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Updated: Jul 27, 2025
12:09
Yeast Luminometric and Xenopus Oocyte Electrophysiological Examinations of the Molecular Mechanosensitivity of TRPV4
Published on: December 31, 2013
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Structural basis of TRPV1 modulation by endogenous bioactive lipids.
Biorxiv : the Preprint Server for Biology
|June 9, 2023
Summary
Phosphoinositide lipids negatively regulate the TRPV1 channel by binding to a transmembrane pocket. Ejection of these lipids activates TRPV1, crucial for understanding inflammatory pain.
Area of Science:
- Molecular biology
- Structural biology
- Neuroscience
Background:
- Transient Receptor Potential (TRP) ion channels are modulated by phosphoinositide lipids, but the structural basis is unclear.
- The capsaicin and heat receptor, TRPV1, is a model for lipid modulation, relevant to inflammatory pain.
- A pocket in the TRPV1 transmembrane core was identified for phosphoinositide lipid binding.
Approach:
- Investigated lipid binding modes within the TRPV1 regulatory pocket.
- Examined the effect of diverse lipid species, including lysophosphatidic acid (LPA).
- Assessed channel activity in an 'empty pocket' mutant lacking endogenous phosphoinositides.
Key Points:
- The TRPV1 regulatory pocket accommodates various phosphoinositide lipids, including LPA.
- Specific lipid binding modes dictate their regulatory effects on TRPV1.
- An 'empty pocket' TRPV1 mutant exhibits agonist-like activity, even at low temperatures.
Conclusions:
- Phosphoinositide lipids act as negative modulators of TRPV1 channel activity.
- Lipid ejection from the binding pocket is essential for TRPV1 activation by stimuli.
- This mechanism is critical for understanding inflammatory pain and pro-algesic agent action.
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