Short communication. A steep Ca2[IMAGE]-dependence of a K[IMAGE] channel in a unicellular green alga |
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| Authors: | Bauer, C Plieth, C Hansen, U Simonis, W Schonknecht, G |
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| Affiliation: | 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 |
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| Abstract: | An increase of cytosolic Ca2 in theunicellular green alga Eremosphaera viridis activitiesCa2-dependentK channels causing a hyperpolarization ofthe plasma membrane. Data from parallel calcium, and potential measurementswere combined with I/V relationships. This yielded asteep Ca2-dependence ofK channels with a co-operativity of 4 andan affinity of 300 nM.Key words: Eremosphaera viridis,plasma membrane, Ca2-dependentK channel, co-operative binding. |
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