Genetically encoded cleavable protein photo-cross-linker

Area of Science:

• Biochemistry
• Molecular Biology
• Proteomics

Background:

• Protein photo-cross-linking is crucial for studying protein interactions.
• Existing methods face challenges in separating cross-linked bait and prey proteins.
• Efficient capture of in situ generated intermediates is needed for detailed analysis.

Purpose of the Study:

• To develop a genetically encoded, selenium-based photo-cross-linker.
• To enable cleavage and capture of prey proteins after photo-cross-linking.
• To facilitate subsequent proteomic analysis of captured proteins.

Main Methods:

• Genetically encoding a selenium-based photo-cross-linker.
• Inducing protein photo-cross-linking.
• Cleaving the cross-linker to separate bait and prey.
• Capturing cleaved prey proteins using alkyne-tagged dimethoxyaniline.
• Labeling captured proteins with azide-bearing probes (fluorophore or biotin).

Main Results:

• Successful development of a selenium-based cleavable photo-cross-linker.
• Demonstration of efficient capture of in situ generated selenenic acid on cleaved prey proteins.
• Facilitation of prey protein capture for 2D gel and mass spectrometry analysis.

Conclusions:

• The developed selenium-based photo-cross-linker enables efficient separation and capture of interacting proteins.
• This cleavage-and-capture strategy enhances the accessibility of prey proteins for proteomic studies.
• The method provides a valuable tool for investigating complex protein interactions.