Sequence and structural conservation reveal fingerprint residues in TRP channels

Area of Science:

• Molecular biology
• Structural biology
• Biophysics

Background:

• Transient receptor potential (TRP) channels are crucial cation-selective channels involved in various physiological processes.
• The precise molecular mechanisms underlying TRP channel gating (e.g., by voltage, ligands, or temperature) remain incompletely understood.
• Understanding the structural basis of TRP channel function is essential for deciphering their diverse roles.

Purpose of the Study:

• To identify conserved structural features within the transmembrane domains of TRP channels.
• To elucidate common structural elements that may underlie the functional diversity of TRP channel subtypes.
• To investigate potential structural determinants of TRP channel gating mechanisms.

Main Methods:

• Phylogenetic reconstruction of TRP channel genes.
• Sequence statistical analysis of TRP channel protein families.
• Structural analysis of conserved residues across different TRP subtypes.

Main Results:

• An exceptionally conserved set of twelve residues was identified across diverse TRP channel subtypes.
• These conserved residues occupy equivalent three-dimensional positions within the transmembrane domains.
• The residues form three distinct groups connected by aromatic amino acids at the transmembrane core.

Conclusions:

• The identified conserved residue fingerprint likely plays a fundamental role in TRP channel structure and function.
• Variations in the connectivity between these residue groups may explain the distinct gating strategies observed in different TRP channel subgroups.
• This finding provides a structural framework for understanding TRP channel diversity and regulation.