BioSITe: A Method for Direct Detection and Quantitation of Site-Specific Biotinylation

Area of Science:

• Biochemistry
• Proteomics
• Chemical Biology

Background:

• Biotin-based labeling is crucial for studying protein interactions, proteomes, and post-translational modifications.
• Current methods struggle with efficient recovery of biotinylated peptides for analysis.
• Streptavidin's high affinity for biotin aids protein capture but not peptide recovery.

Purpose of the Study:

• To introduce Biotinylation Site Identification Technology (BioSITe) for capturing biotinylated peptides.
• To demonstrate BioSITe's utility with proximity labeling (APEX, BioID) and click chemistry.
• To enable quantitative analysis using isotopically labeled biotin, simplifying interactome studies.

Main Methods:

• Development and application of the Biotinylation Site Identification Technology (BioSITe).
• Utilizing BioSITe with proximity-dependent labeling (APEX, BioID) and click chemistry.
• Employing isotopically labeled biotin for quantitative proteomic analysis.

Main Results:

• BioSITe effectively captures biotinylated peptides for LC-MS/MS analysis.
• Demonstrated utility with APEX, BioID, and O-GlcNAc site identification.
• Quantitative BioSITe experiments simplify differential interactome analysis without metabolic labeling.
• Site-specific biotinylation provides valuable spatial and topological protein information.

Conclusions:

• BioSITe offers a superior strategy for the detection of biotinylation sites.
• The technology streamlines quantitative interactome analysis and site-specific mapping.
• BioSITe is poised to replace conventional methods in biotinylation site detection studies.