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Determining KRAS4B-Targeting Compound Specificity by Top-Down Mass Spectrometry.

Robert A D'Ippolito1, Grace M Scheidemantle1, Dana Rabara1

  • 1NCI RAS Initiative, Frederick National Laboratory for Cancer Research, Frederick, MD, USA.

Methods in Molecular Biology (Clifton, N.J.)
|July 25, 2024
PubMed
Summary

We developed a new method using mass spectrometry to precisely map where KRAS4B-targeting drugs bind. This technique enhances the identification of specific and effective KRAS4B inhibitors.

Keywords:
Covalent modificationsKRAS4BOncogenic mutationsProteoformTargeted MS2 fragmentationTop–down mass spectrometry

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Area of Science:

  • Biochemistry
  • Analytical Chemistry
  • Pharmacology

Background:

  • KRAS4B is a key target in cancer therapy.
  • Developing specific inhibitors for KRAS4B is challenging.
  • Existing methods for assessing drug engagement lack precision.

Purpose of the Study:

  • To introduce a novel top-down mass spectrometry (MS) method for characterizing KRAS4B-compound interactions.
  • To directly assess the specificity and engagement of KRAS4B-targeting compounds in vitro.
  • To provide a detailed protocol for implementing this advanced MS technique.

Main Methods:

  • Utilizing top-down mass spectrometry (MS) to analyze intact KRAS4B proteoforms.
  • Employing targeted MS2 fragmentation to localize compound binding sites on specific proteoforms.
  • Analyzing compound-treated samples to characterize KRAS4B species and binding events.

Main Results:

  • Direct visualization and characterization of KRAS4B proteoforms in the presence of compounds.
  • Precise localization of compound binding to specific residues on KRAS4B.
  • Demonstration of concentration-dependent KRAS4B-compound engagement and specificity.
  • Clear detection of nonspecific binding events and their frequency.

Conclusions:

  • Top-down MS offers a powerful approach to map drug binding locations without altering protein structure.
  • This method can accelerate the discovery of targeted inhibitors for KRAS4B and other RAS isoforms.
  • The developed protocol provides a reproducible framework for evaluating drug-target interactions.