Related Experiment Video

Updated: Jun 15, 2025

Development of Inhibitors of Protein-protein Interactions through REPLACE: Application to the Design and Development Non-ATP Competitive CDK Inhibitors
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Development of Inhibitors of Protein-protein Interactions through REPLACE: Application to the Design and Development Non-ATP Competitive CDK Inhibitors

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Elucidating the Selective Mechanism of Drugs Targeting Cyclin-Dependent Kinases with Integrated MetaD-US Simulation

Lingling Wang1,2, Shu Li1, Sutong Xiang2

  • 1Centre for Artificial Intelligence Driven Drug Discovery, Faculty of Applied Sciences, Macao Polytechnic University, Macao 999078, China.

Journal of Chemical Information and Modeling
|August 22, 2024
PubMed

Insights

SR4835 selectively targets CDK12/13 kinases, crucial for cancer therapy. An innovative IMUS method reveals selectivity arises from specific H-bond stability and interactions within the kinase Hinge region.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Pharmacology

Background:

  • Cyclin-dependent kinases (CDKs), particularly CDK12 and CDK13, are critical regulators of the cell cycle and RNA polymerase II activity.
  • These CDKs represent important therapeutic targets for various cancers, including triple-negative breast cancer.

Purpose of the Study:

  • To elucidate the selective inhibition mechanism of SR4835 against CDK13/12/9.
  • To characterize the drug-target interactions and binding free energy accurately.

Main Methods:

  • Development and application of an innovative enhanced sampling method: integrated well-tempered metadynamics-umbrella sampling (IMUS).
  • IMUS combines well-tempered metadynamics (WT-MetaD) for pathway exploration and umbrella sampling for precise free energy calculations.
  • Analysis of binding free energy and kinetic mechanisms of drug-target interactions.

Main Results:

  • The IMUS method successfully characterized the drug-target interaction process and binding free energy.
  • SR4835 selectivity was elucidated, primarily driven by differences in Hinge region H-bond stability.
  • Distinct protein-ligand interaction patterns were identified as key to selectivity.

Conclusions:

  • The study successfully elucidated the drug selectivity mechanism of SR4835 against CDK family members.
  • The findings highlight the crucial role of H-bond stability and interaction patterns in kinase inhibitor selectivity.
  • The integrated well-tempered metadynamics-umbrella sampling (IMUS) method is validated as an efficient tool for studying drug-target interactions.

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