Key result
Alanine replacement of R231 or R237 in the S4 domain of KCNQ1 produced constitutive activation, demonstrating that its unique S4 charge paucity facilitates conversion to a leak channel.
Population
KCNQ1 and KCNQ4 potassium channel complexes
Comparison
Alanine-scanning mutagenesis of the… vs Wild-type KCNQ1, KCNQ4, and other Kv channels
Design
Preclinical
Authors
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No immediate clinical implications for channelopathies; leaves open validation in human disease models.
The unique S4 charge paucity of KCNQ1 facilitates its conversion to a leak channel by ancillary subunits, providing mechanistic insight into potassium channel voltage dependence.
Panaghie et al. (2007) studied this question. Alanine-scanning mutagenesis of KCNQ1 S4 charges vs. Wild-type KCNQ1 channels was evaluated on Channel activation (constitutive activation). Alanine replacement of R231 or R237 in the S4 domain of KCNQ1 produced constitutive activation, demonstrating that its unique S4 charge paucity facilitates conversion to a leak channel.
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