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Exploring the conformational space of ROS1 kinase domain and the impact of allosteric mutations

Farhan Ul Haq1,2, Juliana Fatima Vilachã3, Ken Op de Beeck1,2

  • 1Center of Medical Genetics, University of Antwerp and Antwerp University Hospital, Edegem, Belgium.

Journal of Biomolecular Structure & Dynamics
|January 17, 2025
PubMed

Insights

Drug resistance in Non-Small Cell Lung Cancer (NSCLC) can arise from ROS1 mutations. This study reveals how specific mutations affect the drug binding pocket, offering insights for new drug design strategies against resistant NSCLC.

Area of Science:

  • Oncology
  • Molecular Biology
  • Drug Discovery

Background:

  • Chromosomal rearrangements, such as ROS1 fusions, are key drivers in Non-Small Cell Lung Cancer (NSCLC).
  • Multi-kinase inhibitors target ROS1 fusions, but drug resistance frequently emerges due to point mutations.
  • Allosteric mutations, located near the ATP binding pocket, contribute to resistance without directly affecting drug binding.

Purpose of the Study:

  • To investigate the resistance mechanisms conferred by L1982F and S1986F/Y mutations in ROS1.
  • To characterize the structural and dynamic changes induced by these allosteric mutations.
  • To provide insights for the rational design of next-generation inhibitors overcoming drug resistance.

Main Methods:

  • Molecular modeling and classical Molecular Dynamics (MD) simulations were employed.
  • Conformational flexibility of ROS1 variants with L1982F and S1986F/Y mutations was assessed.
  • Analysis focused on the impact of mutations on the ATP binding pocket and surrounding regions.

Main Results:

  • The L1982F and S1986F/Y mutations were found to directly alter the binding pocket volume.
  • Molecular dynamics simulations indicated significant conformational changes.
  • The G-loop region was identified as playing a crucial role in the resistance mechanism mediated by these allosteric mutations.

Conclusions:

  • Allosteric mutations L1982F and S1986F/Y in ROS1 impact drug resistance by modulating the binding pocket's conformational dynamics.
  • The G-loop is a key player in the resistance mechanism, suggesting it as a potential target for future drug development.
  • Understanding these allosteric effects is critical for designing effective therapies against resistant NSCLC.
Keywords:
L1982FROS1S1986FS1986Yallosteric mutationsmolecular dynamics

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