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When proton-coupled carbon-13 spectra are simplified by a broadband proton decoupling technique, structural information about the coupled protons is lost. Distortionless enhancement by polarization transfer (DEPT) is a technique that provides information on the number of hydrogens attached to each carbon in a molecule. While the DEPT experiment utilizes complex pulse sequences, the pulse delay and flip angle are specifically manipulated. The resulting signals have different phases depending on...
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Two-Dimensional (2D) NMR: Overview01:12

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The 1D NMR spectrum of large and complex molecules like natural products has complicated splitting patterns and overlapping signals, which can be easily interpreted using 2-dimensional (2D) NMR. Unlike 1D NMR, 2D NMR has two frequency axes that provide the coupling information between the nucleus A and nucleus B in a molecule. The process from which 2D spectra are obtained has four steps.
The first step is the preparation period, during which nucleus A is excited with a radiofrequency pulse....
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¹H NMR: Complex Splitting01:13

¹H NMR: Complex Splitting

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A proton M that is coupled to a proton X results in doublet signals for M. However, NMR-active nuclei can be simultaneously coupled to more than one nonequivalent nucleus. When M is coupled to a second proton A, such as in styrene oxide, each peak in the doublet is split into another doublet.
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Proton (¹H) NMR: Chemical Shift01:07

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Organic molecules primarily contain carbon and hydrogen atoms. While all the hydrogen isotopes are NMR-active, protium or hydrogen-1 is the most abundant. It has a significant energy separation between its nuclear spin states due to its large gyromagnetic ratio. As per Boltzmann's distribution, an increase in the energy separation implies a greater excess population of nuclei available for excitation, resulting in a strong NMR absorption signal.
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¹H NMR of Labile Protons: Deuterium (²H) Substitution00:48

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This lesson illustrates the role of deuterium substitution in simplifying the NMR spectrum of compounds comprising labile protons. One method employed is the use of deuterium. Amongst the three isotopes of hydrogen, deuterium (2H) has a nucleus composed of one proton and one neutron. When the D2O solvent is added to a pure dry ethanol solution, its labile proton is substituted with deuterium.
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¹H NMR: Interpreting Distorted and Overlapping Signals01:02

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Spin systems where the difference in chemical shifts of the coupled nuclei is greater than ten times J are called first-order spin systems. These nuclei are weakly coupled, and their chemical shifts and coupling constant can generally be estimated from the well-separated signals in the spectrum.
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Exploring Protein Structures by DNP-Enhanced Methyl Solid-State NMR Spectroscopy.

Jiafei Mao1,2, Victoria Aladin2,3,4, Xinsheng Jin5

  • 1Institute of Biophysical Chemistry , Goethe University Frankfurt , 60438 Frankfurt am Main , Germany.

Journal of the American Chemical Society
|November 23, 2019
PubMed
Summary
This summary is machine-generated.

This study introduces a new methyl-based toolkit for protein structure analysis using dynamic nuclear polarization (DNP) enhanced solid-state NMR (ssNMR). This method utilizes methyl groups as sensors and "NMR torches" to reveal protein packing and ligand-binding sites.

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Area of Science:

  • Biophysics
  • Structural Biology
  • Spectroscopy

Background:

  • Dynamic nuclear polarization (DNP) significantly enhances solid-state NMR (ssNMR) sensitivity, enabling broader applications.
  • Further methodological advancements are crucial to fully leverage DNP-ssNMR for complex biological systems.
  • Existing ssNMR methods have limitations in probing specific molecular environments and short-range structural information.

Purpose of the Study:

  • To develop a novel methyl-based toolkit for protein structure determination using DNP-ssNMR.
  • To utilize methyl groups as dynamic sensors and 'NMR torches' for probing protein structure and function.
  • To extend the capabilities of ssNMR for investigating large biomolecules like membrane proteins.

Main Methods:

  • Integration of DNP for signal enhancement with heteronuclear Overhauser effect (hetNOE) and carbon-carbon spin diffusion (SD).
  • Strategic design of isotope-labeling schemes to maximize information from methyl groups.
  • Application of 13C-13C spin diffusion for probing subnanometer distances.

Main Results:

  • Methyl groups effectively probe local molecular packing and serve as 'NMR torches' to illuminate specific regions, such as ligand-binding pockets.
  • The 13C-13C spin diffusion method bridges the resolution gap between conventional ssNMR and EPR spectroscopy.
  • Demonstrated applicability on the large membrane protein, green proteorhodopsin (GPR), providing insights into its photocycle mechanism.

Conclusions:

  • The developed methyl-based DNP-ssNMR toolkit offers a powerful new approach for protein structure and dynamics analysis.
  • Methyl groups are versatile probes for understanding protein architecture and functional sites.
  • This methodology enhances the study of large and complex biological systems, including membrane proteins.