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Updated: Oct 2, 2025

Fully Processed Recombinant KRAS4b: Isolating and Characterizing the Farnesylated and Methylated Protein
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Insights into the Cross Talk between Effector and Allosteric Lobes of KRAS from Methyl Conformational Dynamics

Fa-An Chao1, Srisathiyanarayanan Dharmaiah1, Troy Taylor1

  • 1NCI RAS Initiative, Cancer Research Technology Program, Frederick National Laboratory for Cancer Research, Leidos Biomedical Research, Frederick, Maryland 21701, United States.

Journal of the American Chemical Society
|February 25, 2022
PubMed

Insights

Researchers studied KRAS protein dynamics using NMR to understand cancer mutations. Customized NMR techniques revealed synchronized motions influencing interactions with downstream effectors like RAF1, aiding in predicting mutant binding affinities.

Area of Science:

  • Biophysics
  • Molecular Biology
  • Cancer Research

Background:

  • KRAS is the most frequently mutated RAS protein in cancer, affecting ~20% of US cancer patients.
  • RAS protein structures and dynamics are crucial for therapeutic development but complex conformational dynamics remain challenging to study.
  • Previous studies, including 31P NMR, identified major states but missed subtle dynamics influencing effector interactions.

Purpose of the Study:

  • To systematically examine the millisecond-to-microsecond conformational dynamics of RAS proteins.
  • To investigate how these dynamics modulate interactions with downstream effectors, specifically KRAS and RAF1.
  • To develop a predictive framework for altered binding affinities of KRAS mutants based on dynamics.

Main Methods:

  • Established customized Nuclear Magnetic Resonance (NMR) relaxation dispersion techniques.
  • Applied these techniques to efficiently and systematically probe ms-micros conformational dynamics.
  • Investigated the interaction between KRAS and the Ras-binding domain of RAF1.

Main Results:

  • Observed varying synchronized motions connecting the effector and allosteric lobes in KRAS.
  • Demonstrated the critical role of KRAS conformational dynamics in controlling its interaction with RAF1.
  • Provided a dynamic basis for explaining and predicting altered binding affinities of KRAS mutants.

Conclusions:

  • Customized NMR relaxation dispersion is effective for studying KRAS conformational dynamics.
  • Conformational dynamics are key determinants of KRAS effector interactions and mutant binding affinities.
  • This work offers new insights into KRAS-mediated signaling and potential therapeutic strategies.

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