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Pathological conformations of disease mutant Ryanodine Receptors revealed by cryo-EM

Author

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  • Kellie A. Woll

    (University of British Columbia, Department of Biochemistry and Molecular Biology, Life Sciences Centre)

  • Omid Haji-Ghassemi

    (University of British Columbia, Department of Biochemistry and Molecular Biology, Life Sciences Centre)

  • Filip Van Petegem

    (University of British Columbia, Department of Biochemistry and Molecular Biology, Life Sciences Centre)

Abstract

Ryanodine Receptors (RyRs) are massive channels that release Ca2+ from the endoplasmic and sarcoplasmic reticulum. Hundreds of mutations are linked to malignant hyperthermia (MH), myopathies, and arrhythmias. Here, we explore the first MH mutation identified in humans by providing cryo-EM snapshots of the pig homolog, R615C, showing that it affects an interface between three solenoid regions. We also show the impact of apo-calmodulin (apoCaM) and how it can induce opening by bending of the bridging solenoid, mediated by its N-terminal lobe. For R615C RyR1, apoCaM binding abolishes a pathological ‘intermediate’ conformation, distributing the population to a mixture of open and closed channels, both different from the structure without apoCaM. Comparisons show that the mutation primarily affects the closed state, inducing partial movements linked to channel activation. This shows that disease mutations can cause distinct pathological conformations of the RyR and facilitate channel opening by disrupting interactions between different solenoid regions.

Suggested Citation

  • Kellie A. Woll & Omid Haji-Ghassemi & Filip Van Petegem, 2021. "Pathological conformations of disease mutant Ryanodine Receptors revealed by cryo-EM," Nature Communications, Nature, vol. 12(1), pages 1-13, December.
    • Handle: RePEc:nat:natcom:v:12:y:2021:i:1:d:10.1038_s41467-021-21141-3
    DOI: 10.1038/s41467-021-21141-3
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    Cited by:

    1. Michael J. Maxwell & Chris Thekkedam & Cedric Lamboley & Yanni K.-Y. Chin & Theo Crawford & Jennifer J. Smith & Junyu Liu & Xinying Jia & Irina Vetter & Derek R. Laver & Bradley S. Launikonis & Angela, 2023. "A bivalent remipede toxin promotes calcium release via ryanodine receptor activation," Nature Communications, Nature, vol. 14(1), pages 1-13, December.
    2. Marco C. Miotto & Steven Reiken & Anetta Wronska & Qi Yuan & Haikel Dridi & Yang Liu & Gunnar Weninger & Carl Tchagou & Andrew R. Marks, 2024. "Structural basis for ryanodine receptor type 2 leak in heart failure and arrhythmogenic disorders," Nature Communications, Nature, vol. 15(1), pages 1-15, December.
    3. Robyn T. Rebbeck & Bengt Svensson & Jingyan Zhang & Montserrat Samsó & David D. Thomas & Donald M. Bers & Razvan L. Cornea, 2024. "Kinetics and mapping of Ca-driven calmodulin conformations on skeletal and cardiac muscle ryanodine receptors," Nature Communications, Nature, vol. 15(1), pages 1-13, December.
    4. Takuya Kobayashi & Akihisa Tsutsumi & Nagomi Kurebayashi & Kei Saito & Masami Kodama & Takashi Sakurai & Masahide Kikkawa & Takashi Murayama & Haruo Ogawa, 2022. "Molecular basis for gating of cardiac ryanodine receptor explains the mechanisms for gain- and loss-of function mutations," Nature Communications, Nature, vol. 13(1), pages 1-15, December.

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