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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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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 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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PRE-driven protein NMR structures: an alternative approach in highly paramagnetic systems.

Inês B Trindade1, Michele Invernici2, Francesca Cantini2

  • 1Instituto de Tecnologia Química e Biológica António Xavier (ITQB-NOVA), Universidade Nova de Lisboa, Oeiras, Portugal.

The FEBS Journal
|October 30, 2020
PubMed
Summary

Nuclear Magnetic Resonance (NMR) methods can now characterize paramagnetic metalloproteins using Paramagnetic Relaxation Enhancements (PREs) to complement or replace Nuclear Overhauser Enhancements (NOEs). This advance enables detailed structural insights into these vital biomolecules.

Keywords:
NMR solution structureiron-sulfur proteinsmetalloproteinsparamagnetic NMRparamagnetic relaxation enhancement

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Area of Science:

  • Biochemistry
  • Structural Biology
  • Biophysics

Background:

  • Metalloproteins are crucial in biological processes, but their structure determination is challenging.
  • Paramagnetic metalloproteins exhibit enhanced relaxation near metal centers, hindering traditional Nuclear Magnetic Resonance (NMR) signal detection.
  • Nuclear Overhauser Enhancements (NOEs) are standard NMR restraints for structure determination.

Purpose of the Study:

  • To investigate the utility of Paramagnetic Relaxation Enhancements (PREs) as NMR restraints for metalloprotein structure determination.
  • To compare structures derived from NOEs, PREs, and a combination of both.
  • To assess the potential of PREs to complement or replace NOEs for characterizing paramagnetic metalloproteins.

Main Methods:

  • Protein structure determination using NMR spectroscopy.
  • Application of Nuclear Overhauser Enhancements (NOEs) and Paramagnetic Relaxation Enhancements (PREs) as distance restraints.
  • Utilized PioC, a High Potential Iron-Sulfur Protein (HiPIP) from Rhodopseudomonas palustris TIE-1, containing a paramagnetic [4Fe-4S] cluster.
  • Comparison of structural ensembles generated by NOEs only, PREs only, and combined restraints.

Main Results:

  • Structures determined using NOEs only, PREs only, and combined restraints showed comparable root-mean-square deviation (RMSD) values.
  • PREs provided effective distance restraints, similar in precision to NOEs under favorable conditions.
  • The study successfully demonstrated the application of PREs for structural characterization of a paramagnetic metalloprotein.

Conclusions:

  • Paramagnetic Relaxation Enhancements (PREs) can effectively complement or even replace Nuclear Overhauser Enhancements (NOEs) for NMR-based structural determination of small paramagnetic metalloproteins.
  • This approach is applicable to both naturally occurring and de novo-designed metalloproteins.
  • The findings expand the toolkit for structural biologists studying metalloproteins.