We present a pulse scheme that exploits methyl 1H triple-quantum (TQ) coherences for the measurement of diffusion rates of slowly diffusing molecules in solution. It is based on the well-known stimulated echo experiment, with encoding and decoding of TQ coherences. The size of quantifiable diffusion coefficients is thus lowered by an order of magnitude with respect to single-quantum (SQ) approaches. Notably, the sensitivity of the scheme is high, approximately ¾ that of the corresponding single quantum experiment, neglecting relaxation losses, and on the order of a factor of 4 more sensitive than a previously published sequence for AX3 spin systems (Zheng et al. in JMR 198:271â??274, 2009) for molecules that are only 13C labeled at the methyl carbon position. Diffusion coefficients measured from TQ- and SQ-based experiments recorded on a range of protein samples are in excellent agreement. We present an application of this technique to the study of phase-separated proteins where protein concentrations in the condensed phase can exceed 400Â*mg/mL, diffusion coefficients can be as low as ~10â??9 cm2sâ??1 and traditional SQ experiments fail.
[NMR paper] Theoretical analysis of geometry and NMR isotope shift in hydrogen-bonding center of photoactive yellow protein by combination of multicomponent quantum mechanics and ONIOM scheme.
Theoretical analysis of geometry and NMR isotope shift in hydrogen-bonding center of photoactive yellow protein by combination of multicomponent quantum mechanics and ONIOM scheme.
Theoretical analysis of geometry and NMR isotope shift in hydrogen-bonding center of photoactive yellow protein by combination of multicomponent quantum mechanics and ONIOM scheme.
J Chem Phys. 2014 Nov 14;141(18):185101
Authors: Kanematsu Y, Tachikawa M
Abstract
Multicomponent quantum mechanical (MC_QM) calculation has been extended with ONIOM (our...
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[NMR paper] Measuring translational diffusion coefficients of peptides and proteins by PFG-NMR using band-selective RF pulses.
Measuring translational diffusion coefficients of peptides and proteins by PFG-NMR using band-selective RF pulses.
http://www.bionmr.com//www.ncbi.nlm.nih.gov/corehtml/query/egifs/http:--production.springer.de-OnlineResources-Logos-springerlink.gif Related Articles Measuring translational diffusion coefficients of peptides and proteins by PFG-NMR using band-selective RF pulses.
Eur Biophys J. 2014 May 14;
Authors: Yao S, Weber DK, Separovic F, Keizer DW
Abstract
Molecular translational self-diffusion, a measure of diffusive...
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[NMR paper] Magic-Angle-Spinning NMR Techniques for Measuring Long-Range Distances in Biological Macromolecules.
Magic-Angle-Spinning NMR Techniques for Measuring Long-Range Distances in Biological Macromolecules.
http://www.ncbi.nlm.nih.gov/corehtml/query/egifs/http:--pubs.acs.org-images-pubmed-acspubs.jpg Related Articles Magic-Angle-Spinning NMR Techniques for Measuring Long-Range Distances in Biological Macromolecules.
Acc Chem Res. 2013 Feb 7;
Authors: Hong M, Schmidt-Rohr K
Abstract
The determination of molecular structures using solid-state NMR spectroscopy requires distance measurement through nuclear-spin dipole-dipole couplings....
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02-09-2013 12:18 AM
[NMR paper] A straightforward method for stereospecific assignment of val and leu prochiral methyl groups by solid-state NMR: Scrambling in the [2-(13)C]Glucose labeling scheme.
A straightforward method for stereospecific assignment of val and leu prochiral methyl groups by solid-state NMR: Scrambling in the Glucose labeling scheme.
http://www.ncbi.nlm.nih.gov/corehtml/query/egifs/http:--linkinghub.elsevier.com-ihub-images-PubMedLink.gif Related Articles A straightforward method for stereospecific assignment of val and leu prochiral methyl groups by solid-state NMR: Scrambling in the Glucose labeling scheme.
J Magn Reson. 2013 Jan 4;228C:45-49
Authors: Lv G, Faßhuber HK, Loquet A, Demers JP, Vijayan V, Giller K, Becker S, Lange A
...
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A straightforward method for stereospecific assignment of val and leu prochiral methyl groups by solid-state NMR: Scrambling in the [2-13C]Glucose labeling scheme
A straightforward method for stereospecific assignment of val and leu prochiral methyl groups by solid-state NMR: Scrambling in the Glucose labeling scheme
Available online 4 January 2013
Publication year: 2013
Source:Journal of Magnetic Resonance</br>
</br>
The unambiguous stereospecific assignment of the prochiral methyl groups in Val and Leu plays an important role in the structural investigation of proteins by NMR. Here, we present a straightforward method for their stereospecific solid-state NMR assignment based on Glucose (Glc) as the sole carbon source during...
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01-08-2013 09:23 AM
Origin and removal of mixed-phase artifacts in gradient sensitivity enhanced heteronuclear single quantum correlation spectra
Origin and removal of mixed-phase artifacts in gradient sensitivity enhanced heteronuclear single quantum correlation spectra
Abstract Here we describe phasing anomalies observed in gradient sensitivity enhanced 15N-1H HSQC spectra, and analyze their origin. It is shown that, as a result of 15N off-resonance effects, dispersive contributions to the 1H signal become detectable, and lead to 15N-offset dependent phase errors. Strategies that effectively suppress these artifacts are presented.
Content Type Journal Article
Category Article
Pages 199-207
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Signal enhancement for the sensitivity-limited solid state NMR experiments using a continuous, non-uniform acquisition scheme.
Signal enhancement for the sensitivity-limited solid state NMR experiments using a continuous, non-uniform acquisition scheme.
Signal enhancement for the sensitivity-limited solid state NMR experiments using a continuous, non-uniform acquisition scheme.
J Magn Reson. 2011 Aug 30;
Authors: Qiang W
Abstract
We describe a sampling scheme for the two-dimensional (2D) solid state NMR experiments, which can be readily applied to the sensitivity-limited samples. The sampling scheme utilizes continuous, non-uniform sampling profile for the...
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09-21-2011 03:31 PM
[NMR paper] Characterisation by triple-quantum filtered 17O-NMR of water molecules buried in lyso
Characterisation by triple-quantum filtered 17O-NMR of water molecules buried in lysozyme and trapped in a lysozyme-inhibitor complex.
Related Articles Characterisation by triple-quantum filtered 17O-NMR of water molecules buried in lysozyme and trapped in a lysozyme-inhibitor complex.
Biophys Chem. 1999 Mar 29;77(2-3):111-21
Authors: Baguet E, Hennebert N
Triple-quantum filtering NMR sequences were used to study the multiexponential relaxation behaviour of H2 17O in the presence of hen egg white lysozyme. By this means, the fraction and the...
An enhanced sensitivity methyl 1 H triple-quantum pulse scheme for measuring diffusion constants of macromolecules
Linear Mode
