Abstract:Voltage-gated sodium channels (NaV) found in excitable cells are responsible for the rising phase of action potentials. These multi-domain transmembrane proteins are regulated by calmodulin (CaM), a highly conserved eukaryotic protein that mediates many calcium-triggered signaling events. Inactivation of sodium channels depends on CaM-mediated feedback during repolarization. In the neuronal sodium channel NaV1.2, CaM binds at least two well-separated sites: an intracellular ''inactivation'' loop between domain… Show more
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