Cation-activated ATPase activity of plasmalemma-enriched membrane preparations from maize coleoptiles
- 1 September 1979
- journal article
- research article
- Published by Springer Nature in Planta
- Vol. 146 (4) , 387-391
- https://doi.org/10.1007/bf00380849
Abstract
The ATPase activity present in plasmalemma-enriched preparations from maize coleoptiles shows an optimum at pH 6, a strong dependence on Mg2+, and is stimulated by K+ and other monovalent cations, both organic and inorganic. The activation of ATPase by K+ obeys Michaelis Menten kinetics, saturation being reached at 50 mM K+ concentration. K+, Mg2+-stimulated ATPase activity is strongly inhibited by N,N′-dicyclohexylcarbodiimide and by diethylstilbestrol and, to a lesser extent, by octylguanidine.Keywords
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