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A quantitative proteomics analysis of subcellular proteome localization and changes induced by DNA damage
François-Michel Boisvert1, Yun Wah Lam, Douglas Lamont
1The Wellcome Trust Centre for Gene Regulation and Expression, University of Dundee, MSI/WTB/JBC Complex, Dow Street, Dundee DD1 5EH, Scotland, United Kingdom.
Molecular & Cellular Proteomics : MCP
|December 23, 2009
Summary
Spatial proteomics uses mass spectrometry to map protein locations within cells, offering a high-throughput method to study protein distribution and dynamic changes, such as during DNA damage responses.
Area of Science:
- Cell Biology
- Proteomics
- Molecular Biology
Background:
- Determining protein subcellular localization is crucial for understanding cell function.
- Traditional methods like microscopy and cell fractionation are low-throughput and limited.
- A high-throughput, unbiased method is needed to map the proteome's spatial distribution.
Purpose of the Study:
- To develop and apply a mass spectrometry-based spatial proteomics approach.
- To quantitatively measure the subcellular distribution of thousands of proteins.
- To investigate dynamic changes in protein localization in response to cellular perturbations.
Main Methods:
- Developed "spatial proteomics" using differentially labeled subcellular fractions.
- Utilized mass spectrometry for quantitative proteome-wide analysis.
- Applied the method to HCT116 cells under normal and DNA-damaging conditions (etoposide treatment).
Main Results:
- Mapped the steady-state distribution of over 2,000 proteins across cytoplasm, nucleus, and nucleolus.
- Demonstrated that most proteins reside in specific compartments.
- Observed dynamic protein relocation upon DNA damage, including proteasome complex remodeling.
Conclusions:
- Spatial proteomics provides an unbiased, quantitative, and high-throughput method for analyzing protein localization.
- The proteome is largely compartmentalized, with dynamic redistribution occurring under stress.
- DNA damage induces significant changes in protein localization, impacting proteasome function.
