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Related Concept Videos

2D NMR: Overview of Homonuclear Correlation Techniques01:16

2D NMR: Overview of Homonuclear Correlation Techniques

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Homonuclear correlation spectroscopy (COSY) is a powerful technique used in Nuclear Magnetic Resonance (NMR) spectroscopy to study the correlations between nuclei of the same type within a molecule. It provides information about scalar couplings between adjacent nuclei, which helps determine connectivity and structural information. There are several COSY variants, each with its unique strengths and experimental parameters.
COSY90 is the standard two-dimensional (2D) COSY experiment that...
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Double Resonance Techniques: Overview01:12

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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.
Spin decoupling is usually achieved by...
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Chemical Shift: Internal References and Solvent Effects01:17

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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.
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¹H NMR: Complex Splitting01:13

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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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2D NMR: Overview of Heteronuclear Correlation Techniques01:18

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Heteronuclear correlation spectroscopy is an analytical technique that investigates the coupling between different types of nuclei, often a proton and an X-nucleus, such as carbon-13 or nitrogen-15. This method is commonly used in nuclear magnetic resonance (NMR) spectroscopy to gain insights into complex chemical compounds' structural and compositional aspects. A typical heteronuclear correlation spectrum displays X-nucleus chemical shifts on one axis and a proton spectrum on the other...
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¹H NMR: Long-Range Coupling01:27

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The coupling interactions of nuclei across four or more bonds are usually weak, with J values less than 1 Hz. While these are usually not observed in spectra, the presence of multiple bonds along the coupling pathway can result in observable long-range coupling.
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Atomic Scale Structural Studies of Macromolecular Assemblies by Solid-state Nuclear Magnetic Resonance Spectroscopy
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Sequential backbone assignment based on dipolar amide-to-amide correlation experiments.

ShengQi Xiang1, Kristof Grohe, Petra Rovó

  • 1Department for NMR-Based Structural Biology, Max Planck Institute for Biophysical Chemistry, Göttingen, Germany.

Journal of Biomolecular NMR
|May 16, 2015
PubMed
Summary
This summary is machine-generated.

Solid-state NMR now uses protons for better protein structure and dynamics insights. Amide-to-amide correlations offer a new, reliable method for unambiguous backbone assignment in proteins.

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Area of Science:

  • Biophysical Chemistry
  • Structural Biology
  • Nuclear Magnetic Resonance (NMR) Spectroscopy

Background:

  • Proton detection in solid-state NMR is increasingly popular for structural and dynamic studies.
  • New techniques leverage protons for enhanced information on protein structure and interactions.
  • Improved sensitivity and reduced assignment ambiguity are key benefits of proton-based NMR.

Purpose of the Study:

  • To evaluate sequential amide-to-amide correlations as a method for unambiguous backbone assignment in solid-state NMR.
  • To compare the efficacy of amide-to-amide experiments with established carbon-13 (13C) shift-based methods.
  • To demonstrate the feasibility of this approach using efficient cross-polarization (CP) magnetization transfers.

Main Methods:

  • Solid-state Nuclear Magnetic Resonance (NMR) spectroscopy.
  • Development and application of sequential amide-to-amide correlation experiments.
  • Comparison with traditional 13C-shift-based assignment strategies.
  • Utilizing efficient cross-polarization (CP) magnetization transfers.

Main Results:

  • Sequential amide-to-amide correlations provide an excellent complementary method for backbone assignment.
  • This approach effectively utilizes amide chemical shifts for unambiguous assignments.
  • The method demonstrates high feasibility in solid-state NMR applications.
  • CP magnetization transfers proved more efficient than INEPT periods for this purpose.

Conclusions:

  • Sequential amide-to-amide correlations are a powerful tool for solid-state NMR.
  • This technique enhances unambiguous backbone assignment in proteins.
  • The method is highly feasible and complements existing NMR strategies.