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• W2034220566 startingPage "e1000367" @default.
• W2034220566 abstract "Ryanodine receptors (RyRs) are ion channels that regulate muscle contraction by releasing calcium ions from intracellular stores into the cytoplasm. Mutations in skeletal muscle RyR (RyR1) give rise to congenital diseases such as central core disease. The absence of high-resolution structures of RyR1 has limited our understanding of channel function and disease mechanisms at the molecular level. Here, we report a structural model of the pore-forming region of RyR1. Molecular dynamics simulations show high ion binding to putative pore residues D4899, E4900, D4938, and D4945, which are experimentally known to be critical for channel conductance and selectivity. We also observe preferential localization of Ca(2+) over K(+) in the selectivity filter of RyR1. Simulations of RyR1-D4899Q mutant show a loss of preference to Ca(2+) in the selectivity filter as seen experimentally. Electrophysiological experiments on a central core disease mutant, RyR1-G4898R, show constitutively open channels that conduct K(+) but not Ca(2+). Our simulations with G4898R likewise show a decrease in the preference of Ca(2+) over K(+) in the selectivity filter. Together, the computational and experimental results shed light on ion conductance and selectivity of RyR1 at an atomistic level." @default.
• W2034220566 created "2016-06-24" @default.
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• W2034220566 date "2009-04-24" @default.
• W2034220566 modified "2023-10-14" @default.
• W2034220566 title "A Structural Model of the Pore-Forming Region of the Skeletal Muscle Ryanodine Receptor (RyR1)" @default.
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• W2034220566 doi "https://doi.org/10.1371/journal.pcbi.1000367" @default.
• W2034220566 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/2668181" @default.
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• W2034220566 hasPublicationYear "2009" @default.
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