Structural basis for diamide modulation of ryanodine receptor.

(2020) Nat Chem Biol 16: 1246-1254

• PubMed: 32807966 Search on PubMedSearch on PubMed Central
• DOI: https://doi.org/10.1038/s41589-020-0627-5
• Primary Citation Related Structures: 
  6M2W, 7CF9


• PubMed Abstract: 
  

  The diamide insecticide class is one of the top-selling insecticides globally. They are used to control a wide range of pests by targeting their ryanodine receptors (RyRs). Here, we report the highest-resolution cryo-electron microscopy (cryo-EM) structure of RyR1 in the open state, in complex with the anthranilic diamide chlorantraniliprole (CHL). The 3.2-Å local resolution map facilitates unambiguous assignment of the CHL binding site. The molecule induces a conformational change by affecting the S4-S5 linker, triggering channel opening. The binding site is further corroborated by mutagenesis data, which reveal how diamide insecticides are selective to the Lepidoptera group of insects over honeybee or mammalian RyRs. Our data reveal that several pests have developed resistance via two mechanisms, steric hindrance and loss of contact. Our results provide a foundation for the development of highly selective pesticides aimed at overcoming resistance and therapeutic molecules to treat human myopathies.

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Organizational Affiliation: 
• Tianjin Key Laboratory for Modern Drug Delivery & High-Efficiency, Collaborative Innovation Center of Chemical Science and Engineering, School of Pharmaceutical Science and Technology, Tianjin University, Tianjin, China.
Department of Biochemistry and Molecular Biology, Life Sciences Institute, University of British Columbia, Vancouver, British Columbia, Canada.
Laboratory of Organic Chemistry, Wageningen University & Research, Wageningen, the Netherlands.
State Key Laboratory of Elemento-organic Chemistry, Nankai University, Tianjin, China.
Key Laboratory of Drug Targets and Drug Leads for Degenerative Diseases, Affiliated Hospital of Integrated Traditional Chinese and Western Medicine, Nanjing University of Chinese Medicine, Nanjing, China.
State Key Laboratory of Medicinal Chemical Biology, College of Life Sciences, Nankai University, Tianjin, China.
Department of Cellular and Molecular Pharmacology, Juntendo University Graduate School of Medicine, Tokyo, Japan.
Interfaculty Institute of Cell Biology, University of Tübingen, Tübingen, Germany.
Department of Biochemistry and Molecular Biology, Life Sciences Institute, University of British Columbia, Vancouver, British Columbia, Canada. filip.vanpetegem@gmail.com.
Tianjin Key Laboratory for Modern Drug Delivery & High-Efficiency, Collaborative Innovation Center of Chemical Science and Engineering, School of Pharmaceutical Science and Technology, Tianjin University, Tianjin, China. yuchi@tju.edu.cn.
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