Multiplexed Proximity Biotinylation Coupled to Mass Spectrometry for Defining Integrin Adhesion Complexes

Area of Science:

• Cell Biology
• Biochemistry

Background:

• Traditional methods struggle with insoluble and transient proteins in complexes.
• Integrin adhesion complexes (IACs) link the plasma membrane to the actin cytoskeleton.
• Understanding IAC architecture is crucial for cellular processes.

Purpose of the Study:

• To apply BioID proximity biotinylation to study IACs.
• To identify novel proximal interactors of IACs.
• To gain insights into IAC architecture and protein network topology.

Main Methods:

• Utilized BioID proximity-dependent biotinylation.
• Employed multiple BioID baits for complex-wide annotation.
• Performed label-free quantitative mass spectrometry for protein analysis.
• Conducted bioinformatic analyses for network interrogation.

Main Results:

• Successfully mapped IAC-proximal proteins.
• Identified novel interactors and provided spatial annotation.
• Enabled insights into IAC architecture and protein network topology.
• Established protocols for BioID application in IAC studies.

Conclusions:

• BioID is a powerful technique for studying protein complexes like IACs.
• This approach facilitates the discovery of novel interactors and understanding of complex organization.
• The described methods provide a framework for future proximity interactome studies.