The role of the N terminus and transmembrane domain of TRPM8 in channel localization and tetramerization

The Journal of Biological Chemistry
Christopher B Phelps, Rachelle Gaudet

Abstract

Transient receptor potential (TRP) channels are a family of cation channels involved in diverse cellular functions. They are composed of a transmembrane domain of six putative transmembrane segments flanked by large N- and C-terminal cytoplasmic domains. The melastatin subfamily (TRPM) channels have N-terminal domains of approximately 700 amino acids with four regions of shared homology and C-terminal domains containing the conserved TRP domain followed by a coiled-coil region. Here we investigated the effects of N- and C-terminal deletions on the cold and menthol receptor, TRPM8, expressed heterologously in Sf21 insect cells. Patch-clamp electrophysiology was used to study channel activity and revealed that only deletion of the first 39 amino acids was tolerated by the channel. Further N-terminal truncation or any C-terminal deletions prevented proper TRPM8 function. Confocal microscopy with immunofluorescence revealed that amino acids 40-86 are required for localization to the plasma membrane. Furthermore, analysis of deletion mutant oligomerization shows that the transmembrane domain is sufficient for TPRM8 assembly into tetramers. TRPM8 channels with C-terminal deletions tetramerize and localize properly but are inactive, i...Continue Reading

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