I'd like to know if there are further NMR spectroscopic methods to detect NH---O hydrogen bond in N-(2-methoxyphenyl)benzamide compounds. I know about HNCO techniques, but they are specifc for carbonyl carbon. I have already tried to reveal any amide proton chemical shift variation with temperature and to measure the 1JNH by 1H,15N HSQC spectra, but I don't think these observables could be sufficient to show any scalar coupling between the methoxy oxygen and the amide proton.
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[NMR paper] Detection of a transient intramolecular hydrogen bond using 1JNH scalar couplings
Detection of a transient intramolecular hydrogen bond using 1JNH scalar couplings
Publication date: Available online 18 April 2014
Source:Journal of Magnetic Resonance</br>
Author(s): ShengQi Xiang , Markus Zweckstetter</br>
Hydrogen bonds are essential for the structure, stability and folding of proteins. The identification of intramolecular hydrogen bonds, however, is challenging, in particular in transiently folded states. Here we studied the presence of intramolecular hydrogen bonds in the folding nucleus of the coiled-coil structure of the GCN4 leucine zipper....
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04-18-2014 01:35 PM
[CNS Yahoo group] Re: peptide bond cut during annealing
Re: peptide bond cut during annealing
Hi Nic, thanks a lot! This was the solution as you suggested: I forgot to add the new residue into the link file to be patched with PEPT. SInce the involved
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nmrlearner
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03-05-2012 04:29 PM
[CNS Yahoo group] Re: peptide bond cut during annealing
Re: peptide bond cut during annealing
Yes. I have had this happen when I had to create a novel amino acid (oxidized cysteine) and didn't set it up to 'link' with the normal amino acids.
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nmrlearner
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[CNS Yahoo group] peptide bond cut during annealing
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Dear All, I was generated topologies/parameters for a new residue in a peptide. The generate.inp created a correct peptide bond from the new residue to the
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nmrlearner
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03-05-2012 04:04 AM
[CNS Yahoo group] Re: peptide bond cut during annealing
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Most likely, there is some error in topology. Please post your topology/parameter/link files for the unconventional residue.
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nmrlearner
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Improved accuracy in measuring one-bond and two-bond 15N,13Cα coupling constants in proteins by double-inphase/antiphase (DIPAP) spectroscopy
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Abstract An extension to HN(CO-α/β-N,Cα-J)-TROSY (Permi and Annila in J Biomol NMR 16:221â??227, 2000) is proposed that permits the simultaneous determination of the four coupling constants 1 J Nâ?²(i)Cα(i), 2 J HN(i)Cα(i), 2 J Cα(iâ??1)Nâ?²(i), and 3 J Cα(iâ??1)HN(i) in 15N,13C-labeled proteins. Contrasting the original scheme, in which two separate subspectra exhibit the 2 J CαNâ?² coupling as inphase and antiphase splitting (IPAP), we...
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[Question from NMRWiki Q&A forum] From what experiment only two bond correlations we can get in varian nmr?
From what experiment only two bond correlations we can get in varian nmr?
Hi., i have one compound i need only two bond correlation contours from quaternary carbon to proton. Is there any pulse sequence to find only two bond correlations ie, from quaternary carbon to protons with minimum amount of sample in "varian nmr".
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