| phosphorylase |
1. any of a group of enzymes catalyzing phosphorolysis of glycosides, transferring the cleaved glycosyl group to inorganic phosphate. The term is usually qualified by adding the name of the substrate acted upon; when used alone it usually denotes glycogen phosphorylase (q.v.) in animals or starch phosphorylase in plants. 2. any of a group of transferases that catalyze the transfer of a phosphate group to an organic acceptor.
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| phosphorylase b |
phosphorylase kinase.
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| phosphorylase kinase |
[EC 2.7.1.38] an enzyme of the transferase class that catalyzes the phosphorylation of (inactive) glycogen phosphorylase b to form (active) glycogen phosphorylase a, a step in the cascade of reactions regulating glycogenolysis. The enzyme is itself activated via phosphorylation by cyclic-AMPdependent protein kinase, and one of its four subunits is identical to calmodulin. Deficiency of the enzyme in liver, an X-linked trait, causes phosphorylase b kinase deficiency.
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| phosphorylysis |
phosphorolysis.
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| phosphor- |
invisible' ink (tagging) applied to the front of the stamp in vertical bars (one, two, or three have been used on Canadian stamps) or around all four sides of the stamp that, when exposed to ultraviolet light, activates a sorting and canceling machine. Canada issued its first phosphor tagged stamps in 1962 in readiness for the installation of a British-made letter-facing machine in Winnipeg, Manitoba. Phosphor tagging
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