TRPM8型
瞬时受体电位通道
化学
配体(生物化学)
生物物理学
磷脂酰肌醇
生物化学
受体
信号转导
生物
TRPV1型
作者
Cheng Zhao,Yuan Xie,Lizhen Xu,Fan Ye,Ximing Xu,Wei Yang,Fan Yang,Jiangtao Guo
标识
DOI:10.1038/s41467-022-30919-y
摘要
Transient receptor potential melastatin 8 (TRPM8) channel is a Ca2+-permeable non-selective cation channel that acts as the primary cold sensor in humans. TRPM8 is also activated by ligands such as menthol, icilin, and phosphatidylinositol 4,5-bisphosphate (PIP2), and desensitized by Ca2+. Here we have determined electron cryo-microscopy structures of mouse TRPM8 in the absence of ligand, and in the presence of Ca2+ and icilin at 2.5-3.2 Å resolution. The ligand-free state TRPM8 structure represents the full-length structure of mammalian TRPM8 channels with a canonical S4-S5 linker and the clearly resolved selectivity filter and outer pore loop. TRPM8 has a short but wide selectivity filter which may account for its permeability to hydrated Ca2+. Ca2+ and icilin bind in the cytosolic-facing cavity of the voltage-sensing-like domain of TRPM8 but induce little conformational change. All the ligand-bound TRPM8 structures adopt the same closed conformation as the ligand-free structure. This study reveals the overall architecture of mouse TRPM8 and the structural basis for its ligand recognition.
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