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Structural basis of TRPV1 modulation by endogenous bioactive lipids.

William R Arnold1, Adamo Mancino1,2, Frank R Moss1,3

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Phosphoinositide lipids negatively regulate the TRPV1 channel by binding to a specific pocket. Ejection of these lipids activates the channel, crucial for understanding inflammatory pain.

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Area of Science:

  • Molecular biology
  • Neuroscience
  • Biophysics

Background:

  • Transient Receptor Potential (TRP) ion channels, including TRPV1, are modulated by phosphoinositide lipids.
  • The structural basis for lipid modulation of TRP channels, particularly TRPV1, is not fully understood.
  • Understanding TRPV1 lipid modulation is key to deciphering inflammatory pain mechanisms.

Purpose of the Study:

  • To elucidate the structural mechanisms of phosphoinositide lipid modulation of the TRPV1 channel.
  • To investigate how diverse lipid species bind to and regulate TRPV1 activity.
  • To determine the role of phosphoinositide lipids as negative modulators of TRPV1.

Main Methods:

  • Utilized rat TRPV1 as a model system.
  • Investigated lipid binding within the TRPV1 transmembrane core.
  • Analyzed the functional consequences of lipid binding and ejection on channel activity.

Main Results:

  • Identified a regulatory pocket in the TRPV1 transmembrane core capable of accommodating various phosphoinositide lipids, including lysophosphatidic acid.
  • Demonstrated that different lipid species bind via distinct modes, influencing channel activity.
  • Showed that TRPV1 channels lacking endogenous phosphoinositide lipids adopt an agonist-like, active state even at low temperatures.

Conclusions:

  • Phosphoinositide lipids act as negative modulators of TRPV1 channel activity.
  • Lipid ejection from the regulatory pocket is a critical step for TRPV1 activation by thermal and chemical stimuli.
  • This finding provides a structural mechanism for TRPV1 regulation relevant to inflammatory pain.