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¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)01:20

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When proton-coupled carbon-13 spectra are simplified by a broadband proton decoupling technique, structural information about the coupled protons is lost. Distortionless enhancement by polarization transfer (DEPT) is a technique that provides information on the number of hydrogens attached to each carbon in a molecule. While the DEPT experiment utilizes complex pulse sequences, the pulse delay and flip angle are specifically manipulated. The resulting signals have different phases depending on...
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High-Resolution Mass Spectrometry (HRMS)01:15

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The resolution of a mass spectrometer depends on the efficiency of separating ions with different ion masses. The mass of an atom is approximated to the sum of the masses of protons and neutrons inside, considering the masses of protons and neutrons as equal. However, the masses of the proton (1.6726 × 10−24 g) and neutron (1.6749 × 10−24 g) are not truly equal. There is a minor error in the expression of atomic masses relative to the simplest atom of hydrogen. For...
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¹H NMR of Labile Protons: Deuterium (²H) Substitution00:48

¹H NMR of Labile Protons: Deuterium (²H) Substitution

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This lesson illustrates the role of deuterium substitution in simplifying the NMR spectrum of compounds comprising labile protons. One method employed is the use of deuterium. Amongst the three isotopes of hydrogen, deuterium (2H) has a nucleus composed of one proton and one neutron. When the D2O solvent is added to a pure dry ethanol solution, its labile proton is substituted with deuterium.
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Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

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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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Mass Analyzers: Overview01:13

Mass Analyzers: Overview

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The mass analyzer is a crucial component of the mass spectrometer. In the ionization chamber, the vaporized sample is bombarded with a high-energy electron beam to generate a radical cation and further fragment into neutral molecules, radicals, and cations. A series of negatively charged accelerator plates accelerate the cations into the mass analyzer. The mass analyzer separates ions according to their mass-to-charge (m/z) ratios and then directs them to the detector. The common types of mass...
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¹³C NMR: ¹H–¹³C Decoupling01:04

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The probability of having two carbon-13 atoms next to each other is negligible because of the low natural abundance of carbon-13. Consequently, peak splitting due to carbon-carbon spin-spin coupling is not observed in spectra. However, protons up to three sigma bonds away split the carbon signal according to the n+1 rule, resulting in complicated spectra.
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Related Experiment Video

Updated: May 30, 2025

Time-resolved ElectroSpray Ionization Hydrogen-deuterium Exchange Mass Spectrometry for Studying Protein Structure and Dynamics
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Recalibrating Protection Factors Using Millisecond Hydrogen/Deuterium Exchange Mass Spectrometry.

Michele Stofella1, Neeleema Seetaloo1,2,3, Alexander N St John1

  • 1School of Molecular and Cellular Biology and Astbury Centre, University of Leeds, Leeds LS2 9JT, U.K.

Analytical Chemistry
|January 29, 2025
PubMed
Summary
This summary is machine-generated.

Hydrogen/deuterium exchange mass spectrometry (HDX-MS) can now be a quantitative tool. New research shows trialanine peptides, not poly-dl-alanine, are better references for accurate protein dynamics measurements.

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A Hydrogen-Deuterium Exchange Mass Spectrometry HDX-MS Platform for Investigating Peptide Biosynthetic Enzymes
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Area of Science:

  • Biochemistry
  • Structural Biology
  • Analytical Chemistry

Background:

  • Hydrogen/deuterium exchange mass spectrometry (HDX-MS) is vital for studying protein structure and dynamics.
  • Current HDX-MS methods are primarily qualitative, comparing relative changes between conditions.
  • There is a need to establish HDX-MS as a quantitative technique for absolute measurements.

Purpose of the Study:

  • To re-evaluate exchange rate calculations for HDX-MS.
  • To establish HDX-MS as an absolute and quantitative measurement technique.
  • To identify suitable reference peptides for accurate deuterium uptake calculations.

Main Methods:

  • Performed millisecond HDX-MS experiments on a mixture of three unstructured peptides.
  • Compared experimental deuterium uptake curves with theoretical predictions.
  • Utilized molecular dynamics (MD) simulations to assess peptide structural propensities.
  • Reanalyzed previously published HDX-MS data.

Main Results:

  • Experimental rates agreed better with theoretical predictions using the trialanine (3-Ala) peptide than poly-dl-alanine (PDLA).
  • PDLA peptides showed significant helical propensity, making them unsuitable as unstructured references.
  • Unquantifiable salt effects necessitate further research for a universal calibration framework.

Conclusions:

  • Accurate recalibration of intrinsic exchange rate calculations is crucial for kinetic modeling in HDX-MS.
  • HDX-MS can move towards a direct link with atomistic structural models with improved calibration.
  • Trialanine peptides are proposed as more suitable references for quantitative HDX-MS.