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Biophysical Journal 66: 149-152 (1994)
© 1994 the Biophysical Society

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Low single channel conductance of the major skeletal muscle chloride channel, ClC-1.

M Pusch, K Steinmeyer and T J Jentsch

Centre for Molecular Neurobiology (ZMMH), Hamburg University, Germany.

ABSTRACT

We expressed the skeletal muscle chloride channel, ClC-1, in HEK293 cells and investigated it with the patch-clamp technique. Macroscopic properties are similar to those obtained after expression in Xenopus oocytes, except that faster gating kinetics are observed in mammalian cells. Nonstationary noise analysis revealed that both rat and human ClC-1 have a low single channel conductance of about 1 pS. This finding may explain the lack of single-channel data for chloride channels from skeletal muscle despite its high macroscopic chloride conductance.




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