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. 1979 Jul;76(7):3102–3106. doi: 10.1073/pnas.76.7.3102

Active transport of calcium in Neurospora plasma membrane vesicles.

P Stroobant, G A Scarborough
PMCID: PMC383771  PMID: 40223

Abstract

Functionally inverted plasma membrane vesicles isolated from the eukaryotic microorganism Neurospora crassa catalyze Mg2+/ATP-dependent Ca2+ uptake. Inhibitors induced efflux studies and isotope-exchange experiments indicate that the Ca2+ is accumulated inside the vesicles against a concentration gradient of about 40-fold, and that the majority of the transported Ca2+ is present essentially in free solution. Comparisons of Mg2+/ATP-driven 45Ca2+ uptake and [14C]SCN-uptake with respect to the Mg2+/ATP concentration dependence, the effects of inhibitors, and the nucleotide and divalent cation specificities indicate that the energy for Ca2+ accumulation is derived from ATP hydrolysis catalyzed by the electrogenic plasma membrane ATPase. Energized Ca2+ uptake is stimulated by the permeant anion SCN- to a degree that varies reciprocally with the ability of this anion to dissipate the membrane potential, and is inhibited by K+ in the presence of nigericin. All of these data point to the conclusion that the active transport of Ca2+ across the Neurospora plasma membrane takes place via a Ca2+/H+ antiporter, which functions to pump Ca2+ out of the intact cell.

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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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