Channelpedia

PubMed 21878524


Referenced in Channelpedia wiki pages of: none

Automatically associated channels: TRP , TRPM , TRPM8



Title: Ligand stoichiometry of the cold- and menthol-activated channel TRPM8.

Authors: Annelies Janssens, Thomas Voets

Journal, date & volume: J. Physiol. (Lond.), 2011 Oct 15 , 589, 4827-35

PubMed link: http://www.ncbi.nlm.nih.gov/pubmed/21878524


Abstract
Temperature-sensitive transient receptor potential (TRP) channels play a key role in somatosensation, not only as primary thermosensors but also as chemosensors for various compounds that evoke a thermal sensation. The fundamental mechanisms whereby TRP channels translate ligand binding into opening of the ion conducting pore are, however, poorly understood, and the actual number of ligands that bind to these channels is fully unknown. Here, we investigated the ligand stoichiometry of the cold sensor and menthol receptor TRPM8. Based on a detailed biophysical analysis of tandem constructs of wild-type and menthol-insensitive TRPM8 subunits, we now provide direct evidence that each channel has four independent and energetically equivalent menthol interaction sites. These results suggest a fundamentally different ligand stoichiometry in TRP channels, in comparison with other major families of ligand-gated ion channels.