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In silico binding analysis of Withanolides with the Human GM-CSFR.

Posa Krishnamoorthy Praveen Kumar¹, Muthukumaran Sivanandham¹, Lavanya Damodharan¹

¹Department of Biotechnology, Sri Venkateswara College of Engineering, Sriperumbudur, Tamilnadu, India.

Pakistan Journal of Pharmaceutical Sciences

|July 10, 2016

Summary

Withanolide A, a compound from Withania somnifera, shows potential as an immunomodulatory drug by effectively binding to the human GM-CSFR receptor. This virtual screening identifies Withanolide A as a promising lead compound for further drug development.

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Area of Science:

Pharmacology
Immunology
Computational Chemistry

Background:

Withanolides, derived from Withania somnifera, are pharmacologically active steroidal lactones with immunomodulatory properties.
The human granulocyte-macrophage colony-stimulating factor receptor (GM-CSFR) plays a crucial role in dendritic cell function and immune responses.

Purpose of the Study:

To virtually screen Withanolides for drug-likeness using Lipinski's rule of five.
To investigate the binding interactions of Withanolides with the human GM-CSFR using molecular docking.

Main Methods:

Virtual screening of Withanolides against Lipinski's rule of five.
Molecular docking simulations to analyze binding affinity, interactions, and amino acid residues with human GM-CSFR.
Comparison of Withanolide A's binding profile with the standard immunomodulatory drug Levamisole.

Main Results:

Withanolide A demonstrated favorable drug-likeness and significant binding to the alpha subunit of human GM-CSFR.
Withanolide A exhibited a high dock score (28.07) and internal binding energy (-12.8 Kcal/mol), comparable to Levamisole.
Both Withanolide A and Levamisole interacted with the key amino acid residue ARG302 of GM-CSFR.

Conclusions:

Withanolide A is identified as a potential lead compound for developing novel immunomodulatory agents targeting GM-CSFR.
The study highlights the therapeutic potential of Withania somnifera-derived compounds in modulating immune responses.