An efficient fluorescent protein-based multifunctional affinity purification approach in mammalian cells

Area of Science:

• Proteomics
• Molecular Biology
• Cell Biology

Background:

• Understanding protein modifications, binding partners, and localization is crucial for deciphering biological networks.
• A previously developed fluorescent protein-based (mVenus) multifunctional affinity purification (MAP) tag facilitates protein purification and localization studies.
• MAP-purified complexes can be analyzed via LC-MS/MS to identify binding partners and post-translational modifications.

Purpose of the Study:

• To provide a detailed description of the general MAP purification method.
• To demonstrate the application of the MAP tag for analyzing a specific protein, human Cdc14B phosphatase.

Main Methods:

• Utilizing a fluorescent protein-based (mVenus) multifunctional affinity purification (MAP) tag.
• Employing Fluorescence-Activated Cell Sorting (FACS) for rapid selection of stable cell lines.
• Performing Liquid Chromatography-Tandem Mass Spectrometry (LC-MS/MS) for protein complex analysis.

Main Results:

• The MAP tag is highly efficient and exhibits minimal variability across different proteins.
• The MAP approach allows for rapid FACS-selection of cell lines based on MAP-protein fusion expression.
• Detailed methodology for MAP purification is presented, with successful application to human Cdc14B phosphatase.

Conclusions:

• The MAP tag is a robust and versatile tool for comprehensive protein analysis, including purification, localization, and interaction studies.
• The method facilitates efficient identification of protein binding partners and post-translational modifications.
• The MAP tag simplifies cell line selection and protein complex characterization in biological research.