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Universal encoding of next generation DNA-encoded chemical libraries.

Louise Plais1, Alice Lessing1, Michelle Keller1

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|February 25, 2022
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Summary

We developed a new DNA encoding strategy, "large encoding design" (LED), for constructing larger and more complex DNA-encoded chemical libraries (DELs). This method enhances the diversity and purity of dual-pharmacophore DELs for drug discovery.

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Area of Science:

  • Medicinal Chemistry
  • Molecular Biology
  • Drug Discovery

Background:

  • DNA-encoded chemical libraries (DELs) are powerful tools for identifying small molecule ligands for pharmaceutical targets.
  • Dual-pharmacophore DELs offer increased diversity and the potential to target larger protein surfaces compared to single-pharmacophore designs.
  • Existing encoding methods for dual-display DELs are limited in complexity.

Purpose of the Study:

  • To introduce a novel and efficient DNA encoding strategy, termed "large encoding design" (LED), for constructing complex dual-display DELs.
  • To enable the creation of highly diverse and pure DELs with multiple coding regions on partially complementary DNA strands.
  • To improve the amplifiability and performance of DELs in screening against protein targets.

Main Methods:

  • Development of the "large encoding design" (LED) methodology for encoding multiple DNA tags.
  • Experimental implementation of multiple coding regions within the LED framework.
  • Comparative analysis of LED against existing dual-display DEL encoding strategies using PCR amplification and selection assays.
  • Testing the performance of LED-based DELs against two target proteins.

Main Results:

  • The LED methodology facilitates PCR-amplification of multiple DNA codes distributed across two partially complementary DNA strands.
  • Experimental implementation demonstrated the robustness and convenience of the LED encoding scheme.
  • LED-based DELs showed comparable or improved amplifiability and performance in selection assays versus previous dual-display DEL modalities.
  • The new encoding strategy supports the construction of DELs with unprecedented sizes and designs.

Conclusions:

  • The "large encoding design" (LED) is a robust and versatile method for creating complex dual-display DNA-encoded chemical libraries.
  • LED overcomes limitations of previous encoding strategies, enabling the generation of larger and more diverse chemical libraries.
  • This advancement holds significant potential for accelerating the discovery of novel small molecule ligands in pharmaceutical research.