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Understanding the Kinetic Mechanism of Ligands Stabilizing the RAS-CYPA Interaction.

Kexin Xu1, Mingyun Shen2, Zhe Wang3,4

  • 1Department of Medicinal Chemistry, China Pharmaceutical University, Nanjing, Jiangsu 210009, P. R. China.

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|January 22, 2026
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Summary
This summary is machine-generated.

Molecular glues stabilize protein-protein interactions (PPIs), offering new drug design avenues. This study reveals how RMC7977 stabilizes KRAS-CYPA interactions, providing a computational framework for targeting challenging PPIs.

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Area of Science:

  • Biochemistry
  • Computational Chemistry
  • Drug Design

Background:

  • Molecular glues are a novel drug design paradigm targeting biomacromolecular interactions.
  • KRAS oncogenic driver is challenging to target due to its binding surface and mutations.
  • Understanding the mechanism of protein-protein interaction (PPI) stabilizers like RMC7977 is crucial.

Purpose of the Study:

  • To elucidate the molecular mechanism of RMC7977 as a PPI stabilizer for the KRAS-CYPA interaction.
  • To investigate the dynamic characteristics of RAS-ligand-CYPA interactions using computational methods.
  • To provide a computational framework for evaluating PPI stabilizers.

Main Methods:

  • Integrated computational strategy combining molecular dynamics (MD) simulation.
  • End-point binding free-energy calculation.
  • Enhanced sampling technologies to study dynamic characteristics.

Main Results:

  • RMC7977 acts as a strong PPI stabilizer, significantly enhancing KRAS-CYPA interaction stability.
  • The drug optimizes interactions by remodeling the protein-protein interface.
  • Computational predictions showed high correlation with experimental observations, uncovering stabilization dynamics and selectivity origins.

Conclusions:

  • The study provides molecular-level insights into RMC7977's function as a KRAS-CYPA PPI stabilizer.
  • The computational framework is valuable for evaluating ligands targeting challenging PPI systems.
  • This work advances the rational design of molecular glues for drug discovery.