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Related Concept Videos

Insensitive Nuclei Enhanced by Polarization Transfer (INEPT)01:15

Insensitive Nuclei Enhanced by Polarization Transfer (INEPT)

Insensitive Nuclei Enhanced by Polarization Transfer (INEPT) is an advanced Nuclear Magnetic Resonance (NMR) technique specifically designed to detect and enhance the signals of low-abundance nuclei, such as carbon-13 and nitrogen-15, in small molecules. The fundamental principle behind INEPT is the transfer of polarization from a more abundant and highly polarizable nucleus, typically hydrogen-1, to the low-abundance nucleus of interest. This process effectively boosts the NMR signal of the...
Other Nuclides: 31P, 19F, 15N NMR01:16

Other Nuclides: 31P, 19F, 15N NMR

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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Applications Of NMR In Biology01:25

Applications Of NMR In Biology

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.
The...
¹H NMR: Pople Notation01:09

¹H NMR: Pople Notation

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).
A proton...
Atomic Nuclei: Magnetic Resonance01:05

Atomic Nuclei: Magnetic Resonance

The number of nuclear spins aligned in the lower energy state is slightly greater than those in the higher energy state. In the presence of an external magnetic field, as the spins precess at the Larmor frequency, the excess population results in a net magnetization oriented along the z axis. When a pulse or a short burst of radio waves at the Larmor frequency is applied along the x axis, the coupling of frequencies causes resonance and flips the nuclear spins of the excess population from the...
Paramagnetism01:30

Paramagnetism

Paramagnets are materials with unpaired electrons that possess a finite magnetic moment. In the absence of a magnetic field, these moments are randomly oriented, and thus the net moment is zero. Under an external field, a torque acting on the moments tends to align them along the field's direction. However, the random thermal motion of electrons produces a torque opposite to the external field and tries to disorient the moments. These two competing effects align only a few moments along the...

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Paramagnetic Relaxation Enhancement for Detecting and Characterizing Self-Associations of Intrinsically Disordered Proteins
07:24

Paramagnetic Relaxation Enhancement for Detecting and Characterizing Self-Associations of Intrinsically Disordered Proteins

Published on: September 23, 2021

Protein NMR using paramagnetic ions.

Gottfried Otting1

  • 1Australian National University, Research School of Chemistry, Canberra, ACT 0200, Australia. gottfried.otting@anu.edu.au

Annual Review of Biophysics
|May 14, 2010
PubMed
Summary
This summary is machine-generated.

Paramagnetic metal ions enhance nuclear magnetic resonance (NMR) spectroscopy for protein studies. New labeling methods make these powerful tools accessible for non-metalloproteins, aiding structural and interaction analyses.

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Area of Science:

  • Biochemistry
  • Structural Biology
  • Spectroscopy

Background:

  • Paramagnetic metal ions are valuable tools in nuclear magnetic resonance (NMR) spectroscopy.
  • Paramagnetic effects provide crucial data for protein structure determination and interaction analysis.
  • Site-specific labeling techniques are expanding the utility of paramagnetic ions.

Purpose of the Study:

  • To highlight the opportunities offered by paramagnetic metal ions in protein NMR studies.
  • To discuss the applications of paramagnetic effects in structural biology and interaction analysis.
  • To emphasize the impact of new labeling reagents on NMR spectroscopy of non-metalloproteins.

Main Methods:

  • Utilizing paramagnetic metal ions for NMR spectroscopy.
  • Applying paramagnetic effects for structural restraints.
  • Employing site-specific protein labeling strategies.

Main Results:

  • Paramagnetic effects in NMR spectra yield powerful restraints for protein 3D structure determination.
  • These effects facilitate the analysis of protein-protein and protein-ligand interactions.
  • Paramagnetic labeling enhances NMR experiment sensitivity and aids resonance assignments and conformational studies.

Conclusions:

  • Paramagnetic metal ions significantly advance protein NMR studies.
  • New labeling reagents broaden the application of paramagnetic NMR to non-metalloproteins.
  • This approach offers versatile tools for comprehensive protein analysis.