Structure-Function Relationship of TRPM2: Recent Advances, Contradictions, and Open Questions

Area of Science:

• Structural biology
• Ion channel physiology
• Biophysics

Background:

• The transient receptor potential melastatin type 2 (TRPM2) cation channel plays a crucial role in cellular functions, but its gating mechanism remains incompletely understood.
• Traditional methods have provided limited insights into TRPM2 channel function, necessitating advanced techniques.

Purpose of the Study:

• To provide a comprehensive overview of TRPM2 ortholog functional data, integrating it with recent cryogenic electron microscopy (cryo-EM) structural studies.
• To identify and discuss functional contradictions arising from the structural data of TRPM2.
• To outline open questions and suggest future experimental approaches for TRPM2 research.

Main Methods:

• Review of existing literature on TRPM2 function and structure.
• Analysis of cryogenic electron microscopy (cryo-EM) structural data for TRPM2.
• Integration of functional data with structural insights.

Main Results:

• Cryo-EM structure analysis has provided unprecedented insights into the gating mechanism of TRPM2 channels.
• Structural data explains previously observed functional data for several TRPM2 orthologs.
• Discrepancies between structural and functional data for TRPM2 were identified, suggesting areas for further investigation.

Conclusions:

• The integration of structural and functional data is crucial for advancing the understanding of TRPM2 channel gating.
• Future research should focus on resolving contradictions and exploring novel experimental approaches to elucidate TRPM2 function.
• New methodologies, like cryo-EM, are transformative for studying complex ion channels such as TRPM2.