Structural basis for the gating mechanism of the type 2 ryanodine receptor RyR2.

TitleStructural basis for the gating mechanism of the type 2 ryanodine receptor RyR2.
Publication TypeJournal Article
Year of Publication2016
AuthorsPeng, W, Shen, H, Wu, J, Guo, W, Pan, X, Wang, R, Chen, SRWayne, Yan, N
Date Published2016 Oct 21
KeywordsAnimals, Calcium, Cryoelectron Microscopy, Cytoplasm, Heart, Ion Channel Gating, Mutation, Protein Domains, Ryanodine Receptor Calcium Release Channel, Swine

<p>RyR2 is a high-conductance intracellular calcium (Ca) channel that controls the release of Ca from the sarco(endo)plasmic reticulum of a variety of cells. Here, we report the structures of RyR2 from porcine heart in both the open and closed states at near-atomic resolutions determined using single-particle electron cryomicroscopy. Structural comparison reveals a breathing motion of the overall cytoplasmic region resulted from the interdomain movements of amino-terminal domains (NTDs), Helical domains, and Handle domains, whereas almost no intradomain shifts are observed in these armadillo repeats-containing domains. Outward rotations of the Central domains, which integrate the conformational changes of the cytoplasmic region, lead to the dilation of the cytoplasmic gate through coupled motions. Our structural and mutational characterizations provide important insights into the gating and disease mechanism of RyRs.</p>

Alternate JournalScience
PubMed ID27708056