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Related Experiment Video

Updated: Jan 7, 2026

In Vitro Analysis of E3 Ubiquitin Ligase Function
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E2 variants for probing E3 ubiquitin ligase activities.

Jiale Du1, Gisele A Andree1, Daniel Horn-Ghetko1

  • 1Department of Molecular Machines and Signaling, Max Planck Institute of Biochemistry, Martinsried 82152, Germany.

Proceedings of the National Academy of Sciences of the United States of America
|January 2, 2026
PubMed
Summary
This summary is machine-generated.

Researchers developed novel E2 variants (E2Vs) to specifically target RING-between-RING (RBR) E3 ligases. This technology enables detailed analysis of E3 ligase functions and their roles in cellular signaling pathways.

Keywords:
E2E3 ligaseRBRactivity-based probeubiquitin

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Structural Biology

Background:

  • E3 ligases and E2 enzymes are crucial for eukaryotic biology.
  • The large number of E3 ligases (>600) and E2 enzymes (~40) in humans necessitates E2 enzymes co-functioning with multiple E3 ligases.
  • Understanding these complex interactions is vital for deciphering cellular processes.

Purpose of the Study:

  • To develop a method for interrogating specific E3 ligase pathways.
  • To create E2 variants (E2Vs) with enhanced affinity and specificity for RING-between-RING (RBR) E3 ligases.
  • To enable detailed mechanistic and structural analysis of E3 ligase functions.

Main Methods:

  • Screening of phage-displayed libraries of structure-based E2 variants (E2Vs).
  • Focus on RBR E3 ligases and UBE2L3/UBE2D-family E2 enzymes.
  • Utilizing cryogenic electron microscopy (cryo-EM) for structural analysis.

Main Results:

  • Discovery of E2Vs with enhanced affinity and specificity for multiple RBR E3 ligases (ARIH1, ARIH2, ANKIB1, CUL9, HOIL1, HOIP, RNF14).
  • Successful differentiation of functions between co-functioning E3 ligases.
  • Obtained high-resolution cryo-EM structures of RBR E3 ligase complexes.
  • Profiled endogenous RBR E3 ligase responses to extracellular stimuli.

Conclusions:

  • E2V technology provides a generalizable tool for in-depth analysis of E3 ligase functions.
  • This approach facilitates mechanistic and structural studies of E3 ligase pathways.
  • E2Vs aid in mapping E3 ligase activity states and protein interactions in cellular signaling.