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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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The axial and equatorial protons in cyclohexane can be distinguished by performing a variable-temperature NMR experiment. In this process, except for one proton, the remaining eleven protons are replaced by deuterium. The deuterium substitution avoids the possible peak splitting caused by the spin-spin coupling between the adjacent protons. The remaining proton flips between the axial and equatorial positions.
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Applications Of NMR In Biology01:25

Applications Of NMR In Biology

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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: Pople Notation01:09

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The Pople nomenclature system classifies spin systems based on the difference between their chemical shifts. Coupled spins are denoted by capital letters with subscripts indicating the number of equivalent nuclei. When the coupled nuclei have well-separated chemical shifts, they are assigned letters that are far apart in the alphabet, such as A and X. When the difference in chemical shifts is small, coupled nuclei are named using adjacent letters of the alphabet (AB, MN, or XY).
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In proton NMR spectroscopy, primary amines and secondary amines showcase their N–H protons as a broad signal in the chemical shift range between δ 0.5 and 5 ppm. The exact position in this range depends on several factors, including sample concentration, hydrogen bonding, and the type of solvent used. Since amine protons undergo fast proton exchange in solution, the protons are labile and therefore do not participate in any splitting with adjacent protons. Thus, the observed peak is...
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NMR spectrometers consist of a strong magnet, a radiofrequency transmitter, and a detector attached to a computer console for recording spectra of samples containing NMR-active nuclei. In first-generation NMR instruments called continuous-wave spectrometers, the resonance frequencies of the nuclei are determined by frequency-sweep or field-sweep methods. The magnetic field strength is fixed and the rf signal is swept in the former, while the radiofrequency signal is fixed and the magnetic field...
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Protein NMR: Boundless opportunities.

Ad Bax1, G Marius Clore1

  • 1Laboratory of Chemical Physics, NIDDK, National Institutes of Health, Bethesda, MD 20892-0520, USA.

Journal of Magnetic Resonance (San Diego, Calif. : 1997)
|July 18, 2019
PubMed
Summary
This summary is machine-generated.

Isotope-directed Nuclear Magnetic Resonance (NMR) spectroscopy reveals transient states in biological molecules. This powerful technique offers dynamic insights crucial for understanding molecular interactions and functions.

Keywords:
Conformational exchangeDynamicsHeteronuclear NMRMegadalton assembliesSparsely-populated excited statesStructureSupramolecular machines

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Area of Science:

  • Biophysical Chemistry
  • Structural Biology
  • Molecular Biophysics

Background:

  • Nuclear Magnetic Resonance (NMR) spectroscopy is a key technique for determining 3D structures of biological macromolecules in solution.
  • NMR is particularly valuable for studying systems intractable to crystallization, such as intrinsically disordered proteins and weak complexes.

Purpose of the Study:

  • To highlight the capabilities of isotope-directed NMR spectroscopy in structural biology.
  • To emphasize NMR's unique ability to probe dynamic processes and transient states in biological systems.

Main Methods:

  • Utilizes isotope-directed NMR spectroscopy.
  • Leverages solution-state structural biology techniques.

Main Results:

  • NMR provides a dynamic view of biological macromolecules, contrasting with static structural methods like X-ray crystallography and cryo-electron microscopy.
  • NMR can quantitatively characterize exchange dynamics between states and identify transient states populated at low levels (≥1%).

Conclusions:

  • Transient "excited" states are critical for macromolecular recognition, allostery, signal transduction, and assembly.
  • A strong understanding of NMR's physical principles is essential for advancing its application in studying complex biological systems.