<Emphasis Type="Italic">J</Emphasis>-Spectroscopy in the presence of residual dipolar couplings: determination of one-bond coupling constants and scalable resolution |
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Authors: | Julien Furrer Michael John Horst Kessler Burkhard Luy |
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Institution: | 1.Organisch-Chemisches Institut,Universit?t Heidelberg,Heidelberg,Germany;2.Department Chemie: Organische Chemie II,Technische Universit?t München,Garching,Germany |
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Abstract: | The access to weak alignment media has fuelled the development of methods for efficiently and accurately measuring residual
dipolar couplings (RDCs) in NMR-spectroscopy. Among the wealth of approaches for determining one-bond scalar and RDC constants
only J-modulated and J-evolved techniques retain maximum resolution in the presence of differential relaxation. In this article, a number of J-evolved experiments are examined with respect to the achievable minimum linewidth in the J-dimension, using the peptide PA4 and the 80-amino-acid-protein Saposin C as model systems. With the JE-N-BIRD
d,X
-HSQC experiment, the average full-width at half height could be reduced to approximately 5 Hz for the protein, which allows
the additional resolution of otherwise unresolved peaks by the active (J+D)-coupling. Since RDCs generally can be scaled by the choice of alignment medium and alignment strength, the technique introduced
here provides an effective resort in cases when chemical shift differences alone are insufficient for discriminating signals.
In favorable cases even secondary structure elements can be distinguished. |
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Keywords: | RDCs BIRD-element Scalable resolution J-Evolution J-Spectroscopy |
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