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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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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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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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Applications Of NMR In Biology01:25

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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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Other Nuclides: 31P, 19F, 15N NMR01:16

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Many organic, inorganic, and biological molecules contain spin-half nuclei such as nitrogen-15, fluorine-19, and phosphorus-31. As a result, NMR studies of these nuclei have found extensive applications in chemical and biological research.
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Optimal isotope labelling for NMR protein structure determinations.

Masatsune Kainosho1, Takuya Torizawa, Yuki Iwashita

  • 1CREST/JST and Graduate School of Science, Tokyo Metropolitan University, 1-1 Minami-ohsawa, Hachioji, 192-0397, Japan. kainosho@nmr.chem.metro-u.ac.jp

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Stereo-array isotope labelling (SAIL) enhances nuclear-magnetic-resonance (NMR) spectroscopy for protein structure determination. This technique improves spectral quality, enabling high-resolution analysis of larger proteins previously inaccessible by NMR.

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Area of Science:

  • Biochemistry
  • Structural Biology
  • Spectroscopy

Background:

  • Nuclear-magnetic-resonance (NMR) spectroscopy is crucial for determining protein 3D structures in solution.
  • Interpreting NMR spectra is challenging due to broadened lines, overlapping resonances, and low signal-to-noise ratios.

Purpose of the Study:

  • To introduce Stereo-Array Isotope Labelling (SAIL) as a novel technique to overcome NMR spectral limitations.
  • To enhance the quality and information content of NMR spectra for protein structure determination.

Main Methods:

  • SAIL employs a complete stereospecific and regiospecific stable isotope labeling pattern.
  • Utilizes chemically and enzymatically synthesized amino acids for cell-free protein expression.
  • Applies the SAIL technique to proteins like calmodulin (17 kDa) and maltodextrin-binding protein (41 kDa).

Main Results:

  • SAIL significantly sharpens spectral lines and simplifies spectra without information loss.
  • Enables rapid collection of structural restraints for high-quality solution structures.
  • Demonstrates the ability to solve structures for proteins twice the size typically manageable by NMR.

Conclusions:

  • SAIL overcomes major challenges in NMR-based protein structure determination.
  • Expands the scope of NMR spectroscopy to a larger class of proteins.
  • Facilitates detailed solution structure determination for previously inaccessible protein targets.