Abstract
Membrane patches were excised from enzymatically dissocfated frog toe muscle. High-conductance anion channels could be induced in previously quiet patches by 20–120 s depolarizations beyond +20 mV and then studied in the potential range from −80 to +60 mV for a long time. From reversal potentials the estimated permeability ratiosP Cl/P Na andP Cl/P glucuronate were near 3.5 and 4, respectively. There were probably 5 or more conductance levels (substates) for a single channel, the most common in symmetrical 110 mM NaCl being 260 and 70 pS at 10°C. Gating was complex, with rapid and slow events and several gating modes, including periods of rapid flickering. Channels closed reversibly at potentials more negative than −50 mV. The channel was blocked by application to the cytoplasmic face of tannic acid, gallic acid, and zinc but not of DIDS or 9-anthracene-carboxylic acid, and it was blocked by extracellular zinc.
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Woll, K.H., Leibowitz, M.D., Neumcke, B. et al. A high-conductance anion channel in adult amphibian skeletal muscle. Pflugers Arch. 410, 632–640 (1987). https://doi.org/10.1007/BF00581324
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DOI: https://doi.org/10.1007/BF00581324