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Chemically Stabilized DNA Barcodes for DNA-Encoded Chemistry.

Marco Potowski1, Verena B K Kunig1, Lukas Eberlein2

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Summary

Researchers developed more stable DNA barcodes for DNA-encoded libraries (DEL) by replacing adenine with 7-deazaadenine. This innovation expands the chemical reactions usable in DEL design, improving small molecule screening.

Keywords:
DNA-encoded chemistryDNA-encoded librariesmulticomponent reactionssolid-phase chemistrystabilized DNA barcodes

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Area of Science:

  • Medicinal Chemistry
  • Organic Chemistry
  • Biotechnology

Background:

  • DNA-encoded libraries (DEL) are crucial for small molecule screening.
  • Library design aims for diverse chemical space coverage.
  • Native DNA barcodes have limited chemical reactivity due to vulnerability.

Purpose of the Study:

  • To enhance the stability of DNA barcodes for DEL.
  • To expand the repertoire of chemical reactions applicable in DEL synthesis.
  • To overcome limitations posed by native DNA barcode reactivity.

Main Methods:

  • Substitution of chemically vulnerable purines in DNA barcodes with 7-deazaadenine.
  • Assessment of 7-deazaadenine's tautomerization stability for Watson-Crick pairing.
  • Demonstration of ligation-competent, amplifiable, and readable DNA barcodes.
  • Application of 16 diverse chemical reactions on controlled pore glass-coupled barcodes.

Main Results:

  • Developed DNA barcodes with enhanced stability against acid- and metal ion-promoted depurination.
  • Successfully translated 16 reactions, including multicomponent, Pictet-Spengler, Biginelli, and pyrazole syntheses.
  • Utilized Boc protective group for convenient encoded compound purification.
  • Enabled broader application of chemical reactions in DEL design.

Conclusions:

  • 7-deazaadenine substitution significantly improves DNA barcode stability.
  • Enhanced barcode stability broadens the scope of chemical reactions for DEL.
  • This advancement facilitates more diverse and efficient small molecule library design and screening.