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. 1978 Mar;75(3):1232–1236. doi: 10.1073/pnas.75.3.1232

ATP-dependent Ca2+ uptake into plant membrane vesicles

Joachim Gross 1, Dieter Marmé 1
PMCID: PMC411444  PMID: 16592510

Abstract

Membrane vesicles were extracted from etiolated and light-grown plants, a plant cell suspension culture, and an alga. Upon addition of ATP and Mg2+, active Ca2+ uptake into the vesicles against a concentration gradient was shown. The dependence of this uptake on ATP and Mg2+ concentrations, pH, and temperature is described. In the absence of oxalate, equilibrium between Ca2+ uptake and efflux was reached after about 30 min. In the presence of oxalate, Ca2+ accumulation continued for at least 120 min. Ca2+ efflux from preloaded vesicles did not depend on ATP. Addition of the ionophores A23187 and Ro 20-0006/006 caused an immediate release of accumulated free Ca2+. ATP-dependent Ca2+ uptake was not inhibited by 10 μM oligomycin.

Keywords: nucleotide specificity, ionophores, oxalate, Mg2+-ATPase, adenylate kinase

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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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