Voltage-dependent calcium channels from Paramecium cilia incorporated into planar lipid bilayers

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Science  27 Jul 1984:
Vol. 225, Issue 4660, pp. 427-428
DOI: 10.1126/science.6330895


Two different divalent cation-selective channels from Paramecium cilia were incorporated into planar lipid bilayers. Both channels were much more permeable to divalent than univalent cations, and one of them discriminated significantly among the divalent cations. The selectivity and voltage dependence of the latter channel are comparable to those of voltage-dependent calcium channels found in a variety of cells. A combined biochemical, biophysical, and genetic study of calcium channels is now possible.