Neurochemistry International Vol.2, pp.27-43. Pergamon Press Ltd. ]980. Printed in Great Britain. CHEMICAL REPRESENTATION OF ION FLUX GATING IN EXCITABLE BIOMEMBRANES i
نویسندگان
چکیده
A review on molecularly specific gating schemes for ion fluxes in excitable biomembranes is presented. Basic electrophysiological data are discussed in terms of recent relaxation kinetic results on isolated acetylcholine receptor-lipid complexes and on acetylcholinesterase from electric fish. A key conclusion of this assay is that rapid bioelectrical signals based on transient permeability changes in axonal and synaptic parts of excitable biomembranes appear to be specialized cases of a more general chemically dissipative control principle involving activator-receptor interactions and metastability for the activated-conducting state.
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Pii: S0747-5632(98)00023-5
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Unequivocal information about the gating mechanism controlling channel opening and closing can be obtained from a study of the transmembrane flow of ions (Neumann and Bernhardt, 1977). Transport of ions can be indicated electrically (e.g., conductance measurement), or chemically, by direct determination of ion concentrations. Very promising are electrical measurements with planar bilayers into ...
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