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Related Concept Videos

Applications Of NMR In Biology01:25

Applications Of NMR In Biology

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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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An applied magnetic field causes the electrons present in the molecule to circulate, setting up a local diamagnetic current within the molecule. The local diamagnetic current arising from circulating sigma-bonding electrons induces a magnetic field, Blocal that opposes the applied magnetic field, B0. The effective magnetic field experienced by these nuclei is given by the difference between the applied and local magnetic fields in a phenomenon called local diamagnetic shielding. Essentially,...
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The spin state of an NMR-active nucleus can have a slight effect on its immediate electronic environment. This effect propagates through the intervening bonds and affects the electronic environments of NMR-active nuclei up to three bonds away; occasionally, even farther. This phenomenon is called spin–spin coupling or J-coupling. Coupling interactions are mutual and result in small changes in the absorption frequencies of both nuclei involved. While nuclei of the same element are involved...
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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...
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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...
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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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Measuring Local Electrostatic Potentials Around Nucleic Acids by Paramagnetic NMR Spectroscopy.

Binhan Yu1, Xi Wang1, Junji Iwahara1

  • 1Department of Biochemistry & Molecular Biology, Sealy Center for Structural Biology & Molecular Biophysics, University of Texas Medical Branch301 University Blvd, Galveston, Texas77555-1068, United States.

The Journal of Physical Chemistry Letters
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Summary
This summary is machine-generated.

This study measures local electrostatic potentials around DNA using paramagnetic NMR. The novel method accurately quantifies potentials, confirming theoretical models and enabling new investigations into nucleic acid electrostatics.

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Area of Science:

  • Biophysics
  • Structural Biology
  • Nuclear Magnetic Resonance (NMR) Spectroscopy

Background:

  • Assessing electrostatic potentials around charged macromolecules like DNA is challenging, particularly for highly charged systems.
  • Understanding these potentials is crucial for DNA-protein interactions and molecular recognition.

Purpose of the Study:

  • To develop and apply a novel NMR-based method for measuring local electrostatic potentials around DNA.
  • To experimentally validate theoretical models of electrostatic potentials near DNA.

Main Methods:

  • Utilized paramagnetic NMR spectroscopy with paramagnetic cosolutes (positively charged or neutral).
  • Quantified NMR paramagnetic relaxation enhancement at over 100 sites in labeled DNA (15-bp).
  • Determined local electrostatic potentials around 1H nuclei in DNA major and minor grooves at 100 mM NaCl.

Main Results:

  • Successfully measured local electrostatic potentials around DNA with high site-specific resolution.
  • Experimental data confirmed predicted Coulombic end effects of DNA.
  • NMR-derived potentials closely matched predictions from the Poisson-Boltzmann equation.

Conclusions:

  • Paramagnetic NMR provides an unprecedented experimental approach to investigate nucleic acid electrostatics.
  • The method offers accurate quantification of local electrostatic potentials, validating theoretical models.
  • This technique opens new avenues for studying the electrostatic properties of DNA and other charged biomolecules.