High-throughput random mutagenesis screen reveals TRPM8 residues specifically required for activation by menthol

Michael Bandell, Adrienne E. Dubin, Matt J. Petrus, Anthony Orth, Jayanti Mathur, Wook Hwang Sun, Ardem Patapoutian

Research output: Contribution to journalArticlepeer-review

213 Citations (Scopus)

Abstract

Menthol is a cooling compound derived from mint leaves and is extensively used as a flavoring chemical. Menthol activates transient receptor potential melastatin 8 (TRPM8), an ion channel also activated by cold, voltage and phosphatidylinositol-4,5-bisphosphate (PIP2). Here we investigated the mechanism by which menthol activates mouse TRPM8. Using a new high-throughput approach, we screened a random mutant library consisting of ∼14,000 individual TRPM8 mutants for clones that are affected in their response to menthol while retaining channel function. We identified determinants of menthol sensitivity in two regions: putative transmembrane segment 2 (S2) and the C-terminal TRP domain. Analysis of these mutants indicated that activation by menthol involves a gating mechanism distinct and separable from gating by cold, voltage or PIP2. Notably, TRP domain mutations mainly attenuated menthol efficacy, suggesting that this domain influences events downstream of initial binding. In contrast, S2 mutations strongly shifted the concentration dependence of menthol activation, raising the possibility that S2 influences menthol binding.

Original languageEnglish
Pages (from-to)493-500
Number of pages8
JournalNature Neuroscience
Volume9
Issue number4
DOIs
Publication statusPublished - 2006 Apr

Bibliographical note

Funding Information:
We thank N. Gray, L. Miraglia, J. Zhang, M. Medina, A. Saghatelian, B. Cravatt, T. Jegla, V. Lee and S. Peters for valuable contributions and input. This work was supported by NINDS grant NS046303. M.B. is supported by a postdoctoral fellowship from the American Heart Association. A.P. is Damon Runyon Fellow and a member of the H. Dorris Neurological Research Institute.

ASJC Scopus subject areas

  • General Neuroscience

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