1887

Abstract

The efflux of Ca from the yeast is induced by the influx of mono- or divalent cations. The mechanism of the tight coupling between K influx and Ca efflux was investigated. Two possibilities were examined: (1) Ca efflux is induced only by the carriermediated and energy-dependent K uptake or (2) Ca efflux can be induced by electric coupling to K influx which is driven by its inward electrochemical gradient in the presence of K ionophores. It was found that K influx in the presence of valinomycin or nigericin and in the absence of glucose did not induce Ca efflux. It is suggested, therefore, that the coupling is mediated by antiport carriers which exchange Ca and K.

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/content/journal/micro/10.1099/00221287-128-11-2611
1982-11-01
2021-08-02
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