Key result
Shaker K channels enter a defunct state in potassium-free solutions due to an abnormal conformation that restricts S4 movement and alters gating kinetics.
Population
Shaker K channels (including wild-type, mutant L382A, and ShIR)
Design
Preclinical
Authors
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K+-free artifacts may confound voltage-gated channel studies; leaves open relevance to human cardiac Kv channels or therapies.
The study reveals that Shaker K channels undergo conformational changes in the voltage sensor when exposed to K+-free solutions, preventing stable recording of normal gating currents.
Melishchuk et al. (1998) studied this question. Potassium-free (0 K+) solutions was evaluated on Channel conductance and gating current. Shaker K channels enter a defunct state in potassium-free solutions due to an abnormal conformation that restricts S4 movement and alters gating kinetics.
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