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Related Experiment Video

Updated: Jun 26, 2025

A Simple and Inexpensive Method for Determining Cold Sensitivity and Adaptation in Mice
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Physiological temperature drives TRPM4 ligand recognition and gating.

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Studying the TRPM4 ion channel at physiological temperatures reveals a distinct

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Area of Science:

  • Biophysics
  • Structural Biology
  • Ion Channel Physiology

Background:

  • Macromolecular function, especially protein activity, is significantly influenced by temperature.
  • Biophysical studies often neglect physiological temperatures, potentially yielding inaccurate biological insights.
  • Temperature-sensitive ion channels, like TRPM4, play crucial roles in physiological processes.

Purpose of the Study:

  • To investigate the temperature-dependent structural and functional characteristics of the TRPM4 ion channel.
  • To understand how TRPM4 functions and interacts with ligands at physiological temperatures.
  • To elucidate the gating mechanism of TRPM4 under physiologically relevant thermal conditions.

Main Methods:

  • Single-particle cryo-electron microscopy (cryo-EM) of TRPM4 at physiological temperatures.
  • Structural analysis to identify distinct conformations.
  • Functional assays to assess ligand binding and channel gating.

Main Results:

  • A novel 'warm' conformation of TRPM4 was identified at physiological temperatures, differing from low-temperature structures.
  • A temperature-dependent calcium-binding site in the intracellular domain was found to be crucial for TRPM4 function.
  • Ligand binding sites for decavanadate and ATP were shown to be temperature-dependent, with functional relevance.
  • The TRPM4 gating mechanism was elucidated, revealing channel opening at physiological temperatures, not observed previously.

Conclusions:

  • TRPM4 exhibits distinct structural and functional properties at physiological temperatures.
  • Studying macromolecules, particularly ion channels, at physiological temperatures is critical for accurate mechanistic and pharmacological understanding.
  • The findings provide a molecular framework for understanding thermosensitive TRPM channel temperature perception.