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Double Resonance Techniques: Overview

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Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
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When magnetic nuclei in a sample achieve resonance and undergo relaxation, the signal detected in NMR is an approximately exponential free induction decay. Fourier transform of an exponential decay yields a Lorentzian peak in the frequency domain. Lorentzian peaks in an NMR spectrum are defined by their amplitude, full width at half maximum, and position, where the peak width is governed by the spin-spin relaxation time alone. In real experiments, however, the applied magnetic field is rendered...

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Atomic Scale Structural Studies of Macromolecular Assemblies by Solid-state Nuclear Magnetic Resonance Spectroscopy

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Published on: September 17, 2017

Multiple-oscillating-field techniques for accurate distance measurements by solid-state NMR.

Lasse Arnt Straasø¹, Morten Bjerring, Navin Khaneja

¹Center for Insoluble Protein Structures (inSPIN), Interdisciplinary Nanoscience Center (iNANO) and Department of Chemistry, University of Aarhus, DK-8000 Aarhus C, Denmark.

The Journal of Chemical Physics

|June 18, 2009

Summary

This study introduces an advanced NMR technique to overcome dipolar truncation, enabling precise measurement of long-range distances in proteins. The new method significantly improves accuracy for studying molecular structures.

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Published on: August 6, 2018

Area of Science:

Solid-state Nuclear Magnetic Resonance (NMR) Spectroscopy
Biophysical Chemistry
Structural Biology

Background:

Dipolar truncation in solid-state NMR limits accurate measurement of long-range internuclear distances in uniformly labeled proteins.
Current methods rely on less accurate proton-mediated spin diffusion for estimating these couplings, leaving valuable structural information untapped.

Purpose of the Study:

To develop an advanced technique for dipolar recoupling that overcomes dipolar truncation in homonuclear spin systems.
To improve the accuracy and range of internuclear distance measurements in solid-state NMR spectroscopy.

Main Methods:

Extension of the triple-oscillating field technique using a more advanced radiofrequency (rf) modulation with four independent oscillations and rotations.
Implementation of nonorthogonal axes rotations to enhance the recoupling efficiency.
Numerical simulations and experimental validation on uniformly labeled L-threonine and ubiquitin proteins.

Main Results:

The novel multiple-field oscillating recoupling approach improves the scaling factor of recoupled dipole-dipole couplings by 2.5 times compared to the previous triple-field method.
Refocusing of defocused parts of the residual dipolar coupling Hamiltonian allows for measurement of weaker couplings and longer distances with higher accuracy.
Successful experimental demonstration on biomolecular samples.

Conclusions:

The developed technique effectively overcomes dipolar truncation, enabling more accurate determination of long-range internuclear distances in solid-state NMR.
This advancement significantly enhances the exploitation of (13)C-(13)C dipolar couplings for structural constraint determination in biomolecules.