Co-fractionation/mass spectrometry to identify protein complexes

Area of Science:

• Biochemistry
• Proteomics
• Molecular Biology

Background:

• Co-fractionation/mass spectrometry (CF/MS) is a powerful method for detecting protein-protein physical associations.
• Existing CF/MS methods can be limited by the need for specific antibodies or tags, and may not be universally applicable across diverse biological samples.

Purpose of the Study:

• To present adaptable protocols for mass spectrometry (MS) sample preparation for CF/MS analysis.
• To introduce a computational pipeline (cfmsflow) to facilitate the application of CF/MS.
• To demonstrate the broad applicability of the developed CF/MS approach across various organisms.

Main Methods:

• Two distinct protocols for MS sample preparation were developed, accommodating both low and high salt conditions.
• A computational pipeline, cfmsflow, was created to process and analyze CF/MS data.
• The protocols were validated using CF/MS on over 16 diverse organisms, including plants and animals.

Main Results:

• The presented protocols and cfmsflow pipeline enable successful application of CF/MS.
• The methodology is shown to be effective across a wide range of biological systems, confirming its versatility.
• The approach does not require protein-specific antibodies or epitope tags, enhancing its general utility.

Conclusions:

• The developed CF/MS protocols and computational pipeline offer a flexible and powerful approach for identifying protein physical associations.
• This methodology is broadly applicable to any tissue or organism, significantly advancing proteomic interaction studies.
• The study provides a comprehensive framework for researchers to implement CF/MS effectively.