Key result
Closed inactivation gates in Shaker channels accelerate activation gate opening and slow closing via energetic coupling.
Population
Shaker potassium channels (including engineered V474C mutant)
Design
Preclinical
Authors
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Extends Kv channel gating models from invertebrate data; clinical relevance to human cardiac excitability remains untested.
Demonstrates fundamental cross-talk between activation and slow inactivation gates in potassium channels, which is likely a key factor in controlling ion flux across membranes.
Panyi et al. (2006) studied Shaker potassium channels. V474C mutation and Cs(+) ion trapping was evaluated on Rate of activation gate movement. A closed inactivation gate in Shaker potassium channels favors faster opening and slower closing of the activation gate, demonstrating energetic coupling between the two gates.
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