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Related Concept Videos

¹H NMR of Labile Protons: Deuterium (²H) Substitution00:48

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

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

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

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...
¹³C NMR: ¹H–¹³C Decoupling01:04

¹³C NMR: ¹H–¹³C Decoupling

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.
A broadband decoupling technique is used to simplify these complex, sometimes overlapping, signals. Broadband decoupling relies on a...
Chemical Shift: Internal References and Solvent Effects01:17

Chemical Shift: Internal References and Solvent Effects

In an NMR sample, precise measurement of the absolute absorption frequencies of nuclei is difficult. A standard internal reference compound is added, and the frequency difference between the reference signal and sample signals is measured.
The internal reference compound generally used in NMR spectroscopy is tetramethylsilane (TMS). TMS is preferred because it is chemically inert, soluble in NMR solvents, and easily removable. Also, the highly shielded methyl protons in TMS yield an intense...
Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

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.
Spin decoupling is usually achieved by...
¹H NMR: Complex Splitting01:13

¹H NMR: Complex Splitting

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.
Splitting diagrams or splitting tree diagrams are routinely used to depict such complex couplings. While drawing splitting diagrams, the splitting with the larger coupling constant is usually applied first.

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Neutron Crystallography Data Collection and Processing for Modelling Hydrogen Atoms in Protein Structures
10:10

Neutron Crystallography Data Collection and Processing for Modelling Hydrogen Atoms in Protein Structures

Published on: December 1, 2020

Deuterium labeling for neutron structure-function-dynamics analysis.

Flora Meilleur1, Kevin L Weiss, Dean A A Myles

  • 1Department of Molecular & Structural Biochemistry, North Carolina State University, Oak Ridge National Laboratory, Raleigh, Oak Ridge, NC, TN, USA.

Methods in Molecular Biology (Clifton, N.J.)
|June 3, 2009
PubMed
Summary
This summary is machine-generated.

Neutron scattering reveals biological structures and dynamics using deuterium labeling. This technique enhances data quality and allows detailed analysis of complex biological systems.

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Area of Science:

  • Biophysics
  • Structural Biology
  • Biochemistry

Background:

  • Neutron scattering and diffraction offer insights into biological material structure and dynamics.
  • Neutron sensitivity to hydrogen isotopes necessitates deuterium labeling for optimal experiments.
  • Deuterium labeling is crucial for enhancing signal-to-noise and visibility in neutron scattering studies.

Purpose of the Study:

  • To highlight the utility of deuterium labeling in neutron scattering experiments.
  • To demonstrate how deuterium labeling aids in structural and dynamic analysis of biological systems.
  • To explain the methods for producing and analyzing deuterated biological samples.

Main Methods:

  • Utilizing neutron scattering and diffraction techniques.
  • Employing selective deuterium labeling of biological systems, including proteins.
  • Producing deuterated proteins via endogenous expression in adapted bacterial systems.
  • Analyzing deuteration levels using mass spectrometry.

Main Results:

  • Fully deuterated protein crystals improve data signal-to-noise by an order of magnitude.
  • Deuterium labeling enables deconvolution of scattering from complex assemblies and determination of subunit disposition.
  • Selective labeling allows reconstruction of subunit locations in higher-order complexes.
  • Site-specific labeling highlights specific dynamics in inelastic neutron scattering experiments.

Conclusions:

  • Deuterium labeling is an essential tool for maximizing information from neutron scattering.
  • This technique significantly enhances structural and dynamic studies of biological materials.
  • Methods for producing and analyzing deuterated proteins are established and effective.