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Calcium-independent K+-selective channel from chromaffin granule membranes

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Summary

Intact adrenal chromaffin granules and purified granule membrane ghosts were allowed to fuse with acidic phospholipid planar bilayer membranes in the presence of Ca2+ (1 mm). From both preparations, we were able to detect a large conductance potassium channel (ca. 160 pS in symmetrical 400 mm K+), which was highly selective for K+ over Na+ (P k/P Na = 11) as estimated from the reversal potential of the channel current. Channel activity was unaffected by charybdotoxin, a blocker of the [Ca2+] activated K+ channel of large conductance. Furthermore, this channel proved quite different from the previously described channels from other types of secretory vesicle preparations, not only in its selectivity and conductance, but also in its insensitivity to both calcium and potential across the bilayer. We conclude that the chromaffin granule membrane contains a K+-selective channel with large conductance. We suggest that the role of this channel may include ion movement during granule assembly or recycling, and do not rule out events leading to exocytosis.

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  1. Laboratory of Cell Biology and Genetics, National Institutes of Health, NIDDK, 20892, Bethesda, Maryland

    Nelson Arispe, Harvey B. Pollard & Eduardo Rojas

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  1. Nelson Arispe
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  2. Harvey B. Pollard
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Arispe, N., Pollard, H.B. & Rojas, E. Calcium-independent K+-selective channel from chromaffin granule membranes. J. Membarin Biol. 130, 191–202 (1992). https://doi.org/10.1007/BF00231896

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  • DOI: https://doi.org/10.1007/BF00231896

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