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The HECT ubiquitin ligase AIP4 regulates the cell surface expression of select TRP channels

Tomasz Wegierski1, Kerstin Hill, Michael Schaefer

  • 1Renal Division, University Hospital Freiburg, Hugstetter Strasse 55, Freiburg 79106, Germany.

The EMBO Journal
|November 18, 2006
PubMed

Insights

Ubiquitination by AIP4 controls TRPV4 channel presence at the cell membrane, reducing its activity without degradation. This mechanism also affects TRPC4, highlighting a specific regulation for select TRP channels.

Area of Science:

  • Molecular biology
  • Cell physiology
  • Ion channel regulation

Background:

  • Transient Receptor Potential Vanilloid 4 (TRPV4) channels facilitate calcium entry into nonexcitable cells.
  • Mechanisms for terminating TRPV4 channel activity are not well understood.

Purpose of the Study:

  • To investigate the role of ubiquitination in regulating TRPV4 channel activity and localization.
  • To determine if AIP4 influences TRPV4 channel presence at the plasma membrane.

Main Methods:

  • Studied the effect of the HECT-family ubiquitin ligase AIP4 on TRPV4 ubiquitination and localization.
  • Assessed changes in TRPV4 plasma membrane abundance and basal activity.
  • Examined the impact of AIP4 on other TRP channel family members, including TRPC4.

Main Results:

  • AIP4 significantly increases TRPV4 ubiquitination without causing degradation.
  • AIP4 promotes TRPV4 endocytosis, reducing its plasma membrane levels and basal activity.
  • AIP4 also ubiquitylates TRPC4, decreasing its plasma membrane presence and activity.
  • AIP4 does not affect the ubiquitination of several other TRP channels.

Conclusions:

  • Ubiquitination by AIP4 is a key mechanism for controlling TRPV4 plasma membrane localization and activity.
  • AIP4-mediated ubiquitination regulates specific TRP channels, including TRPV4 and TRPC4, impacting their cellular function.

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