An Effective Reaction-Based Virtual Screening Method to Discover New CDK8 Ligands

Area of Science:

• Medicinal Chemistry
• Computational Drug Discovery
• Oncology

Background:

• Cyclin Dependent Kinase 8 (CDK8) is a significant drug target for cancer suppression.
• Identifying potent and selective CDK8 inhibitors is crucial for therapeutic development.

Purpose of the Study:

• To discover novel type II CDK8 ligands with high binding affinity.
• To develop and validate an effective reaction-based virtual screening strategy for drug discovery.

Main Methods:

• Pharmacophore modeling based on CDK8 crystal structures and type II ligands.
• Reaction-based virtual screening of the Scifinder database.
• Energy evaluation using fast estimation and VM2 free energy calculations.

Main Results:

• A novel series of type II CDK8 ligands were identified with competitive or superior binding free energies.
• Three identified ligands exhibited lower K_d values than a known potent reference ligand.
• Compound F demonstrated the highest potency with a K_d value of 7.5 nM, featuring favorable binding interactions.

Conclusions:

• The developed reaction-based virtual screening method is effective for discovering novel drug candidates.
• Compound F represents a promising lead compound for further preclinical development in CDK8-targeted cancer therapy.
• The findings contribute significantly to the field of CDK8 drug discovery and cancer therapeutics.