| pyrophosphatase | Any enzyme cleaving a pyrophosphate bond between two phosphoric groups, leaving one on each of the two fragments; e.g., inorganic pyrophosphatase, NAD+ p. (cleaves NAD, etc., to mononucleotides), ATP pyrophosphatase (cleaves inorganic pyrophosphate from ATP, leaving AMP). See: flavin adenine dinucleotide. (05 Mar 2000) |
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| pyrophosphatases | <enzyme> A group of enzymes within the class EC 3.6.1.- that catalyze the hydrolysis of diphosphate bonds, chiefly in nucleoside di- and triphosphates. They may liberate either a mono- or diphosphate. Registry number: EC 3.6.1.- (12 Dec 1998) |
| guanosine-3',5'-bis(diphosphate) 3'-pyrophosphatase | <enzyme> Catalyses breakdown of guanosine tetraphosphate into guanosine diphosphate and pyrophosphate; spot protein is isolated from e. Coli Registry number: EC 3.1.7.2 Synonym: ppgpp-3'-pyrophosphohydrolase, guanosine tetraphosphate-3'-pyrophosphohydrolase, spot protein, spot gene product, ppgpp pyrophosphorylase, ppgppase, guanosine-5'-diphosphate 3'-diphosphate pyrophosphorylase (26 Jun 1999) |
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| guanosine-5'-triphosphate, 3'-diphosphate pyrophosphatase | <enzyme> Catalyses the hydrolysis of guanosine 5'-triphosphate, 3'-diphosphate to yield guanosine 5'-diphosphate, 3'-diphosphate and orthophosphate; from E coli; also hydrolyzes other guanosine 5'-triphosphate derivatives with at least one unsubstituted phosphate group on the 3'-position, but not GTP, ATP or adenosine 5'-triphosphate, 3'-diphosphate Registry number: EC 3.6.1.40 Synonym: guanosine pentaphosphate phosphohydrolase, GTPdp pyrophosphatase, pppgpp 5'-phosphohydrolase, guanosine 5'-triphosphate-3'diphosphate 5'-phosphohydrolase, pppgpp-5'-phosphohydrolase, pppgpp-5'-phosphatase (26 Jun 1999) |
| nucleoside-diphosphosugar pyrophosphatase | <enzyme> Catalyses the conversion of xdp-sugar to xmp and sugar 1-phosphate Registry number: EC 3.6.1.- Synonym: ndp-sugar pyrophosphatase, nucleotide-sugar pyrophosphatase (26 Jun 1999) |
| inorganic pyrophosphatase | A phosphohydrolase catalyzing hydrolysis of inorganic pyrophosphate to two orthophosphates. (05 Mar 2000) |
| oligosaccharide-diphosphodolichol pyrophosphatase | <enzyme> From yeast microsomal membranes; hydrolyses the pyrophosphate bond of oligosaccharide-pyrophosphodolichol into oligosaccharide phosphates plus dolicholphosphate Registry number: EC 3.6.1.44 Synonym: ols-pp-dol pyrophosphatase, oligosaccharide-pyrophosphodolichol pyrophosphatase (26 Jun 1999) |
| thiamine pyrophosphatase | <enzyme> The coenzyme form of vitamin B1 (thiamine), deficiency of which causes beri beri. Forms the prosthetic group of pyruvate dehydrogenase, _ ketoglutarate dehydrogenase and transketolase, in which it is involved in transfer of a 2 carbon unit. Marker for the trans cisternae of the Golgi complex. (18 Nov 1997) |
| FAD pyrophosphatase | <enzyme> Hydrolyzes fad to flavin mononucleotide and AMP Registry number: EC 3.6.1.18 Synonym: flavin-adenine dinucleotide phosphohydrolase, fad phosphohydrolase (26 Jun 1999) |
| UDPglucose pyrophosphatase | <enzyme> Acts on udpg to form uridine monophosphate and glucose-1-phosphate Registry number: EC 3.6.1.- (26 Jun 1999) |
| UDP glucuronate pyrophosphatase | <enzyme> Udpga is converted to ump plus glucuronic acid-1-phosphate Registry number: EC 3.6.1.- Synonym: udp-glucuronic acid pyrophosphatase (26 Jun 1999) |
| farnesyl pyrophosphatase | <enzyme> Catalyses conversion of farnesyl pyrophosphate to pyrophosphate and farnesol Registry number: EC 3.6.1.- Synonym: fppase (26 Jun 1999) |