An integrated workflow for charting the human interaction proteome: insights into the PP2A system.

Area of Science:

• Proteomics
• Molecular Biology
• Systems Biology

Background:

• Protein complexes are crucial for biological processes.
• Systematic affinity purification coupled with mass spectrometry (AP-MS) has mapped yeast protein complexes.
• Existing AP-MS methods for human protein complexes lack throughput, sensitivity, and robustness for systems biology.

Purpose of the Study:

• To develop and benchmark a novel integrated method for high-throughput, sensitive, and robust AP-MS analysis of human protein complexes.
• To overcome limitations of current AP-MS procedures for large-scale human proteome studies.

Main Methods:

• Development of a novel integrated affinity purification coupled with mass spectrometry (AP-MS) method.
• Application and benchmarking of the method using the human protein phosphatase 2A system.
• Identification of protein interactions with high reproducibility.

Main Results:

• Identified 197 high-reproducibility protein interactions within the human protein phosphatase 2A system.
• Revealed distinct classes of phosphatase complexes associated with key cellular processes like mitosis, cell signaling, and DNA damage control.
• Demonstrated substantial advancement in throughput and reproducibility for AP-MS studies.

Conclusions:

• The novel integrated AP-MS method significantly improves throughput and reproducibility for human protein complex analysis.
• This advancement facilitates more comprehensive systems biology research on human protein complexes.
• The findings provide insights into the functional organization of human phosphatase complexes.