Considerations for Achieving Maximized DNA Recovery in Solid-Phase DNA-Encoded Library Synthesis

Area of Science:

• Chemical Biology
• Organic Chemistry
• Synthetic Chemistry

Background:

• DNA-encoded library (DEL) technology offers a powerful platform for exploring vast chemical spaces.
• Developing reactions compatible with DNA is crucial for DEL synthesis, but factors influencing DNA integrity are not well understood.

Purpose of the Study:

• To investigate factors affecting DNA compatibility in solid-phase reactions for DEL synthesis.
• To identify conditions that minimize DNA damage during chemical library construction.

Main Methods:

• Evaluated various solid-phase reactions and encoding conditions for their impact on DNA integrity.
• Tested strategies like solvent switching, low-temperature reactions, and using double-stranded DNA tags.
• Demonstrated the optimized approach in a multistep synthesis of an acyldepsipeptide (ADEP1) fragment.

Main Results:

• Conditions minimizing DNA tag accessibility, including solvent switching and low temperatures, significantly improved DNA compatibility.
• The multistep synthesis of ADEP1 using optimized conditions preserved 73% of the DNA.
• Achieved over a 100-fold improvement in DNA preservation compared to canonical reaction conditions.

Conclusions:

• Minimizing DNA tag accessibility is key to enhancing DNA compatibility in DEL reactions.
• This strategy enables high-quality library synthesis, particularly for complex natural product-like scaffolds.
• Reconciling DNA biophysics with chemical development is essential for advancing DEL technology.