Serysheva, I.I. and Baker, M.L. and Cong, Y. and Topf, Maya and Eramian, D. and Sali, A. and Hamilton, S.L. and Chiu, W. (2008) Subnanometer-resolution electron cryomicroscopy-based domain models for the cytoplasmic region of skeletal muscle RyR channel. Proceedings of the National Academy of Sciences of the United States of America 105 (28), pp. 9610-9615. ISSN 0027-8424.Full text not available from this repository.
The skeletal muscle Ca2+ release channel (RyR1), a homotetramer, regulates the release of Ca2+ from the sarcoplasmic reticulum to initiate muscle contraction. In this work, we have delineated the RyR1 monomer boundaries in a subnanometer-resolution electron cryomicroscopy (cryo-EM) density map. In the cytoplasmic region of each RyR1 monomer, 36 α-helices and 7 β-sheets can be resolved. A β-sheet was also identified close to the membrane-spanning region that resembles the cytoplasmic pore structures of inward rectifier K+ channels. Three structural folds, generated for amino acids 12–565 using comparative modeling and cryo-EM density fitting, localize close to regions implicated in communication with the voltage sensor in the transverse tubules. Eleven of the 15 disease-related residues for these domains are mapped to the surface of these models. Four disease-related residues are found in a basin at the interfaces of these regions, creating a pocket in which the immunophilin FKBP12 can fit. Taken together, these results provide a structural context for both channel gating and the consequences of certain malignant hyperthermia and central core disease-associated mutations in RyR1.
|School or Research Centre:||Birkbeck Schools and Research Centres > School of Science > Biological Sciences|
|Date Deposited:||04 Aug 2010 14:09|
|Last Modified:||17 Apr 2013 12:17|
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