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Related Concept Videos

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.
The internal reference compound generally used in NMR spectroscopy is tetramethylsilane (TMS). TMS is preferred because it is chemically inert, soluble in NMR solvents, and easily removable. Also, the highly shielded methyl protons in TMS yield an intense...
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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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Atomic Scale Structural Studies of Macromolecular Assemblies by Solid-state Nuclear Magnetic Resonance Spectroscopy
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Solid-state NMR and membrane proteins.

Stanley J Opella1

  • 1Department of Chemistry and Biochemistry, University of California, San Diego, La Jolla, CA 92093, USA.

Journal of Magnetic Resonance (San Diego, Calif. : 1997)
|February 16, 2015
PubMed
Summary
This summary is machine-generated.

Solid-state Nuclear Magnetic Resonance (NMR) enables high-resolution membrane protein structure determination within phospholipid bilayers. This technique is crucial for understanding proteins in their near-native environments.

Keywords:
BilayersChemical shift anisotropyDipolar couplingMagic angle spinningPhospholipidsStructure determination

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Area of Science:

  • Biophysical Chemistry
  • Structural Biology
  • Biochemistry

Background:

  • Membrane proteins function within phospholipid bilayers, their native environment.
  • Protein dynamics within bilayers immobilize them on NMR timescales.
  • High-resolution structural data is essential for understanding membrane protein function.

Purpose of the Study:

  • To highlight the necessity of solid-state NMR for membrane protein structure determination.
  • To discuss the foundational principles of solid-state NMR applicable to membrane proteins.
  • To showcase the advancement of solid-state NMR for near-native structural analysis.

Main Methods:

  • Utilizes solid-state Nuclear Magnetic Resonance (NMR) spectroscopy.
  • Employs techniques for both unoriented and oriented membrane protein samples.
  • Leverages fundamental NMR interactions: chemical shift and dipole-dipole couplings.

Main Results:

  • Solid-state NMR provides high-resolution spectra essential for structural analysis.
  • Developed approaches allow for the study of membrane proteins in phospholipid bilayers.
  • Structural determination under near-native conditions is achievable.

Conclusions:

  • Solid-state NMR is an indispensable tool for elucidating membrane protein structures.
  • Advancements in solid-state NMR enable near-native structural studies.
  • Understanding membrane protein structure is critical for biological and pharmaceutical research.