DNA display III. Solid-phase organic synthesis on unprotected DNA.

Area of Science:

• Organic Chemistry
• Molecular Biology
• Biotechnology

Background:

• DNA-directed synthesis is crucial for molecular discovery.
• Executing diverse chemical reactions on unprotected DNA is challenging.
• Existing methods often require DNA protection, limiting reaction scope.

Purpose of the Study:

• To develop a versatile solid-phase reaction format for chemical transformations on unprotected DNA.
• To demonstrate the compatibility of standard organic reactions with DNA supports.
• To enable the synthesis of diverse chemical libraries on DNA.

Main Methods:

• Established a solid-phase reaction system compatible with standard organic reagents and conditions.
• Adapted solid-phase 9-fluorenylmethyoxycarbonyl-based peptide synthesis for DNA compatibility.
• Developed tools for adapting other chemistries to unprotected DNA supports.

Main Results:

• Achieved efficient peptide coupling to DNA for all 33 tested amino acids.
• Successfully synthesized polypeptides up to 12 amino acids long on DNA supports.
• Demonstrated a general strategy for organic synthesis directly on unprotected DNA.

Conclusions:

• The developed solid-phase method broadens the scope of DNA-directed synthesis.
• This approach facilitates the creation of chemically diverse DNA-encoded molecular libraries.
• Enables advancements in in vitro evolution and genetic manipulation through novel molecular populations.