861; AAO36861; CTC_02388.
DR   GeneID; 64181129; -.
DR   KEGG; ctc:CTC_02388; -.
DR   HOGENOM; CLU_082080_0_2_9; -.
DR   OMA; DCFADDT; -.
DR   OrthoDB; 1824064at2; -.
DR   Proteomes; UP000001412; Chromosome.
DR   GO; GO:0035870; F:dITP diphosphatase activity; IEA:UniProtKB-EC.
DR   GO; GO:0036220; F:ITP diphosphatase activity; IEA:RHEA.
DR   GO; GO:0046872; F:metal ion binding; IEA:UniProtKB-KW.
DR   GO; GO:0017111; F:nucleoside-triphosphatase activity; IEA:InterPro.
DR   GO; GO:0000166; F:nucleotide binding; IEA:UniProtKB-KW.
DR   GO; GO:0036222; F:XTP diphosphatase activity; IEA:UniProtKB-EC.
DR   GO; GO:0009117; P:nucleotide metabolic process; IEA:UniProtKB-KW.
DR   GO; GO:0009146; P:purine nucleoside triphosphate catabolic process; IEA:UniProtKB-UniRule.
DR   CDD; cd00515; HAM1; 1.
DR   Gene3D; 3.90.950.10; -; 1.
DR   HAMAP; MF_01405; Non_canon_purine_NTPase; 1.
DR   InterPro; IPR020922; dITP/XTP_pyrophosphatase.
DR   InterPro; IPR002637; Ham1p-like.
DR   InterPro; IPR029001; ITPase-like_fam.
DR   PANTHER; PTHR11067; PTHR11067; 1.
DR   Pfam; PF01725; Ham1p_like; 1.
DR   SUPFAM; SSF52972; SSF52972; 1.
DR   TIGRFAMs; TIGR00042; TIGR00042; 1.
PE   3: Inferred from homology;
KW   Hydrolase; Magnesium; Metal-binding; Nucleotide metabolism;
KW   Nucleotide-binding; Reference proteome.
FT   CHAIN           1..201
FT                   /note="dITP/XTP pyrophosphatase"
FT                   /id="PRO_0000178156"
FT   ACT_SITE        73
FT                   /note="Proton acceptor"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01405"
FT   BINDING         8..13
FT                   /ligand="substrate"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01405"
FT   BINDING         41
FT                   /ligand="Mg(2+)"
FT                   /ligand_id="ChEBI:CHEBI:18420"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01405"
FT   BINDING         73
FT                   /ligand="Mg(2+)"
FT                   /ligand_id="ChEBI:CHEBI:18420"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01405"
FT   BINDING         74
FT                   /ligand="substrate"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01405"
FT   BINDING         154..157
FT                   /ligand="substrate"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01405"
FT   BINDING         177
FT                   /ligand="substrate"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01405"
FT   BINDING         182..183
FT                   /ligand="substrate"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01405"
SQ   SEQUENCE   201 AA;  22469 MW;  B75509761D6A3AEF CRC64;
     MKTVLLATNN ENKVNEIKDI LCELNLKVVS LKEVGINVEV EEDELTFMGN ALKKALTLYN
     MIDDKKYMVL ADDSGLSVDV LGGAPGVFSA RYAGEHGNSK ANNEKLLEDM KGLKNRKGKF
     ICAMALVIDK DNIIKVQGEV EGSIGYEEKG DNGFGYDPLF FVSKYNMTFA EMDKDIKNSI
     SHRRDALNKI KEKLKSYIED K
 
 
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