6fg3 is a 4 chain structure with sequence from Oryctolagus cuniculus. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
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Function
[RYR1_RABIT] Calcium channel that mediates the release of Ca(2+) from the sarcoplasmic reticulum into the cytoplasm and thereby plays a key role in triggering muscle contraction following depolarization of T-tubules. Repeated very high-level exercise increases the open probability of the channel and leads to Ca(2+) leaking into the cytoplasm. Can also mediate the release of Ca(2+) from intracellular stores in neurons, and may thereby promote prolonged Ca(2+) signaling in the brain. Required for normal embryonic development of muscle fibers and skeletal muscle. Required for normal heart morphogenesis, skin development and ossification during embryogenesis (By similarity).[1][2]
Publication Abstract from PubMed
Understanding gating principles of ion channels at high resolution is of great importance. Here we investigate the conformational transition from closed to open state in ryanodine receptor 1 (RyR1) reconstituted into lipid nanodiscs. RyR1 is a homotetrameric giant ion channel that couples excitation of muscle cells to fast calcium release from the sarcoplasmic reticulum. Using single-particle cryo-EM we show that RyR1 reconstituted into lipid nanodiscs is stabilized in the open conformation when bound to the plant toxin ryanodine, but not in the presence of its physiological activators, calcium and ATP. Further, using ryanodine binding assays we show that membrane mimetics influence RyR1 transition between closed and open-channel conformations. We find that all detergents, including fluorinated detergents added to nanodiscs, stabilize closed state of RyR1. Our biochemical results correlate with available structural data and suggest optimal conditions for structural studies of RyR1 gating.
Influence of Lipid Mimetics on Gating of Ryanodine Receptor.,Willegems K, Efremov RG Structure. 2018 Jul 12. pii: S0969-2126(18)30242-9. doi:, 10.1016/j.str.2018.06.010. PMID:30078641[3]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
↑Dulhunty AF, Laver DR, Gallant EM, Casarotto MG, Pace SM, Curtis S. Activation and inhibition of skeletal RyR channels by a part of the skeletal DHPR II-III loop: effects of DHPR Ser687 and FKBP12. Biophys J. 1999 Jul;77(1):189-203. PMID:10388749 doi:10.1016/S0006-3495(99)76881-5
↑Kakizawa S, Yamazawa T, Chen Y, Ito A, Murayama T, Oyamada H, Kurebayashi N, Sato O, Watanabe M, Mori N, Oguchi K, Sakurai T, Takeshima H, Saito N, Iino M. Nitric oxide-induced calcium release via ryanodine receptors regulates neuronal function. EMBO J. 2011 Oct 28;31(2):417-28. doi: 10.1038/emboj.2011.386. PMID:22036948 doi:10.1038/emboj.2011.386
↑Willegems K, Efremov RG. Influence of Lipid Mimetics on Gating of Ryanodine Receptor. Structure. 2018 Jul 12. pii: S0969-2126(18)30242-9. doi:, 10.1016/j.str.2018.06.010. PMID:30078641 doi:https://dx.doi.org/10.1016/j.str.2018.06.010
