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Related Concept Videos

Nuclear Overhauser Enhancement (NOE)01:07

Nuclear Overhauser Enhancement (NOE)

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Irradiation of a spin-active nucleus causes an increase or decrease in the signal intensity of neighboring nuclei that are not necessarily chemically bonded or involved in J-coupling.  This phenomenon, called the Nuclear Overhauser Enhancement (NOE), results from through-space interactions between the nuclear spins. The NOE effect decreases with increasing internuclear distance and is generally not observed beyond 4 angstroms. In NOE, dipole-dipole interactions between neighboring...
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Atomic Nuclei: Nuclear Relaxation Processes01:23

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In the absence of an external magnetic field, nuclear spin states are degenerate and randomly oriented. When a magnetic field is applied, the spins begin to precess and orient themselves along (lower energy) or against (higher energy) the direction of the field. At equilibrium, a slight excess population of spins exists in the lower energy state. Because the direction of the magnetic field is fixed as the z-axis,  the precessing magnetic moments are randomly oriented around the z-axis.
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Atomic Nuclei: Nuclear Spin State Population Distribution01:14

Atomic Nuclei: Nuclear Spin State Population Distribution

1.1K
Near absolute zero temperatures, in the presence of a magnetic field, the majority of nuclei prefer the lower energy spin-up state to the higher energy spin-down state. As temperatures increase, the energy from thermal collisions distributes the spins more equally between the two states. The Boltzmann distribution equation gives the ratio of the number of spins predicted in the spin −½ (N−) and spin +½ (N+) states.
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Atomic Nuclei: Types of Nuclear Relaxation01:28

Atomic Nuclei: Types of Nuclear Relaxation

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Nuclear relaxation restores the equilibrium population imbalance and can occur via spin–lattice or spin–spin mechanisms, which are first-order exponential decay processes.
In spin–lattice or longitudinal relaxation, the excited spins exchange energy with the surrounding lattice as they return to the lower energy level. Among several mechanisms that contribute to spin–lattice relaxation, magnetic dipolar interactions are significant. Here, the excited nucleus transfers...
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Atomic Nuclei: Nuclear Spin State Overview01:03

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NMR-active nuclei have energy levels called 'spin states' that are associated with the orientations of their nuclear magnetic moments. In the absence of a magnetic field, the nuclear magnetic moments are randomly oriented, and the spin states are degenerate. When an external magnetic field is applied, the spin states have only 2 + 1 orientations available to them. A proton with = ½ has two available orientations. Similarly, for a quadrupolar nucleus with a nuclear spin value of...
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Directionality of Nuclear Transport01:42

Directionality of Nuclear Transport

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Ras-related nuclear protein or Ran is a small G protein that cycles between its GTP and GDP bound states. Ran specific regulators, a Ran GTPase Activating Protein or RanGAP present in the cytosol and a Ran guanine nucleotide exchange factor or RanGEF present inside the nucleus regulate GTP/GDP exchange. A high concentration of GTP inside the cells, in addition to this asymmetric distribution of  Ran-specific regulators, leads to a higher RanGTP concentration inside the nucleus. This...
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Advances in the exact nuclear Overhauser effect 2018-2022.

Alya Hussain1, Natasia Paukovich1, Morkos A Henen2

  • 1Department of Biochemistry & Molecular Genetics, School of Medicine, University of Colorado, 12801 E. 17(th) Avenue, Aurora, CO 80045, USA.

Methods (San Diego, Calif.)
|August 19, 2022
PubMed
Summary

Exact nuclear Overhauser enhancement (eNOE) in NMR offers precise distance restraints for higher resolution macromolecular structures. Recent innovations enhance its application in protein, RNA, and DNA structure elucidation.

Keywords:
Exact NOENuclear Magnetic ResonanceNuclear Overhauser EffecteNOE

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Area of Science:

  • Biophysical Chemistry
  • Structural Biology
  • Nuclear Magnetic Resonance Spectroscopy

Background:

  • Nuclear magnetic resonance (NMR) spectroscopy is a powerful tool for determining the three-dimensional structures of biomolecules.
  • Nuclear Overhauser effect (NOE) experiments provide distance restraints crucial for structure calculations.
  • Conventional NOE analysis has limitations in accuracy and resolution.

Purpose of the Study:

  • To review technical advancements and biological applications of the exact nuclear Overhauser enhancement (eNOE) methodology in NMR spectroscopy.
  • To highlight the period of 2018-2022, focusing on innovations and major applications of eNOE.
  • To cover the use of eNOE in elucidating the structure of proteins, RNA, and DNA.

Main Methods:

  • Implementation of non-uniform sampling for NOESY (Nuclear Overhauser Effect SpectroscopY) buildup experiments.
  • Development and application of novel pulse sequences for enhanced eNOE measurements.
  • Adaptation of eNOE techniques to solid-state NMR spectroscopy.
  • Advances in data analysis methods for eNOE spectra.
  • Innovations in structural ensemble calculation using eNOE data.

Main Results:

  • eNOE provides tighter distance restraints compared to conventional NOE analysis.
  • Improved restraints lead to higher resolution in macromolecular structure calculations.
  • eNOE enables the disentanglement of different molecular conformations.
  • Significant applications in determining the structures of proteins, RNA, and DNA.

Conclusions:

  • The eNOE methodology has matured with significant technical innovations and broad biological applications.
  • eNOE is crucial for high-resolution structural studies and conformational analysis of biomacromolecules.
  • Future directions include further methodological development and application to complex biological systems.