Versatile protein biotinylation strategies for potential high-throughput proteomics.

Area of Science:

• Biochemistry
• Molecular Biology
• Proteomics

Background:

• Site-specific protein modification is crucial for biochemical and biophysical studies.
• Traditional protein tagging methods (e.g., GST, His-tag) have limitations in purification and immobilization.
• Biotinylation offers advantages for protein purification and immobilization due to its high affinity for avidin.

Purpose of the Study:

• To develop and present novel intein-mediated strategies for efficient, site-specific protein biotinylation.
• To demonstrate the versatility of these methods for various proteins and biological systems.
• To highlight the advantages of intein-mediated biotinylation over existing strategies.

Main Methods:

• Intein-assisted protein splicing to generate a reactive C-terminal thioester.
• Attachment of cysteine-containing biotin to the thioester site.
• Application of the method in vitro, in live bacterial and mammalian cells, and in cell-free systems.
• Immobilization of biotinylated proteins onto avidin-functionalized surfaces.

Main Results:

• Efficient and site-specific biotinylation of diverse proteins was achieved.
• Intein-mediated biotinylation was successful in various systems, including live cells.
• Biotinylated proteins were readily immobilized onto solid surfaces for applications like protein microarrays and SPR spectroscopy.
• The method demonstrated advantages over other protein biotinylation strategies.

Conclusions:

• Intein-mediated strategies provide a versatile and efficient approach for site-specific protein biotinylation.
• These methods are suitable for high-throughput proteomics and various biochemical/biophysical studies.
• The ability to perform biotinylation in live cells and cell-free systems expands its applicability.