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Analysis of Human Nuclear Protein Complexes by Quantitative Mass Spectrometry Profiling
Katelyn E Connelly1, Victoria Hedrick2, Tiago Jose Paschoal Sobreira2
1Department of Medicinal Chemistry and Molecular Pharmacology, Purdue University, 201 S. University Street, 47907, West Lafayette, IN, USA.
Proteomics
|April 15, 2018
Summary
Researchers profiled human nuclear protein complexes using size exclusion chromatography and mass spectrometry. This method identified numerous protein complexes, advancing our understanding of nuclear proteome organization and function.
Area of Science:
- Proteomics
- Molecular Biology
- Cellular Biology
Background:
- Protein complexes are crucial for cellular functions.
- Limited information exists on human nuclear protein complexes.
- Advances in proteomic techniques are needed for nuclear complex analysis.
Purpose of the Study:
- To characterize human nuclear protein complexes.
- To develop a method for profiling nuclear proteomes.
- To identify novel and known nuclear protein assemblies.
Main Methods:
- Native size exclusion chromatography (SEC) coupled with label-free quantitative mass spectrometry (MS).
- Analysis of nuclear protein complexes from human glioblastoma T98G cells.
- Co-immunoprecipitation (co-IP) experiments for validation.
Main Results:
- Identified 1794 overlapping proteins across replicates; 1244 formed stable complexes.
- Confirmed interactions of PARP1, HDAC1, and deacetylase complex components.
- Demonstrated SEC-MS utility for identifying novel and moonlighting complexes.
Conclusions:
- SEC-MS is effective for system-wide profiling of nuclear protein complexes.
- The study provides a foundation for understanding nuclear proteome organization.
- This approach can reveal distinct forms of nuclear protein complexes.
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