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Biological macromolecules are organic compounds, predominantly composed of carbon atoms. The carbon atoms are covalently bonded with hydrogen, oxygen, nitrogen, and other minor elements. There are four major biological macromolecule classes: carbohydrates, lipids, proteins, and nucleic acids.
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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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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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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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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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In-cell NMR: from metabolites to macromolecules.

G Lippens1, E Cahoreau1, P Millard1

  • 1LISBP, Université de Toulouse, CNRS, INRA, INSA, Toulouse, France. Guy.Lippens@insa-toulouse.fr.

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Summary
This summary is machine-generated.

In-cell NMR is advancing structural biology by enabling direct observation of macromolecules within living cells. This technique builds upon earlier in vivo NMR studies, addressing shared challenges like sensitivity and cell viability for new biological insights.

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Area of Science:

  • Biophysics
  • Cell Biology
  • Structural Biology

Background:

  • Nuclear Magnetic Resonance (NMR) spectroscopy is increasingly used to study cellular environments.
  • Earlier efforts focused on in vivo NMR of cellular metabolites and environments.
  • Recent advancements enable in-cell NMR for macromolecular characterization.

Purpose of the Study:

  • To review the evolution and current state of in-cell NMR for macromolecules.
  • To contextualize in-cell NMR within historical in vivo NMR studies.
  • To highlight shared challenges and interdisciplinary solutions.

Main Methods:

  • Review of in-cell NMR techniques for macromolecule studies.
  • Comparison with historical in vivo NMR approaches.
  • Discussion of sensitivity, line broadening, and cell viability challenges.

Main Results:

  • In-cell NMR bridges cell biology and structural biology.
  • Shared technical challenges exist between in vivo and in-cell NMR.
  • Overcoming limitations in one area benefits the other.

Conclusions:

  • In-cell NMR offers significant potential for biomedical applications, including drug metabolism and target binding studies.
  • The field is progressing towards novel biological insights using in-cell NMR.
  • Interdisciplinary approaches are crucial for advancing in-cell NMR capabilities.