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- W2485130404 abstract "The microsomal fraction extracted from grapevine roots obtained from woody cuttings possesses Mg 2+ -dependent, monovalent cation-stimulated ATPase activity. Addition of BSA, PVPP, choline-CI, ethanolamine, glycerol-1-P besides EDTA and DTT to the homogenizing medium as preservative compounds was required in order to achieve a successful isolation. When microsomes were extracted according to HODGES and LEONARD (1974) by homogenizing root tissue in the presence of EDTA and DTT, the enzyme activity exhibited inhibition by Mg 2+ only partially relieved by K + , and properties of acid phosphatase rather than ATPase. Cation-stimulated ATPase of microsomes protected during homogenization was further characterized and it showed optimum activity at pH 7.0 in the presence of Mg 2+ plus K + . It was specific as a triphosphatase and Mg 2+ , rather than other divalent cations, was preferred as a cofactor. As monovalent stimulating cation, only NH 4 + could substitute for K + with equivalent efficiency. The kinetics of K + stimulation showed a biphasic pattern. Biochemical bases of ion uptake by grapevine seem to be similar to those clarified for annual plants." @default.
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- W2485130404 date "2015-12-17" @default.
- W2485130404 modified "2023-09-23" @default.
- W2485130404 title "Extraction and preliminary characterization of microsomal (Mg 2+ + K + )-ATPase activity of grapevine roots" @default.
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