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Related Experiment Video

Updated: Jun 5, 2026

Evaluation of Substrate Ubiquitylation by E3 Ubiquitin-ligase in Mammalian Cell Lysates

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Published on: May 10, 2022

Targeted ubiquitylation: the prey becomes predator.

Jun Yan¹, Yue Xiong

¹Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599-7295, USA.

|December 22, 2010

Summary

Yeast transcription factor Met4, targeted by SCF(Met30) E3 ligase for nonproteolytic polyubiquitylation, can also target cofactors for degradation. This dual role highlights complex regulation in protein ubiquitylation pathways.

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Area of Science:

Molecular biology
Biochemistry
Cellular regulation

Background:

Polyubiquitylation typically targets proteins for degradation.
The yeast transcription factor Met4 is regulated by the SCF(Met30) E3 ligase.
Nonproteolytic polyubiquitylation serves regulatory functions.

Discussion:

Ouni et al. show Met4, a substrate for nonproteolytic polyubiquitylation by SCF(Met30), also targets cofactors for degradation.
This demonstrates a dual role for Met4 in ubiquitylation.
The SCF(Met30) E3 ligase is involved in both nonproteolytic and proteolytic ubiquitylation pathways.

Key Insights:

Met4 acts as a scaffold, recruiting the SCF(Met30) E3 ligase to its cofactors.
This recruitment leads to the proteolytic ubiquitylation and subsequent degradation of cofactors.
The same E3 ligase mediates both nonproteolytic ubiquitylation of Met4 and proteolytic ubiquitylation of its cofactors.

Outlook:

Further investigation into the mechanisms of cofactor recruitment by transcription factors.
Understanding the broader implications of dual ubiquitylation roles in gene regulation.
Exploring therapeutic strategies targeting ubiquitylation pathways in disease.