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NMR Detection Methods for Profiling RAS Nucleotide Cycling.

Ryan C Killoran1, Matthew J Smith2,3

  • 1Institute for Research in Immunology and Cancer, Université de Montréal, Montréal, QC, Canada.

Methods in Molecular Biology (Clifton, N.J.)
|May 12, 2021
PubMed
Summary
This summary is machine-generated.

Real-time NMR (RT-NMR) spectroscopy monitors RAS oncoprotein activation states. This method quantifies nucleotide exchange and GTP hydrolysis kinetics for single proteins or complex mixtures.

Keywords:
Multiplexed assaysNucleotide cyclingRAS oncoproteinsReal-time NMR spectroscopySmall GTPases

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Structural Biology

Background:

  • RAS oncoproteins are key regulators of cellular signaling pathways.
  • Their activity is controlled by nucleotide binding (GTP-bound active, GDP-bound inactive).
  • Conformational changes linked to nucleotide binding dictate effector interactions.

Purpose of the Study:

  • To detail protocols for expressing and purifying isotopically labeled RAS proteins.
  • To describe the application of real-time NMR (RT-NMR) spectroscopy for RAS analysis.
  • To enable multiplexed RT-NMR assays for monitoring multiple GTPases simultaneously.

Main Methods:

  • Expression and purification of isotopically labeled RAS proteins.
  • Real-time Nuclear Magnetic Resonance (RT-NMR) spectroscopy.
  • Kinetic assays for nucleotide exchange and GTP hydrolysis.
  • Multiplexing RT-NMR assays for small GTPase mixtures.

Main Results:

  • Established protocols for preparing high-quality, isotopically labeled RAS.
  • Demonstrated the utility of RT-NMR for measuring RAS nucleotide exchange and GTP hydrolysis kinetics.
  • Successfully applied multiplexed RT-NMR to monitor activation states of RAS protein mixtures.

Conclusions:

  • RT-NMR is a powerful tool for studying RAS oncoprotein dynamics and kinetics.
  • Multiplexed RT-NMR assays allow for simultaneous analysis of multiple small GTPases.
  • These methods facilitate a deeper understanding of RAS-mediated signaling and regulation.