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Updated: Jul 3, 2026

Crystal Structure of the N-terminal Domain of Ryanodine Receptor from Plutella xylostella
Published on: November 30, 2018
Structural and functional characterization of ryanodine receptor-natrin toxin interaction
Qiang Zhou1, Qiong-Ling Wang, Xing Meng
1Department of Biological Sciences and Biotechnology, State-Key Laboratory of Biomembrane and Membrane Biotechnology, Tsinghua University, Beijing 100084, China.
Natrin, a snake venom protein, inhibits calcium release channels by binding to specific domains. This research clarifies how cysteine-rich secretory proteins interact with ion channels.
Area of Science:
- Biochemistry
- Molecular Biology
- Toxicology
Background:
- Cysteine-rich secretory proteins (CRISPs) are found in various tissues and venoms.
- Many CRISPs modulate ion channel activity, including potassium and calcium channels.
Purpose of the Study:
- To elucidate the inhibitory mechanism of natrin, a CRISP from snake venom, on the ryanodine receptor (RyR).
- To determine the structural basis of natrin's interaction with RyR1.
Main Methods:
- Purification of natrin from snake venom.
- Immunoprecipitation to identify natrin's binding target.
- Cryo-electron microscopy and single-particle image reconstruction.
- Structural docking of natrin into the RyR1 complex.
Main Results:
- Natrin specifically binds to type 1 RyR (RyR1) from skeletal muscle.
- Natrin inhibits both ryanodine binding and calcium channel activity of RyR1.
- Cryo-EM revealed natrin binds to RyR1's clamp domains, stabilizing interactions.
Conclusions:
- Natrin inhibits RyR1 by stabilizing domain-domain interactions via its cysteine-rich domain.
- This study provides insights into natrin's mechanism of action on calcium release channels.
- A generalized model for CRISP-ion channel interactions is proposed.
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