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Single-channel study of the cGMP-dependent conductance of retinal rods from incorporation of native vesicles into planar lipid bilayers

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Summary

Unitary currents through cGMP-dependent channels of retinal rods are observed following incorporation into planar lipid bilayers of native vesicles from purified rod outer segment membranes washed free of soluble and peripheral proteins. The influence of the concentration of cGMP, inhibitors (cis-diltiazem, tetracaine and Ag+) and divalent cations (Ca2+, Mg2+, and Co2+) on the conductance and open probability of the channel is described, as well as the voltage dependence of these effects. The cGMP dependence suggests the existence of four binding sites for cGMP and reveals that sequential binding of four cGMP molecules corresponds to the opening of four discrete conductance levels. Finally, we provide conclusive evidence that activated G-protein does not directly inactivate the cGMP-dependent channels of bovine retinal rods.

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  1. Laboratoire de Biophysique Moléculaire et Cellulaire, Unité de Recherche Associée 520 du Centre National de la Recherche Scientifique, Centre d'Etudes Nucléaires de Grenoble, 85x, 38041, Grenoble cedex, France

    Michèle Ildefonse & Nelly Bennett

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  1. Michèle Ildefonse
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  2. Nelly Bennett
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Ildefonse, M., Bennett, N. Single-channel study of the cGMP-dependent conductance of retinal rods from incorporation of native vesicles into planar lipid bilayers. J. Membrain Biol. 123, 133–147 (1991). https://doi.org/10.1007/BF01998084

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  • DOI: https://doi.org/10.1007/BF01998084

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