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Inhibition of Cdk Activity02:34

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The orderly progression of the cell cycle depends on the activation of Cdk protein by binding to its cyclin partner. However, the cell cycle must be restricted when undergoing abnormal changes. Most cancers correlate to the deregulated cell cycle, and since Cdks are a central component of the cell cycle, Cdk inhibitors are extensively studied to develop anticancer agents. For instance, cyclin D associates with several Cdks, such as Cdk 4/6, to form an active complex. The cyclin D-Cdk4/6 complex...
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Checkpoints throughout the cell cycle serve as safeguards and gatekeepers, allowing the cell cycle to progress in favorable conditions and slow or halt it in problematic ones. This regulation is known as the cell cycle control system.
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Related Experiment Video

Updated: Apr 10, 2026

Development of Inhibitors of Protein-protein Interactions through REPLACE: Application to the Design and Development Non-ATP Competitive CDK Inhibitors
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Nanoscale Direct-to-Biology Optimization of Cdk2 Inhibitors.

James L Douthwaite1, Damian J Houde2, Eneida Pardo2

  • 1Department of Medicinal Chemistry, College of Pharmacy, University of Michigan, Ann Arbor, Michigan 48109, United States.

Journal of Medicinal Chemistry
|April 9, 2026
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Summary

This study introduces nanoscale hit-to-lead optimization using direct-to-biology (D2B) assays for synthesizing Cdk2/CycE inhibitors. This approach accelerates drug discovery by bypassing compound purification, enabling faster screening.

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Area of Science:

  • * Medicinal Chemistry
  • * Chemical Biology
  • * Drug Discovery

Background:

  • * High-throughput synthesis generates large compound libraries, but purification becomes a bottleneck.
  • * Direct-to-biology (D2B) approaches bypass purification for direct bioassay screening.
  • * Miniaturization and ultrahigh-throughput experimentation (ultraHTE) are key to efficient screening.

Purpose of the Study:

  • * To explore nanoscale hit-to-lead optimization using D2B.
  • * To synthesize and screen a library of Cdk2/CycE inhibitors via ultraHTE.
  • * To assess the efficiency of D2B in functional biochemical, bioaffinity, and crystallographic assays.

Main Methods:

  • * Multistep synthesis of a Cdk2/CycE inhibitor library in 1,536-well plates.
  • * Ultrahigh-throughput experimentation (ultraHTE) for library synthesis.
  • * Direct-to-biology (D2B) screening including biochemical, bioaffinity, and X-ray crystallography assays.
  • * Phenotypic cell painting assay for lead compound validation.

Main Results:

  • * Successful synthesis and D2B screening of a Cdk2/CycE inhibitor library.
  • * Identification of potent lead inhibitors through D2B assays.
  • * Phenotypic assays confirmed Cdk2 inhibition, showing G0 cell cycle arrest.

Conclusions:

  • * Nanoscale hit-to-lead optimization via D2B and ultraHTE significantly accelerates early drug discovery.
  • * This miniaturized workflow streamlines the screening cascade, reducing time and resources.
  • * D2B approaches are effective for profiling compound libraries in functional assays.