Key result
Mutations in the NaV1.5 C-terminal IQ domain or DIII-DIV linker reduce calmodulin binding, stabilize channel inactivation, and abolish lidocaine-induced stabilization of inactivation.
Calmodulin functionally couples distinct cytoplasmic domains of the NaV1.5 sodium channel, which has implications for genetic arrhythmias like Brugada Syndrome and lidocaine sensitivity.
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Should not alter lidocaine use in arrhythmia patients; hypothesis-generating for NaV1.5-calmodulin interactions in Brugada syndrome.
Potet et al. (2009) studied Brugada Syndrome / Cardiac conduction. NaV1.5 mutations (A1924T and DIII-DIV linker mutations) vs. Wild-type channels was evaluated on Calmodulin binding and channel inactivation. Mutations in the NaV1.5 C-terminal IQ domain or DIII-DIV linker reduce calmodulin binding, stabilize channel inactivation, and abolish lidocaine-induced stabilization of inactivation.
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