Postulated role of inter-domain interaction within the ryanodine receptor in Ca(2+) channel regulation

Trends in Cardiovascular Medicine
Noriaki Ikemoto, T Yamamoto

Abstract

Key steps of excitation-contraction (E-C) coupling are (1) binding of the activator portion of the dihydropyridine (DHP) receptor (in skeletal muscle) or binding of the Ca(2+) entered through the DHP receptor (in cardiac muscle) to the ryanodine receptor (RyR), (2) a global protein conformational change of the RyR, and (3) opening of the RyR Ca(2+) channel, leading to muscle contraction. The conformational change (step 2) plays a major role in the Ca(2+) channel regulation, and a number of "regulatory domains" must be involved in this process. We postulate that the interaction among these regulatory domains is the central mechanism for the conformation-mediated control of the Ca(2+) channel. In this review, we summarize the recent data supporting this concept.

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