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¹H NMR: Complex Splitting01:13

¹H NMR: Complex Splitting

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A proton M that is coupled to a proton X results in doublet signals for M. However, NMR-active nuclei can be simultaneously coupled to more than one nonequivalent nucleus. When M is coupled to a second proton A, such as in styrene oxide, each peak in the doublet is split into another doublet.
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Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
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¹H NMR: Interpreting Distorted and Overlapping Signals01:02

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Spin systems where the difference in chemical shifts of the coupled nuclei is greater than ten times J are called first-order spin systems. These nuclei are weakly coupled, and their chemical shifts and coupling constant can generally be estimated from the well-separated signals in the spectrum.
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Applications Of NMR In Biology01:25

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Nuclear magnetic resonance (NMR) spectroscopy is a very valuable analytical technique for researchers. It has been used for more than 50 years as an analytical tool. F. Bloch and E. Purcell formulated NMR in 1946 and won the 1952 Nobel Prize in Physics  for their work. Biological macromolecules such as proteins, nucleic acids, lipids, and organic molecules including pharmaceutical compounds, can be studied using this versatile tool that exploits the magnetic properties of certain nuclei.
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¹H NMR of Conformationally Flexible Molecules: Temporal Resolution00:52

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At room temperature, the chair conformer of cyclohexane undergoes rapid ring flipping between two equivalent chair conformers at a rate of approximately 105 times per second. These two chair conformers are in equilibrium. The rapid ring flipping results in the interconversion of the axial proton to an equatorial proton and an equatorial to the axial proton. Such interconversions are too rapid and cannot be detected on the NMR timescale. Hence, the NMR spectrometer cannot distinguish between the...
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In the AX proton spin system, proton A can sense the two spin states of a coupled proton X, resulting in a doublet NMR signal with two peaks of equal (1:1) intensity. When proton A is coupled to two equivalent protons (AX2 spin system), the spin states of each X can be aligned with or against the external field, creating three possible scenarios. This results in a 1:2:1  triplet signal, where the central peak corresponds to the chemical shift of A and is twice as large or intense as the...
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Profiling Complex RAS-Effector Interactions Using NMR Spectroscopy.

Regina Strakhova1, Matthew J Smith2,3

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

Methods in Molecular Biology (Clifton, N.J.)
|April 3, 2024
PubMed
Summary
This summary is machine-generated.

This study introduces a new NMR method to quantify how multiple proteins compete for binding to RAS GTPases. This technique enhances our understanding of complex cellular signaling pathways and RAS-related diseases.

Keywords:
CompetitionEffector bindingNMR spectroscopyPLCε-1RAFRAS GTPasesRBD domain

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Cell Signaling

Background:

  • RAS GTPases are crucial molecular switches regulating cellular functions.
  • RAS effector interactions are vital for normal development and tumorigenesis.
  • Multiple effectors often compete for activated RAS, suggesting complex signaling dynamics.

Purpose of the Study:

  • To develop and validate a novel NMR-based method for quantifying competitive effector binding to RAS GTPases.
  • To provide a more physiologically relevant in vitro system for studying RAS signaling.

Main Methods:

  • Utilized Nuclear Magnetic Resonance (NMR) spectroscopy.
  • Developed a competition assay using isotopically labeled wild-type KRAS and unlabeled RAS association (RA) or RAS binding domains (RBDs) of competing effectors (ARAF, PLCε1).
  • Quantified binding by measuring peak intensities at characteristic chemical shifts.

Main Results:

  • Successfully demonstrated a method to directly quantitate GTPase binding to competing effectors.
  • The assay allows for simultaneous assessment of multiple interactions.
  • Applicable to studying competition with small molecules, GEF/GAP domains, and regulatory enzymes.

Conclusions:

  • The developed NMR method offers a powerful approach to study multiplex RAS effector interactions.
  • This technique advances biophysical and systems-level understanding of RAS signaling in a more integrated manner.
  • Brings in vitro assays closer to complex cellular environments, aiding research in RAS-driven diseases.