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Theoretically exploring selective-binding mechanisms of BRD4 through integrative computational approaches

D Luo1,2, J B Tong1,2, X C Xiao1,2

  • 1College of Chemistry and Chemical Engineering, Shaanxi University of Science and Technology, Xi'an, China.

SAR and QSAR in Environmental Research
|November 30, 2021
PubMed

Insights

Researchers developed novel tetrahydropteridin analogues as Bromodomain-containing protein 4 (BRD4) inhibitors for cancer therapy. Molecular docking revealed new binding poses and highlighted hydrophobic interactions as key for enhanced anti-cancer activity.

Area of Science:

  • Medicinal Chemistry
  • Molecular Biology
  • Computational Chemistry

Background:

  • Cancer arises from dysregulated signaling pathways and physiological processes.
  • Bromodomain-containing protein 4 (BRD4) epigenetically regulates growth-promoting genes, making it a target for anticancer agents.
  • Novel BRD4 inhibitors show potential against drug resistance, but their binding mechanisms require elucidation.

Purpose of the Study:

  • To construct quantitative structure-activity relationship (QSAR) models for tetrahydropteridin analogues targeting BRD4.
  • To design and investigate novel tetrahydropteridin analogues with improved binding modes and inhibitory mechanisms.
  • To elucidate the key interactions driving the binding of these inhibitors to BRD4.

Main Methods:

  • Quantitative Structure-Activity Relationship (QSAR) modeling using topomer CoMFA and HQSAR.
  • Molecular docking studies to predict binding poses and interactions.
  • Molecular Dynamics (MD) simulations and free energy calculations to analyze binding stability and contributions.

Main Results:

  • Robust QSAR models were established for 68 tetrahydropteridin analogues.
  • Novel tetrahydropteridin analogues were designed based on QSAR insights.
  • Molecular docking revealed a new binding pose involving specific amino acid residues (Trp81, Pro82, Val87, Leu92, Leu94, Cys136, Asp144, Ile146) and highlighted hydrophobic interactions as crucial for binding affinity.

Conclusions:

  • The study provides novel insights into the binding mechanisms of BRD4 inhibitors.
  • Hydrophobic interactions are identified as critical determinants of inhibitor binding to BRD4.
  • The findings can guide the rational design of potent BRD4 inhibitors for enhanced anti-cancer drug discovery.
Keywords:
BRD4MM-PBSAQSARmolecular dockingmolecular dynamics simulations

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