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This summary is machine-generated.

This study introduces a microfluidic platform for directly screening DNA-encoded libraries (DELs) for activity, accelerating drug discovery. The method identified active inhibitors, enabling efficient small molecule candidate selection.

Keywords:
DNA-encoded libraryOBOCdropletdrug discoverymicrofluidics

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Area of Science:

  • Biochemistry
  • Chemical Biology
  • Microfluidics

Background:

  • High-throughput screening (HTS) and DNA-encoded library (DEL) screening are key for discovering bioactive compounds.
  • HTS uses activity-based assays with static libraries, while DEL screening offers chemical diversity but is limited to affinity-based methods.

Purpose of the Study:

  • To develop an integrated droplet-based microfluidic circuit for direct activity screening of solid-phase DELs.
  • To demonstrate the platform's utility in identifying active small molecule inhibitors and compare it with affinity-based DEL screening.

Main Methods:

  • Development of a droplet-based microfluidic system for screening solid-phase DELs.
  • Screening a 67,100-member DEL library against the phosphodiesterase autotaxin.
  • Validation of identified hits through nanomole-scale synthesis and IC50 determination.

Main Results:

  • The platform successfully screened a DEL library, identifying 35 high-priority structures, with 20 showing activity against autotaxin.
  • Five selected compounds were synthesized at scale, all exhibiting IC50 values between 4-10 μM.
  • Comparison with affinity-based DEL selection highlighted the distinct advantages of activity-based screening.

Conclusions:

  • The miniaturized microfluidic platform enables direct activity screening of DELs, overcoming limitations of traditional methods.
  • This approach facilitates the discovery of potent small molecules and can be applied to more complex biological targets.
  • The technology offers a distributable and efficient strategy for small molecule discovery.