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Degron masking outlines degronons, co-degrading functional modules in the proteome
Mainak Guharoy1,2,3, Tamas Lazar4,5, Mauricio Macossay-Castillo4,5
1VIB-VUB Center for Structural Biology, Pleinlaan 2, 1050, Brussels, Belgium. mainak.guharoy@vib.be.
Communications Biology
|May 11, 2022
Summary
Cellular protein degradation is coordinated by degron masking, where protein interactions prevent degradation. This study reveals how these interactions form co-regulated protein degradation modules called
Area of Science:
- Molecular Biology
- Proteomics
- Systems Biology
Background:
- Protein complexes and pathways require coordinated regulation of transcription, translation, and degradation.
- Cooperative degradation regulation of protein complexes and pathways remains understudied.
- Degron masking is a key mechanism for coordinating protein degradation.
Purpose of the Study:
- To comprehensively analyze degron masking as a mechanism for protein degradation regulation.
- To investigate the overlap between degrons and protein-protein interaction sites.
- To identify higher-order, co-regulated degradation modules in the proteome.
Main Methods:
- Analysis of over 200 substrates with characterized degrons.
- Examination of binding site information and protein abundance data.
- Integrative analysis of gene co-expression, half-life correlations, and functional relationships.
Main Results:
- Degrons extensively overlap with protein-protein interaction sites.
- Regulatory partners outcompete E3 ligases, masking degrons from ubiquitination machinery.
- Protein abundance variations in cancer cells highlight degron masking dynamics.
Conclusions:
- Degron masking is a widespread mechanism regulating protein degradation.
- Protein interactions play a crucial role in controlling protein stability.
- The proteome contains higher-order, co-regulated degradation modules ('degronons').
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