[phosphorylase] phosphatase

[phosphorylase] phosphatase
[phos·phor·y·lase] phos·pha·tase (fos-forґə-lās fosґfə-tās″) [EC 3.1.3.17] an enzyme of the hydrolase class that catalyzes the cleavage of a phosphoryl group from (active) glycogen phosphorylase a to form (inactive) phosphorylase b; the reaction is part of the mechanism of regulation of glycogenolysis. Recently, this enzyme has been considered to be an activity of the more general enzyme protein phosphatase 1.

Medical dictionary. 2011.

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  • (phosphorylase) phosphatase — In enzymology, a [phosphorylase] phosphatase (EC number|3.1.3.17) is an enzyme that catalyzes the chemical reaction: [phosphorylase a] + 4 H2O ightleftharpoons 2 [phosphorylase b] + 4 phosphateThus, the two substrates of this enzyme are… …   Wikipedia

  • Phosphorylase — is a family of allosteric enzymes that catalyze the production of glucose 1 phosphate from a polyglucose such as glycogen, starch or maltodextrin.FunctionMore generally, phosphorylases are enzymes that catalyze the addition of a phosphate group… …   Wikipedia

  • Phosphatase — Phosphatasen Enzymklassifikationen EC, Kategorie …   Deutsch Wikipedia

  • Phosphorylase — Dieser Artikel oder Abschnitt bedarf einer Überarbeitung. Hilf mit, ihn zu verbessern, und entferne anschließend diese Markierung. Als Phosphorylasen bezeichnet man eine Familie allosterischer Enzyme, welche die Produktion von Glukose 1 Phosphat… …   Deutsch Wikipedia

  • phosphorylase — A phosphorylated enzyme cleaving poly(1,4 α d glucosyl)n with orthophosphate to form poly(1,4 α d glucosyl)n−1 and α d glucose 1 phosphate. SYN: α glucan p., glycogen p., P enzyme, p. a, polyphosphorylase. p. a SYN: p.. p. b dephosphorylated p. a …   Medical dictionary

  • Phosphatase — A phosphatase is an enzyme that removes a phosphate group from its substrate by hydrolysing phosphoric acid monoesters into a phosphate ion and a molecule with a free hydroxyl group (see dephosphorylation). This action is directly opposite to… …   Wikipedia

  • protein phosphatase 1 — a specific phosphoprotein phosphatase (q.v.) that catalyzes the dephosphorylation of several enzymes involved in the regulation of glycogen metabolism: phosphorylase kinase, glycogen phosphorylase a, and glycogen synthase b. The enzyme activity… …   Medical dictionary

  • glycogen phosphorylase — gly·co·gen phos·phor·y·lase (gliґko jən fos forґə lās) [EC 2.4.1.1] an enzyme of the transferase class that catalyzes the phosphorolysis of a terminal α 1,4 glycosidic bond at the non reducing end of a glycogen molecule,… …   Medical dictionary

  • Glycogen phosphorylase — Phosphorylase The crystal structure of the rabit muscle glycogen phosphorylase AMP complex. AMP allosteric site (yellow), phosporylated Ser14 (orange), glycogen binding site (blue), catalytic site (red).[1] …   Wikipedia

  • Phosphoprotein phosphatase — is an enzyme which dephosphorylates certain phosphorylated proteins.Overview of control of enzyme activityThe control of enzyme activity involves covalent modifications, including the addition of phosphate ions to serine, threonine and tyrosine… …   Wikipedia

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