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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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The 1D NMR spectrum of large and complex molecules like natural products has complicated splitting patterns and overlapping signals, which can be easily interpreted using 2-dimensional (2D) NMR. Unlike 1D NMR, 2D NMR has two frequency axes that provide the coupling information between the nucleus A and nucleus B in a molecule. The process from which 2D spectra are obtained has four steps.
The first step is the preparation period, during which nucleus A is excited with a radiofrequency pulse....
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2D NMR: Overview of Homonuclear Correlation Techniques01:16

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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.
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When magnetic nuclei in a sample achieve resonance and undergo relaxation, the signal detected in NMR is an approximately exponential free induction decay. Fourier transform of an exponential decay yields a Lorentzian peak in the frequency domain. Lorentzian peaks in an NMR spectrum are defined by their amplitude, full width at half maximum, and position, where the peak width is governed by the spin-spin relaxation time alone. In real experiments, however, the applied magnetic field is rendered...
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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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Heteronuclear single-quantum correlation spectroscopy (HSQC) is a 2D NMR technique that reveals one-bond correlations between hydrogen and a heteronucleus. The HSQC experiment is similar to the heteronuclear correlation experiment (HETCOR) but is more sensitive. In the HSQC spectrum, the proton chemical shift is plotted on the horizontal F2 axis, while the 13C chemical shift is plotted on the vertical F1 axis. The corresponding proton and 13C spectra are also shown. The HSQC contour plot does...
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Absolute Minimal Sampling in High-Dimensional NMR Spectroscopy.

Alexandar L Hansen1, Rafael Brüschweiler2,3,4

  • 1Campus Chemical Instrument Center, The Ohio State University, 460 W. 12th Avenue, Columbus, OH, 43210, USA.

Angewandte Chemie (International Ed. in English)
|October 11, 2016
PubMed
Summary
This summary is machine-generated.

This study introduces an absolute minimal sampling (AMS) method to accelerate nuclear magnetic resonance (NMR) experiments. AMS significantly reduces measurement times for 3D NMR, enabling faster analysis of molecular systems.

Keywords:
NMR spectroscopyminimal samplingnon-linear least-squares time-domain fittingprotein structures

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Area of Science:

  • Structural Biology
  • Biophysics
  • Nuclear Magnetic Resonance (NMR) Spectroscopy

Background:

  • Standard three-dimensional Fourier transform (FT) NMR experiments require extensive sampling, leading to prolonged measurement times.
  • This bottleneck hinders the rapid analysis of molecular systems.
  • Existing alternative sampling methods often suffer from algorithmic complexity, making it difficult to determine optimal sampling strategies.

Purpose of the Study:

  • To introduce a novel Absolute Minimal Sampling (AMS) method for common 3D NMR experiments.
  • To determine the minimal sampling requirements for achieving adequate spectral resolution.
  • To maximize experimental speed-up in NMR spectroscopy.

Main Methods:

  • Development and application of the Absolute Minimal Sampling (AMS) method.
  • Testing AMS on standard 3D NMR experiments for proteins ubiquitin and arginine kinase.
  • Analysis of spectral resolution and accuracy with reduced sampling.

Main Results:

  • Accurate carbon frequencies were obtained for 3D HNCO experiments with a single time increment.
  • Essential information for 3D HN(CA)CO experiments was acquired using only 6 time increments.
  • Achieved experimental speed-up factors ranging from 7 to 50 for common 3D NMR experiments.

Conclusions:

  • The Absolute Minimal Sampling (AMS) method significantly accelerates 3D NMR experiments.
  • AMS provides a straightforward approach to determine minimal sampling requirements, enhancing experimental efficiency.
  • This method offers a substantial speed-up for analyzing protein structures and dynamics.