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Functional Characterization of Endogenously Expressed Human RYR1 Variants
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How mutations in RYR1 that cause malignant hyperthermia increase RYR1 sensitivity to activators.

Matthew L Baker1, Robert T Dirksen2, Susan L Hamilton3

  • 1Department of Biochemistry and Molecular Biology, University of Texas Health Science Center, Houston, TX, 77030, United States.

Cell Calcium
|April 27, 2021
PubMed
Summary

Malignant Hyperthermia mutations alter the RYR1 channel structure. These changes in the closed channel’s cytoplasmic domains mimic those of the open state, providing new insights into the disease mechanism.

Keywords:
Electron cryomicroscopyMalignant hyperthermiaRYR1

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Area of Science:

  • Biophysics
  • Molecular Biology
  • Structural Biology

Background:

  • The ryanodine receptor type 1 (RYR1) is a critical calcium channel involved in muscle contraction.
  • Malignant Hyperthermia (MH) is a severe pharmacogenetic disorder triggered by RYR1 mutations.
  • Understanding the structural basis of RYR1 dysfunction in MH is crucial for developing therapeutic strategies.

Purpose of the Study:

  • To elucidate the structural consequences of Malignant Hyperthermia-associated mutations in the RYR1 channel.
  • To investigate how these mutations affect the conformational dynamics between the closed and open states of the RYR1 channel.

Main Methods:

  • High-resolution cryo-electron microscopy (cryo-EM) was employed to determine the structures of RYR1.
  • Comparative structural analysis was performed on wild-type and mutant RYR1 channels.

Main Results:

  • Novel cryo-EM structures revealed distinct conformational states of the RYR1 channel.
  • Mutations associated with Malignant Hyperthermia induced significant conformational changes in the cytoplasmic domains of the closed RYR1 channel.
  • These altered conformations closely resembled the structural features of the open RYR1 channel state.

Conclusions:

  • Malignant Hyperthermia mutations destabilize the closed state of RYR1, favoring conformations similar to the open state.
  • These findings provide a structural mechanism for the hyper-excitation of muscle calcium release in MH.
  • The study offers a foundation for targeted therapeutic interventions aimed at stabilizing the RYR1 channel.