WaterControl is a solvent suppression method based on WATERGATE and PGSTEÂ*and is very efficient in selectively reducing the solvent signal in 1D pulse-acquire and 2D NOESY of protein solutions. In this study, the WaterControl technique was appended to two common 2D NMR methods used in resonance assignment of proteins, namely TOCSY and CLIP-COSY. Similar to that observed in regular 1D pulse-acquire and 2D NOESY, the incorporation of WaterControl in these 2D methods led to excellent solvent suppression superior to that obtained using W3- or W5-based WATERGATE sequences. The water signal was essentially eliminated in the TOCSY and CLIP-COSY with WaterControl while useful cross peaks around the water resonance at Ï?2 were preserved. This is in contrast to the 2D spectra obtained from the corresponding WATERGATE containing sequences, where these cross peaks in the Ï?2 region are usually suppressed together with the water resonance. These new WaterControl sequences provide significantly improved water suppression thereby facilitating protein NMR studies.
Understanding and solving abnormal peak splitting in 3D HCCH-TOCSY and HCC(CO)NH-TOCSY
Understanding and solving abnormal peak splitting in 3D HCCH-TOCSY and HCC(CO)NH-TOCSY
Abstract
The 3D HCCH-TOCSY and HCC(CO)NH-TOCSY experiments provide through bond connectivity and are used for side-chain chemical shift assignment by solution-state NMR. Careful design and implementation of the pulse sequence are key to the successful application of the technique particularly when trying to extract the maximum information out of challenging biomolecules. Here we investigate the source of and propose solutions for abnormal peak splitting ranging from...
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[NMR paper] Absolute Minimal Sampling of Homonuclear 2D NMR TOCSY Spectra for High-Throughput Applications of Complex Mixtures
Absolute Minimal Sampling of Homonuclear 2D NMR TOCSY Spectra for High-Throughput Applications of Complex Mixtures
Modern applications of 2D NMR spectroscopy to diagnostic screening, metabolomics, quality control, and other high-throughput applications are often limited by the time-consuming sampling requirements along the indirect time domain t1. 2D total correlation spectroscopy (TOCSY) provides unique spin connectivity information for the analysis of a large number of compounds in complex mixtures, but standard methods typically require >100 t1 increments for an accurate spectral...
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06-13-2017 09:46 PM
[NMR paper] Analytical optimization of active bandwidth and quality factor for TOCSY experiments in NMR spectroscopy.
Analytical optimization of active bandwidth and quality factor for TOCSY experiments in NMR spectroscopy.
Related Articles Analytical optimization of active bandwidth and quality factor for TOCSY experiments in NMR spectroscopy.
J Biomol NMR. 2016 Aug 11;
Authors: Coote P, Bermel W, Wagner G, Arthanari H
Abstract
Active bandwidth and global quality factor are the two main metrics used to quantitatively compare the performance of TOCSY mixing sequences. Active bandwidth refers to the spectral region over which at least 50*% of the...
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08-16-2016 07:38 PM
Analytical optimization of active bandwidth and quality factor for TOCSY experiments in NMR spectroscopy
Analytical optimization of active bandwidth and quality factor for TOCSY experiments in NMR spectroscopy
Abstract
Active bandwidth and global quality factor are the two main metrics used to quantitatively compare the performance of TOCSY mixing sequences. Active bandwidth refers to the spectral region over which at least 50Â*% of the magnetization is transferred via a coupling. Global quality factor scores mixing sequences according to the worst-case transfer over a range of possible mixing times and chemical shifts. Both...
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08-12-2016 10:36 AM
[NMR paper] Applications of high dimensionality experiments to biomolecular NMR.
Applications of high dimensionality experiments to biomolecular NMR.
Applications of high dimensionality experiments to biomolecular NMR.
Prog Nucl Magn Reson Spectrosc. 2015 Nov;90-91:49-73
Authors: Nowakowski M, Saxena S, Stanek J, ?erko S, Ko?mi?ski W
Abstract
High dimensionality NMR experiments facilitate resonance assignment and precise determination of spectral parameters such as coupling constants. Sparse non-uniform sampling enables acquisition of experiments of high dimensionality with high resolution in acceptable...
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11-26-2015 12:13 AM
Applications of high dimensionality experiments to biomolecular NMR
Applications of high dimensionality experiments to biomolecular NMR
Publication date: Available online 11 July 2015
Source:Progress in Nuclear Magnetic Resonance Spectroscopy</br>
Author(s): Micha? Nowakowski , Saurabh Saxena , Jan Stanek , Szymon ?erko , Wiktor Ko?mi?ski</br>
High dimensionality NMR experiments facilitate resonance assignment and precise determination of spectral parameters such as coupling constants. Sparse non-uniform sampling enables acquisition of experiments of high dimensionality with high resolution in acceptable time. In this review...
HNCA-TOCSY-CANH experiments with alternate 13C-12C labeling: a set of 3D experiment w
HNCA-TOCSY-CANH experiments with alternate 13C-12C labeling: a set of 3D experiment with unique supra-sequential information for mainchain resonance assignment
Abstract Described here is a set of three-dimensional (3D) NMR experiments that rely on CACA-TOCSY magnetization transfer via the weak
3 \textJ\textCa\textCa coupling. These pulse sequences, which resemble recently described 13C detected CACA-TOCSY (Takeuchi et al. 2010) experiments, are recorded in 1H2O, and use 1H excitation and detection. These experiments require alternate 13C-12C labeling together with perdeuteration,...
Applications of WaterControl to TOCSY and COSY experiments
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