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Updated: Jun 25, 2026

In Vitro Analysis of E3 Ubiquitin Ligase Function
06:06

In Vitro Analysis of E3 Ubiquitin Ligase Function

Published on: May 14, 2021

Adaptor-mediated interaction between Kv1.3 and Nedd4-2 E3 ubiquitin ligase

Irene Estadella1, Anna Benavente-Garcia1, Jesusa Capera1,2

  • 1Molecular Physiology Laboratory, Departament de Bioquímica i Biomedicina Molecular, Institut de Biomedicina (IBUB), Universitat de Barcelona, Diagonal 643, Barcelona, Spain.

Communications Biology
|June 23, 2026
PubMed

Insights

The voltage-gated potassium channel Kv1.3, vital for immune responses, is regulated by Nedd4-2. Adaptor proteins Ndfip1 and 14-3-3 facilitate Kv1.3 degradation, preventing chronic inflammation.

Area of Science:

  • Immunology
  • Molecular Biology
  • Cell Biology

Background:

  • The voltage-gated potassium channel Kv1.3 plays a critical role in immune cell function.
  • Upregulation of Kv1.3 enhances leukocyte activation and Ca²⁺ signaling during inflammation.
  • Elevated Kv1.3 levels are associated with chronic inflammatory conditions.

Purpose of the Study:

  • To investigate the regulatory mechanism of Kv1.3 degradation.
  • To identify adaptor proteins mediating the interaction between Nedd4-2 and Kv1.3.
  • To elucidate the role of Nedd4-2 in controlling Kv1.3 levels in immune cells.

Main Methods:

  • Co-immunoprecipitation assays to study protein interactions.
  • Confocal microscopy to visualize protein localization.
  • Ubiquitination assays to assess protein modification.
  • Biochemical assays to analyze lysosomal degradation pathways.

Main Results:

  • Nedd4-2 targets Kv1.3 for ubiquitination and lysosomal degradation.
  • Nedd4-2 interacts with Kv1.3 via adaptor proteins Ndfip1 and 14-3-3 proteins.
  • PKC activation triggers rapid Kv1.3 internalization and degradation mediated by Nedd4-2.
  • Ndfip1 is identified as a key adaptor in the Nedd4-2-Kv1.3 regulatory axis.

Conclusions:

  • Nedd4-2, with adaptors Ndfip1 and 14-3-3, controls Kv1.3 levels through degradation.
  • This pathway is crucial for resolving lymphocyte activation and preventing chronic inflammation.
  • Targeting Nedd4-2 adaptors may offer therapeutic strategies for inflammatory diseases.

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