Abstract
The primary structures of the Na+ channel a-subunits from several species have now been deduced from cDNA sequences, and complete primary structures of all of the subunits of skeletal muscle L-type Ca 2+ channels have been defined. Current research on voltage-gated ion channels is focusing on defining the structural components responsible for specific aspects of channel function. Recent experiments have identified regions of these channels that are important for voltage-dependent activation and inactivation, ion conductance, regulation by protein phosphorylation, and modulation by drugs and neurotoxins using a combination of antibody mapping and site-directed mutagenesis approaches. The results form the outlines of a structural map of ion channel function.
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