FASEB J. Thermo Fisher Scientific
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The FASEB Journal, Vol 11, 600-608, Copyright © 1997 by The Federation of American Societies for Experimental Biology

RESEARCH COMMUNICATIONS

A novel explanation for fluctuations of ion current through narrow pores

YE Korchev, CL Bashford, GM Alder, PY Apel, DT Edmonds, AA Lev, K Nandi, AV Zima and CA Pasternak
Department of Physiology, Charing Cross and Westminister Medical School, University of London, U.K.

Fluctuation of ion current, between a high conductance and a low conductance state, through biological ion channels and pores is assumed to arise from conformational changes between an "open" and a "closed" configuration. Here we offer an additional mechanism that arises from changes in ionization of fixed charges within, or at the mouth of, a channel or pore. Our hypothesis, which is based on measurements of ion selectivity alongside ion current, applies to pores through some synthetic membranes and through channels-such as those created by certain toxins-that remain (at least partially) open in the low conductance state. It may also explain the phenomena of "open channel noise" and "substate behavior" that characterize several endogenous ion channels and should be considered when modeling the behavior of such channels.


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Copyright © 1997 by The Federation of American Societies for Experimental Biology.