The Ca2+ permeation mechanism of the ryanodine receptor revealed by a multi-site ion model

Aihua Zhang, Hua Yu, Chunhong Liu and Song Chen
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Aihua Zhang: Peking University
Hua Yu: Peking University
Chunhong Liu: Peking University

Nature Communications, 2020, vol. 11, issue 1, 1-10

Abstract: Abstract Ryanodine receptors (RyR) are ion channels responsible for the release of Ca2+ from the sarco/endoplasmic reticulum and play a crucial role in the precise control of Ca2+ concentration in the cytosol. The detailed permeation mechanism of Ca2+ through RyR is still elusive. By using molecular dynamics simulations with a specially designed Ca2+ model, we show that multiple Ca2+ ions accumulate in the upper selectivity filter of RyR1, but only one Ca2+ can occupy and translocate in the narrow pore at a time, assisted by electrostatic repulsion from the Ca2+ within the upper selectivity filter. The Ca2+ is nearly fully hydrated with the first solvation shell intact during the whole permeation process. These results suggest a remote knock-on permeation mechanism and one-at-a-time occupation pattern for the hydrated Ca2+ within the narrow pore, uncovering the basis underlying the high permeability and low selectivity of the RyR channels.

Date: 2020
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DOI: 10.1038/s41467-020-14573-w

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