A TurboID-based proximity labelling approach for identifying the DNA-binding proteins

Area of Science:

• Molecular Biology
• Proteomics
• Biochemistry

Background:

• Mapping protein-DNA interactions is crucial for understanding gene regulation.
• Traditional methods often fail to capture transient or weak binding events.
• Biotin proximity labeling offers a powerful approach to identify interacting proteins.

Purpose of the Study:

• To present a detailed protocol for identifying specific DNA-sequence-binding proteins.
• To leverage TurboID enzyme-based biotin proximity labeling for enhanced interaction mapping.
• To overcome limitations of existing techniques in capturing dynamic protein-DNA interactions.

Main Methods:

• Utilizing TurboID enzyme for biotin proximity labeling of DNA-binding proteins.
• Implementing protein enrichment strategies post-labeling.
• Employing sodium dodecyl sulfate polyacrylamide gel electrophoresis (SDS-PAGE) for protein separation.
• Conducting proteomic analysis to identify labeled proteins.

Main Results:

• The protocol successfully identifies proteins that bind to specific DNA sequences.
• Weak and dynamic protein-DNA interactions previously difficult to detect are now mappable.
• The method provides a comprehensive list of DNA-binding proteins associated with a target sequence.

Conclusions:

• The presented protocol offers a robust method for mapping DNA-binding proteins.
• This technique significantly advances the ability to study protein-DNA interactions.
• The protocol is valuable for researchers investigating gene regulation and molecular mechanisms.