Part of the 1H-NMR spectra (25 °C, CDCl3, 300 MHz) showing the amide ...
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Part of the 1H-NMR spectra (25 °C, CDCl3, 300 MHz) showing the amide ... More...
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A DOTA-amide lanthanide tag for reliable generation of pseudocontact shifts in protein NMR spectra.
A DOTA-amide lanthanide tag for reliable generation of pseudocontact shifts in protein NMR spectra.
A DOTA-amide lanthanide tag for reliable generation of pseudocontact shifts in protein NMR spectra.
Bioconjug Chem. 2011 Aug 31;
Authors: Graham B, Loh CT, Swarbrick JD, Ung P, Shin J, Yagi H, Jia X, Chhabra S, Barlow N, Pintacuda G, Huber T, Otting G
Abstract
Structural studies of proteins and protein-ligand complexes by nuclear magnetic resonance (NMR) spectroscopy can be greatly enhanced by site-specific attachment of lanthanide ions to...
nmrlearner
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09-01-2011 05:20 PM
[NMR analysis blog] Alignment of NMR spectra – Part VI: Reaction Monitoring (II)
Alignment of NMR spectra – Part VI: Reaction Monitoring (II)
Previous posts on this series:
Alignment of NMR spectra – Part I: The problem
Alignment of NMR spectra – Part II: Binning / Bucketing
Alignment of NMR spectra – Part III: Global Alignment
Alignment of NMR spectra – Part IV: Advanced Alignment
Alignment of NMR spectra – Part V: Reaction Monitoring (I)
nmrlearner
News from NMR blogs
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02-10-2011 08:29 PM
[NMR analysis blog] Alignment of NMR spectra – Part V: Reaction Monitoring (I)
Alignment of NMR spectra – Part V: Reaction Monitoring (I)
Previous posts on this series:
1. Alignment of NMR spectra – Part I: The problem
2. Alignment of NMR spectra – Part II: Binning / Bucketing
3. Alignment of NMR spectra – Part III: Global Alignment
4. Alignment of NMR spectra – Part IV: Advanced Alignment
Following the progression of chemical reactions by NMR is becoming more and more popular. Quoting Michael A. Bernstein et al. (Magn. Reson. Chem. 2007; 45: 564–571)
nmrlearner
News from NMR blogs
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02-08-2011 08:16 PM
[NMR analysis blog] Alignment of NMR spectra – Part IV: Advanced Alignment
Alignment of NMR spectra – Part IV: Advanced Alignment
Previous posts on this series:
Alignment of NMR spectra – Part I: The problem
Alignment of NMR spectra – Part II: Binning / Bucketing
Alignment of NMR spectra – Part III: Global Alignment
As I mentioned in my previous post, simple alignment based on shifting or referencing the whole spectrum is not enough in cases where there are different local chemical shift fluctuations.
Resorting back to the synthetic data set used in the previous posts, let me introduce a semi-automatic method designed specifically to align spectra having...
nmrlearner
News from NMR blogs
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02-07-2011 07:53 PM
[NMR analysis blog] Alignment of NMR spectra – Part III: Global Alignment
Alignment of NMR spectra – Part III: Global Alignment
Previous posts on this series:
Alignment of NMR spectra – Part I: The problem
Alignment of NMR spectra – Part II: Binning / Bucketing
We have seen that binning helps in minimizing, for example, the effect of pH-induced fluctuations in chemical shift so that, in the field of NMR-based metabonomics studies, ensuring that signals for a given metabolite appear at the same location in all spectra. One evident disadvantage of binning is that it greatly reduces the spectral resolution (e.g. in a 500 MHz instrument, a typical 64 Kb...
nmrlearner
News from NMR blogs
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02-03-2011 06:51 PM
[NMR analysis blog] Alignment of NMR spectra – Part II: Binning / Bucketing
Alignment of NMR spectra – Part II: Binning / Bucketing
In my last post, I wrote that spectra of biological samples are usually poorly aligned due to wide changes in chemical shift arising from small variations in pH or other sample conditions such as ionic strength or temperature.
The most widely used method of addressing this chemical shift variability across spectra is by means of the so-called binning (or bucketing), procedure that consists in segmenting a spectrum into small areas (bins / buckets) and taking the area under the spectrum for each segment. Preferably, the size of the...
nmrlearner
News from NMR blogs
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01-31-2011 06:03 AM
[NMR analysis blog] Alignment of NMR spectra – The problem: Part I
Alignment of NMR spectra – The problem: Part I
The chemical shift is of great importance for NMR spectroscopy because it reflects the chemical environment of the nuclides under observation providing detailed information about the structure of a molecule.
Although the chemical shift of a nucleus in a molecule is generally assumed to be fairly stable, there are a number of experimental factors (pH, ionic strength, solvent, field inhomogeneity –bad shimming, temperature, etc) which might produce slight or even quite significant variations in chemical shifts.
This is particularly important...