# Molecular Docking and MD Modeling Techniques for the Development of Novel ROS1 Kinase Inhibitors

## TL;DR

This study uses computational methods to identify new compounds that could inhibit a mutated ROS1 kinase linked to cancer drug resistance.

## Contribution

The novel contribution is the identification of four new drug candidates targeting the Gly2032Arg-mutated ROS1 kinase using in silico techniques.

## Key findings

- Four molecules (PubChem CIDs 67463531, 72544946, 139431449, and 139431487) showed high docking scores and drug likeness.
- MD simulations confirmed stability and binding affinity of the top compounds with the mutated ROS1 protein.
- DFT analysis provided insights into the molecular features of the identified compounds.

## Abstract

Background: Chemotherapy is a cornerstone of cancer treatment; however, resistance to first-line chemotherapeutic agents remains a major challenge. ROS1, one of fifty-eight receptor tyrosine kinases, has been implicated in various cancer subtypes, including glioblastoma, non-small-cell lung cancer, and cholangiocarcinoma. Notably, the Gly2032Arg mutation in the ROS1 protein has been linked to resistance against the kinase inhibitor crizotinib. Objectives: Given the challenge, we conducted a comprehensive in silico study to identify new drug candidates. Methods: The study starts with modeling the Gly2032Arg-mutated ROS1 protein, followed by structure-based screening of the PubChem database. Results: Out of 1760 molecules screened, we selected the top 4 molecules (PubChem CID: 67463531, 72544946, 139431449, and 139431487) with structural features similar to crizotinib, a high docking score, and drug likeness. To further validate the effectiveness of the identified compounds, we assessed their binding affinity using the Molecular Mechanics with Generalized Born Surface Area (MM-GBSA) scoring method. To underpin the behavior and stability of protein–ligand complexes, 500 ns molecular dynamics (MD) simulations were conducted, and parameters including RMSD, RMSF, and H-bond dynamics were studied and compared. Density functional theory (DFT) at the B3LYP/6-31G* level was performed to elucidate molecular features of the identified compounds. Conclusions: Overall, this study sheds light on a new series of compounds effective against mutated targets, thereby offering a new horizon in this area.