Why the study?
It remains unclear whether coupled gating between ryanodine receptors reflects contact-dependent allosteric interactions and occurs in vivo with sufficient prevalence to be relevant to physiology and pathophysiology.
The physiological role of allosteric coupling between ryanodine receptors in cardiac and skeletal muscle remains unproven, highlighting the need for further research.
RyR gating observations in bilayers warrant no clinical change; leaves open whether allosteric coupling occurs in vivo.
This study reveals an examination of the phenomenon of coupled gating between ryanodine receptors, the Ca2+ channels of the sarcoplasmic reticulum of skeletal and cardiac muscle, essential for the execution of contraction upon electrical excitation. It asks whether the phenomenon-pairs of channels or larger groups, reconstituted in bilayers, opening and closing together-reflects allosteric interactions that require contact between channels, and whether the phenomenon occurs in vivo with sufficient prevalence to be relevant to physiology and pathophysiology. The examination covers definitions, observations of coupled currents, structural studies of channels, in purified or in native membranes, and quantitative modeling of the phenomena. It concludes with a negative answer to the question whether a physiological role is proven, but a hopeful perspective on further research.
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Eduardo Rı́os (2025) studied this question.
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