Molecular Basis of Luminal Ca2+ Gating of the Cardiac Ryanodine Receptor

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Control of cardiac ryanodine receptor by sarcoplasmic reticulum luminal Ca2+

Introduction Cardiac myocyte contraction is driven by the coordinated release of Ca from the sarcoplasmic reticulum (SR). This release of Ca occurs through the cardiac RyR2. Physiologically, Ca release occurs in response to an influx of Ca through L-type Ca channels, via a mechanism termed CICR. This transient increase in cytosolic Ca activates the RyR2 channel as a result of Ca binding to the ...

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The synergic effect of luminal Ca(2+), cytosolic Ca(2+), and cytosolic adenosine triphosphate (ATP) on activation of cardiac ryanodine receptor (RYR2) channels was examined in planar lipid bilayers. The dose-response of RYR2 gating activity to ATP was characterized at a diastolic cytosolic Ca(2+) concentration of 100 nM over a range of luminal Ca(2+) concentrations and, vice versa, at a diastol...

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Ryanodine receptor luminal Ca2+ regulation: swapping calsequestrin and channel isoforms.

Sarcoplasmic reticulum (SR) Ca(2+) release in striated muscle is mediated by a multiprotein complex that includes the ryanodine receptor (RyR) Ca(2+) channel and the intra-SR Ca(2+) buffering protein calsequestrin (CSQ). Besides its buffering role, CSQ is thought to regulate RyR channel function. Here, CSQ-dependent luminal Ca(2+) regulation of skeletal (RyR1) and cardiac (RyR2) channels is exp...

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ژورنال

عنوان ژورنال: Biophysical Journal

سال: 2009

ISSN: 0006-3495

DOI: 10.1016/j.bpj.2008.12.2984