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Ca2+-driven E3 ligase activity.

John F Foley1

  • 1Science Signaling, AAAS, Washington, DC 20005, USA.

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|December 9, 2025
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Summary
This summary is machine-generated.

A newly identified E3 ubiquitin ligase, dependent on calcium and calmodulin, triggers nuclear factor-kappa B (NF-κB) activation in intestinal cells. This finding reveals a novel mechanism regulating inflammatory responses within the gut.

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Area of Science:

  • Cellular biology
  • Molecular biology
  • Immunology

Background:

  • Nuclear factor-kappa B (NF-κB) is a critical transcription factor regulating immune responses and inflammation.
  • Dysregulation of NF-κB signaling is implicated in various intestinal diseases.

Purpose of the Study:

  • To investigate the role of Ca2+-calmodulin-dependent E3 ubiquitin ligases in mediating NF-κB activation in intestinal cells.

Main Methods:

  • Utilized cell culture models of intestinal cells.
  • Employed biochemical assays to assess E3 ubiquitin ligase activity.
  • Performed Western blotting and reporter assays to measure NF-κB activation.

Main Results:

  • Identified a specific Ca2+-calmodulin-dependent E3 ubiquitin ligase.
  • Demonstrated that this ligase directly mediates NF-κB activation in intestinal cells.
  • Showcased the ligase's role in calcium- and calmodulin-dependent signaling pathways.

Conclusions:

  • A Ca2+-calmodulin-dependent E3 ubiquitin ligase is a key regulator of NF-κB activation in the intestine.
  • This ligase represents a potential therapeutic target for intestinal inflammatory conditions.