Tuning the Reactivity of a Substrate for SNAP-Tag Expands Its Application for Recognition-Driven DNA-Protein...

Area of Science:

• Biochemistry
• Molecular Biology
• Synthetic Biology

Background:

• Recognition-driven modification offers site-specific biomolecular engineering.
• Protein modular adaptors (MAs) combine DNA recognition and self-ligation for targeted modification.
• Existing SNAP-tag substrates show nonselective reactions with DNA.

Purpose of the Study:

• To design novel SNAP-tag substrates for sequence-selective DNA modification.
• To achieve rapid and efficient crosslinking reactions using MAs.
• To establish orthogonal DNA-protein crosslinking capabilities.

Main Methods:

• Design and synthesis of new SNAP-tag substrates.
• Kinetic analyses to verify reaction efficiency and selectivity.
• Demonstration of orthogonal crosslinking with CLIP-tag and multiple MAs.

Main Results:

• Newly designed SNAP-tag substrates enable sequence-selective reactions with DNA.
• Kinetic studies confirmed rapid and efficient crosslinking.
• Distinct orthogonality between SNAP-tag and CLIP-tag was achieved for multiplexed DNA-protein crosslinking.

Conclusions:

• Novel SNAP-tag substrates facilitate highly specific DNA-protein crosslinking via MAs.
• This approach enables orthogonal modification strategies for complex biological systems.
• The developed method advances the field of site-specific DNA engineering.