The dTAG system for immediate and target-specific protein degradation

Area of Science:

• Chemical Biology
• Molecular Biology
• Genetics

Background:

• Studying complex biological systems necessitates precise control over protein function and abundance.
• Existing genetic methods face limitations like off-target effects, complexity, and irreversible changes, hindering timely analysis.
• A significant challenge is the delay between manipulating proteins and observing experimental outcomes.

Purpose of the Study:

• To develop a chemical biology system for immediate and selective control of single protein abundance.
• To create a generalizable strategy for studying the immediate consequences of protein loss.
• To enable kinetic resolution in biological investigations and facilitate target validation in drug discovery.

Main Methods:

• Development of the dTAG system, a chemical biology platform using cell-permeable heterobifunctional degraders.
• Pairing a novel degrader of FKBP12^F36V with the expression of FKBP12^F36V fused to a protein of interest.
• Utilizing transgene expression or CRISPR-mediated locus-specific knock-in for protein manipulation.

Main Results:

• Demonstrated an unexpected superior antiproliferative effect of pan-BET bromodomain degradation compared to selective BRD4 degradation.
• Characterized the immediate effects of KRAS^G12V loss on proteomic signaling pathways.
• Showcased rapid protein degradation in vivo using the dTAG system.

Conclusions:

• The dTAG system provides a powerful platform for achieving kinetic resolution in biological studies.
• This technology enables the immediate investigation of protein loss consequences, crucial for understanding cellular mechanisms.
• The dTAG system offers a valuable tool for target validation in the context of drug discovery and development.