Why the study?
The structural dynamics of the slide helix during cholesterol-induced channel inactivation are not well understood.
Population
KirBac1.1 channels and slide helix single-cysteine mutants in liposomes
Comparison
Cholesterol exposure vs varying membrane lipid compositions
Design
In vitro biophysical study
Key result
High concentrations of cholesterol completely abolish the transport activity of wild-type KirBac1.1 channels in PC/PG membranes, likely through direct interaction with the slide helix.
Authors
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May relate to cholesterol effects on cardiac Kir function; leaves open mammalian translation.
Cholesterol inhibits KirBac1.1 channel activity by directly interacting with the slide helix, altering its membrane penetration depth and acting as a conformational switch.
Bysack et al. (2026) studied this question. Cholesterol was evaluated on KirBac1.1 channel activity and structural dynamics. High concentrations of cholesterol completely abolish the transport activity of wild-type KirBac1.1 channels in PC/PG membranes, likely through direct interaction with the slide helix.