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- W1530897229 abstract "A synergistic activation of phosphorylase kinase by Ca2+ plus Mg2+ was found to be the primary cause of the hysteresis, or lag, in the phosphorylase kinase reaction. Preincubation of the enzyme for short times with Ca2+ plus Mg2+ resulted in an approximately 7-fold increase in the kinase activity in subsequent assays with phosphorylase b or phosphorylase kinase as substrates, whereas preincubation with each metal ion by itself had no effect. Maximal activation through preincubation with Ca2+ plus Mg2+ occurred in 1 min 45 s and was readily reversed by chelation of both metal ions. As a result of the activation, the progress curve of phosphorylase b conversion at pH 6.8 was found to be nearly linear. Activation by Ca2+ plus Mg2+ was not apparent when subsequent assays were carried out at pH 8.2, or when previously autophosphorylated enzyme was used. Furthermore, the synergistic activation was found to occur significantly slower and/or to decrease in the presence of ATP, phosphorylase b, beta-glycerophosphate, and inorganic phosphate. How the synergistic activation by Ca2+ plus Mg2+ relates to autophosphorylation and the lag in the phosphorylase kinase reaction is discussed." @default.
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- W1530897229 date "1981-11-01" @default.
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- W1530897229 title "Synergistic activation by Ca2+ and Mg2+ as the primary cause for hysteresis in the phosphorylase kinase reactions." @default.
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- W1530897229 doi "https://doi.org/10.1016/s0021-9258(19)68555-8" @default.
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