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Journal of Experimental Botany, Vol 49, 1761-1765, Copyright © 1998 by Oxford University Press

ARTICLES

Short communication. A steep Ca2-dependence of a K channel in a unicellular green alga

C Bauer, C Plieth, U Hansen, W Simonis and G Schonknecht
Molecular Plant Physiology and Biophysics, Botany 1, University of Wurzburg, Julius-von-Sachs-Platz 2, D-97082 Wurzburg, Germany; Institute for Applied Physics, University of Kiel, Olshausenstr. 40, D-24098 Kiel, Germany; Corresponding author

An increase of cytosolic Ca2 in the unicellular green alga Eremosphaera viridis activities Ca2-dependent K channels causing a hyperpolarization of the plasma membrane. Data from parallel calcium, and potential measurements were combined with I/V relationships. This yielded a steep Ca2-dependence of K channels with a co-operativity of 4 and an affinity of 300 nM.Key words: Eremosphaera viridis, plasma membrane, Ca2-dependent K channel, co-operative binding.
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