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- W2100557540 abstract "Electrical activity in nerve, skeletal muscle, and heart requires finely tuned activity of voltage-gated Na+ channels that open and then enter a nonconducting inactivated state upon depolarization. Inactivation occurs when the gate, the cytoplasmic loop linking domains III and IV of the α subunit, occludes the open pore. Subtle destabilization of inactivation by mutation is causally associated with diverse human disease. Here we show for the first time that the inactivation gate is a molecular complex consisting of the III-IV loop and the COOH terminus (C-T), which is necessary to stabilize the closed gate and minimize channel reopening. When this interaction is disrupted by mutation, inactivation is destabilized allowing a small, but important, fraction of channels to reopen, conduct inward current, and delay cellular repolarization. Thus, our results demonstrate for the first time that physiologically crucial stabilization of inactivation of the Na+ channel requires complex interactions of intracellular structures and indicate a novel structural role of the C-T domain in this process." @default.
- W2100557540 created "2016-06-24" @default.
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- W2100557540 date "2004-01-26" @default.
- W2100557540 modified "2023-10-11" @default.
- W2100557540 title "The Na+ Channel Inactivation Gate Is a Molecular Complex" @default.
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- W2100557540 doi "https://doi.org/10.1085/jgp.200308929" @default.
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