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. 1984 Jul;75(3):586–591. doi: 10.1104/pp.75.3.586

Effects of Vanadate on the Plasma Membrane ATPase of Red Beet and Corn 1

Sharman D O'Neill 1, Roger M Spanswick 1
PMCID: PMC1066959  PMID: 16663670

Abstract

The effect of vanadate on the plant plasma membrane ATPase were investigated in plasma membrane fractions derived from corn roots (Zea mays L.) and red beets (Beta vulgaris L.). The Ki for vanadate inhibition of the plasma membrane ATPase from corn roots and red beets was between 6 and 15 micromolar vanadate. In both membrane fractions, 80% to 90% of the total ATPase was inhibited at vanadate concentrations below 100 micromolar. Vanadate inhibition was optimal at pH 6.5, enhanced by the presence of K+, and was partially reversed by 1 millimolar EDTA. The Mg:ATP kinetics for the plasma membrane ATPase were hyperbolic in both the absence and presence of vanadate. Vanadate decreased both the Km and Vmax of the red beet plasma membrane ATPase, indicating that vanadate inhibits the ATPase uncompetitively. These results indicate many similarities with respect to vanadate inhibition between the plant plasma membrane ATPase and other major iontranslocating ATPases from fungal and animal cells. The high sensitivity to vanadate reported here, however, differs from other reports of vanadate inhibition of the plant plasma membrane ATPase from corn, beets, and in some instances oats.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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