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Proc Natl Acad Sci U S A. 2006 Dec 19;103(51):19564-8. Epub 2006 Dec 12.

TRP channel activation by reversible covalent modification.

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1
Department of Physiology, University of California, San Francisco, CA 94158, USA.

Abstract

Allyl isothiocyanate, the pungent principle of wasabi and other mustard oils, produces pain by activating TRPA1, an excitatory ion channel on sensory nerve endings. Isothiocyanates are membrane-permeable electrophiles that form adducts with thiols and primary amines, suggesting that covalent modification, rather than classical lock-and-key binding, accounts for their agonist properties. Indeed, we show that thiol reactive compounds of diverse structure activate TRPA1 in a manner that relies on covalent modification of cysteine residues within the cytoplasmic N terminus of the channel. These findings suggest an unusual paradigm whereby natural products activate a receptor through direct, reversible, and covalent protein modification.

PMID:
17164327
PMCID:
PMC1748265
DOI:
10.1073/pnas.0609598103
[Indexed for MEDLINE]
Free PMC Article
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