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Updated: Jun 30, 2025

In Situ Monitoring of Transiently Formed Molecular Chaperone Assemblies in Bacteria, Yeast, and Human Cells
Published on: September 2, 2019
Covalent hitchhikers guide proteins to the nucleus
Alexander F Russell1, Madeline F Currie1, Champak Chatterjee1
1Department of Chemistry, University of Washington, Seattle, WA 98195, USA.
Researchers combined chemoproteomics and proximity labeling to find reactive cysteines in nuclear proteins. This novel method identified proteins localized to the nucleus and chromatin after probe labeling.
Area of Science:
- Biochemistry
- Chemical Biology
- Proteomics
Background:
- Cysteine residues in nuclear proteins are crucial targets for chemical probes.
- Identifying reactive cysteines within the nucleus is challenging due to cellular complexity.
Purpose of the Study:
- To develop and apply a novel chemoproteomic strategy for identifying reactive cysteines in nuclear proteins.
- To discover proteins that localize to the nucleus and chromatin upon electrophilic probe labeling.
Main Methods:
- Integration of chemoproteomic techniques with proximity-based labeling.
- Application of electrophilic probe compounds to label reactive cysteines.
- Analysis of labeled proteins to determine nuclear and chromatin localization.
Main Results:
- Successful identification of specific cysteine residues in nuclear proteins reactive to electrophilic probes.
- Discovery of novel nuclear and chromatin-associated proteins targeted by the probes.
- Demonstration of the technology's capability in mapping protein reactivity within the nucleus.
Conclusions:
- The combined chemoproteomic and proximity labeling approach is effective for identifying reactive cysteines in nuclear proteins.
- This methodology provides new insights into protein function and drug target engagement within the nucleus.
- The study expands the toolkit for exploring nuclear protein interactions and chemical biology.
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