Achieving cell-type-specific bioorthogonal chemistry using enzyme-activated caged tetrazines

Area of Science:

• Biochemistry
• Molecular Biology
• Chemical Biology

Background:

• Bioorthogonal reactions are crucial for molecular conjugation within cells.
• Classical bioorthogonal reagents lack specificity in complex biological systems with multiple cell types.
• Developing precise bioorthogonal tools for targeted cellular applications remains a challenge.

Purpose of the Study:

• To develop a cell-type-specific bioorthogonal chemistry method.
• To enable precise control over bioorthogonal reactions based on cellular enzyme activity.
• To demonstrate applications in targeted drug delivery and imaging.

Main Methods:

• Utilized caged dihydrotetrazine derivatives activated by specific cellular enzymes (TRACE).
• Optimized dihydrotetrazine scaffold electronic properties for rapid uncaging and tetrazine activation.
• Demonstrated TRACE in coculture systems and for subcellular imaging agent delivery.

Main Results:

• TRACE achieved rapid uncaging and activation of tetrazines within minutes.
• Successfully demonstrated targeted release of cytotoxic drugs, selectively killing enzyme-expressing cells.
• Enabled enzyme-activity-dependent delivery of imaging agents to specific subcellular structures.

Conclusions:

• TRACE provides a novel method for programmable, cell-type-specific bioorthogonal chemistry.
• This approach enhances precision in therapeutic applications by targeting specific cell populations.
• TRACE offers significant potential for advanced imaging and drug delivery strategies in biological research.