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Subcellular localization of H+-ATPase from pumpkin hypocotyls (Cucurbita maxima L.) by membrane fractionation

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Abstract

A new method of preparing sealed vesicles from membrane fractions of pumpkin hypocotyls in ethanolamine-containing buffers was used to investigate the subcellular localization of H+-ATPase measured as nigericin-stimulated ATPase. In a fluorescence-quench assay, the H+ pump was directly demonstrated. The H+ pump was substrate-specific for Mg·ATP and 0.1 mM diethylstilbestrol completely prevented the development of a Δ pH. The presence of unsupecific phosphatase hampered the detection of nigericin-stimulated ATPase. Unspecific phosphatases could be demonstrated by comparing the broad substrate specificity of the hydrolytic activities of the fractions with the clear preference for Mg·ATP as the substrate for the proton pump. Inhibitor studies showed that neither orthovanadate nor molybdate are absolutely specific for ATPase or acid phosphatase, respectively. Diethylstilbestrol seemed to be a specific inhibitor of ATPase activity in fractions containing nigericin-stimulated ATPase, but it stimulated acid phosphatase which tended to obscure its effect on ATPase activity. Nigericin-stimulated ATPase had its optimum at pH 6.0 and the nigericin effect was K+-dependent. The combination of valinomycin and carbonylcyanide m-chlorophenylhydrazone had a similar effect to nigericin, but singly these ionophores were much less stimulatory. After prolonged centrifugation on linear sucrose gradients, nigericin-stimulated ATPase correlated in dense fractions with plasma membrane markers but a part of it remained at the interphase. This lessdense part of the nigericin-stimulated ATPase could be derived from tonoplast vesicles because α-mannosidase, an enzyme of the vacuolar sap, remained in the upper part of the gradient. Nigericinstimulated ATPase did not correlate with the mitochondrial marker, cytochrome c oxidase, whereas azide inhibition of ATPase activity did.

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Abbreviations

CCCP:

carbonylcyanide m-chlorophenylhydrazone

DES:

dethyltilbestrol

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  1. Botanisches Institut der Universität, Venusbergweg 22, D-5300, Bonn 1, Germany

    Günther F. E. Scherer

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  1. Günther F. E. Scherer
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Scherer, G.F.E. Subcellular localization of H+-ATPase from pumpkin hypocotyls (Cucurbita maxima L.) by membrane fractionation. Planta 160, 348–356 (1984). https://doi.org/10.1007/BF00393416

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  • DOI: https://doi.org/10.1007/BF00393416

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