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J Mol Biol. 2005 Jun 10;349(3):538-46. Epub 2005 Apr 25.

Physical coupling between ryanodine receptor-calcium release channels.

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Department of Biophysics, Peking University Health Science Center, Peking University, 38 Xueyuan Road, Beijing 100083, China.


Ryanodine receptor-calcium release channels play a pivotal role in the calcium signaling that mediates muscle excitation-contraction coupling. Their membrane organization into regular patterns, functional gating studies and theoretical analysis of receptor clustering have led to models that invoke allosteric interaction between individual channel oligomers as a critical mechanism for control of calcium release. Here we show that in reconstituted "checkerboard-like" lattices that mimic in situ membrane channel arrays, each oligomer is interlocked physically with four adjacent oligomers via a specific domain-domain interaction. Direct physical coupling between ryanodine receptors provides structural evidence for an inter-oligomer allosteric mechanism in channel regulation. Therefore, in addition to established cytosolic and luminal regulation of function, these observations indicate that channel-channel communication through physical coupling provides a novel mode of regulation of intracellular calcium release channels.

[Indexed for MEDLINE]

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