Download MendeleyStructural landscape of activation, desensitization and inhibition in the human TRPM4 channel.
Teixeira-Duarte, C.M., Zeng, W., Jiang, Y.(2025) Nat Struct Mol Biol
- PubMed: 41174278
- DOI: https://doi.org/10.1038/s41594-025-01705-3
- Primary Citation of Related Structures:
9MRT, 9MT8, 9MTA, 9MTC - PubMed Abstract:
TRPM4 is a member of the transient receptor potential melastatin channel subfamily and functions as a Ca 2+ -activated monovalent-selective cation channel. It is widely expressed in various cells and tissues, where its activation depolarizes the plasma membrane potential and modulates various Ca 2+ -dependent biological processes. TRPM4 activity is potentiated by membrane phosphatidylinositol 4,5-bisphosphate (PtdIns(4,5)P 2 ) and inhibited by cytosolic free adenosine triphosphate (ATP), allowing the channel to transition between different functional states in response to dynamic changes in cellular Ca 2+ , ATP and PtdIns(4,5)P 2 levels during signaling events. Here we present single-particle cryo-electron microscopy structures of human TRPM4 in four distinct states: apo closed, Ca 2+ -bound putative desensitized, Ca 2+ -PtdIns(4,5)P 2 -bound open and ATP-bound inhibited. Combined with mutagenesis and electrophysiological analyses, these structures reveal the molecular mechanisms underlying TRPM4 activation, desensitization and inhibition. Given the central roles of Ca 2+ , PtdIns(4,5)P 2 and ATP in cellular signaling, this work provides a structural foundation to decipher the physiological functions of TRPM4 across diverse biological systems.
- Howard Hughes Medical Institute and Department of Physiology, University of Texas Southwestern Medical Center, Dallas, TX, USA.
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