The effects of calmodulin (from spinach) on the Ca2+-dependent Cl--sensitive anion channel in the Chara plasmalemma (Okihara et al. 1991) were studied by the inside-out patch-clamp technique. The current of Cl- ions, which flowed through the channel at 1.0 μM Ca2+, tended to decrease irregularly with time. This tendency toward a decrease in the current was no longer apparent after application of calmodulin for some time. The activity of the channel was restored to a small extent or tended to increase during the early stages of application of calmodulin. Such a transient action of calmodulin on the channel activity was evident, at voltages more negative than –100 mV.
Copyright (C) 1993, The Japanese Society of Plant Physiologists
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