Download MendeleyStructural insights into transmembrane helix S0 facilitated RyR1 channel gating by Ca 2+ /ATP.
Wei, R., Chen, Q., Zhang, L., Liu, C., Liu, C., Yin, C.C., Hu, H.(2025) Nat Commun 16: 1936-1936
- PubMed: 39994184
- DOI: https://doi.org/10.1038/s41467-025-57074-4
- Primary Citation of Related Structures:
8X48, 8X49, 8X4A, 8X4B, 8X4C, 8X4D, 8X4E - PubMed Abstract:
The type-1 ryanodine receptor (RyR1) is an intracellular calcium release channel for skeletal muscle excitation-contraction coupling. Previous structural studies showed that the RyR1 activity is modulated by the exogenous regulators including caffeine, ryanodine, PCB-95 and diamide. An additional transmembrane helix, located adjacent to S1 and S4, has been observed in some structures, although its function remains unclear. Here, we report that using a mild purification procedure, this helix is co-purified with RyR1 and is designated as S0. When RyR1 is coupled with S0, it can be activated by Ca 2+ to an open state; however when decoupled from S0, it remains in primed state. S0 regulates the channel conformation by directly affecting the TM domain via the pVSD-S0-S4/S5 linker coupling, which facilitates the dilation of S6. Our results demonstrate that S0 is an essential component of RyR1 and plays a key role in the physiological regulation of RyR1 channel gating.
Organizational Affiliation:
Department of Biophysics, School of Basic Medical Sciences, Peking University, Beijing, 100191, China.
