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SUMMARY: Glucose-6-phosphate-dependent glycogen synthase from Dictyostelium discoideum was purified and characterized. Several nucleoside phosphates inhibited enzyme activity at their physiological concentrations (about 10−4 m). Glucose 6-phosphate and UDPglucose released these inhibitions at levels above their physiological concentrations. Unless compartmentation is invoked, experiments suggest that the glucose-6-phosphate-dependent enzyme is inactive in vivo.
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