Structures of the calcium-activated, non-selective cation channel TRPM4

Jiangtao Guo, Ji She, Weizhong Zeng, Qingfeng Chen, Xiao-chen Bai () and Youxing Jiang ()
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Jiangtao Guo: University of Texas Southwestern Medical Center
Ji She: University of Texas Southwestern Medical Center
Weizhong Zeng: University of Texas Southwestern Medical Center
Qingfeng Chen: University of Texas Southwestern Medical Center
Xiao-chen Bai: University of Texas Southwestern Medical Center
Youxing Jiang: University of Texas Southwestern Medical Center

Nature, 2017, vol. 552, issue 7684, 205-209

Abstract: Abstract TRPM4 is a calcium-activated, phosphatidylinositol-4,5-bisphosphate (PtdIns(4,5)P2) -modulated, non-selective cation channel that belongs to the family of melastatin-related transient receptor potential (TRPM) channels. Here we present the electron cryo-microscopy structures of the mouse TRPM4 channel with and without ATP. TRPM4 consists of multiple transmembrane and cytosolic domains, which assemble into a three-tiered architecture. The N-terminal nucleotide-binding domain and the C-terminal coiled-coil participate in the tetrameric assembly of the channel; ATP binds at the nucleotide-binding domain and inhibits channel activity. TRPM4 has an exceptionally wide filter but is only permeable to monovalent cations; filter residue Gln973 is essential in defining monovalent selectivity. The S1–S4 domain and the post-S6 TRP domain form the central gating apparatus that probably houses the Ca2+- and PtdIns(4,5)P2-binding sites. These structures provide an essential starting point for elucidating the complex gating mechanisms of TRPM4 and reveal the molecular architecture of the TRPM family.

Date: 2017
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DOI: 10.1038/nature24997

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