Protocol for conditional mapping of proximal interactomes of dimeric protein complexes using a BioID-based...

Area of Science:

• Biochemistry
• Molecular Biology
• Proteomics

Background:

• Understanding protein complex interactions is crucial for elucidating cellular mechanisms.
• Existing methods for mapping proximal interactomes can be limited in scope and application.

Purpose of the Study:

• To develop and present a protocol for conditional mapping of proximal interactomes of dimeric protein complexes.
• To enable the identification of proteins in close proximity to specific dimeric protein complexes within cells.

Main Methods:

• A BioID-based complementation approach utilizing fragments of the biotin ligase TurboID.
• Fusing protein fragments to known interacting proteins to reconstitute an active ligase.
• Biotinylation of proximal proteins, followed by capture on a streptavidin affinity matrix.
• Identification of biotinylated proteins via mass spectrometry and analysis using Python scripts.

Main Results:

• Successful conditional mapping of proximal interactomes for dimeric protein complexes.
• Identification of high-confidence proximal interactors based on the developed protocol.
• Demonstration of a robust method for proximity-dependent biotinylation.

Conclusions:

• The presented protocol offers a powerful tool for studying protein-protein interactions in dimeric complexes.
• This method facilitates the discovery of novel interactors and the characterization of protein complex organization.
• The approach is valuable for advancing research in molecular biology and proteomics.