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Susceptibility of UDP-Glucose:(1,3)-beta-Glucan Synthase to Inactivation by Phospholipases and Trypsin
1Department of Food Science, New Jersey Agricultural Experiment Station, Cook College, Rutgers University, New Brunswick, New Jersey 08903.
Abstract:
UDP-glucose:(1,3)-beta-glucan synthase from Beta vulgaris L. was rapidly inactivated by treatment with phospholipases C, D, and A(2). Enzyme activity could not be restored to the phospholipase-treated enzyme by the addition of phosphatidylethanolamine or other phospholipids. Membrane-bound and solubilized glucan synthase were also trypsin-labile with inactivation rates equal in the presence or absence of divalent cations or chelators. Gradual activity declines were observed in membranes incubated with divalent cations, but not with chelators.
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