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. 1992 Sep 1;89(17):8025-9.
doi: 10.1073/pnas.89.17.8025.

ATP-driven Ca2+/H+ antiport in acid vesicles from Dictyostelium

E K Rooney  1 , J D Gross
Affiliations

ATP-driven Ca2+/H+ antiport in acid vesicles from Dictyostelium

E K Rooney et al. Proc Natl Acad Sci U S A. .

Abstract

Amoebae of the cellular slime mold Dictyostelium discoideum possess an extensive and dynamic endomembrane system that includes many types of acidic vacuoles. A light membrane fraction from Dictyostelium, rich in vacuolar-type H(+)-ATPase, has been described [Padh, H., Lavasa, M. & Steck, T.L. (1989) J. Cell Biol. 108, 865-874]. Here, we show that this "acidosomal" fraction also contains a high-affinity vanadate-sensitive Ca2+ uptake activity that is stimulated by the pH gradient formed by the H(+)-ATPase. We attribute this Ca2+ uptake to the presence of a H(+)-countertransporting Ca(2+)-ATPase, pumping Ca2+ into an acidic compartment.

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