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A Modular PIP2 Binding Site as a Determinant of Capsaicin Receptor Sensitivity
Elizabeth D. Prescott, and
David Julius*
Abstract:
The capsaicin receptor (TRPV1), a heat-activated ion channelof the pain pathway, is sensitized by phosphatidylinositol-4,5-bisphosphate(PIP2) hydrolysis after phospholipase C activation. We identifya site within the C-terminal domain of TRPV1 that is requiredfor PIP2-mediated inhibition of channel gating. Mutations thatweaken PIP2-TRPV1 interaction reduce thresholds for chemicalor thermal stimuli, whereas TRPV1 channels in which this regionis replaced with a lipid-binding domain from PIP2-activatedpotassium channels remain inhibited by PIP2. The PIP2-interactiondomain therefore serves as a critical determinant of thermalthreshold and dynamic sensitivity range, tuning TRPV1, and thusthe sensory neuron, to appropriately detect heat under normalor pathophysiological conditions.
Department of Cellular and Molecular Pharmacology, University of California, San Francisco, CA 941432140, USA.
* To whom correspondence should be addressed. E-mail: julius{at}cmp.ucsf.edu
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