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- W2040381211 abstract "We have used ab initio calculations to compute all of the tensor elements of the electric field gradient for each carbon-deuterium bond in the ring of deuterated 3-methyl-indole. Previous analyses have ignored the smaller tensor elements perpendicular to principal component Vzz which is aligned with the C-2H bond (local bond z-axis). At each ring position, the smallest element Vxx is in the molecular plane and Vyy is normal to the plane of the ring. The asymmetry parameter = (Vyy - Vxx)/Vzz ranges from 0.07 at C4 to 0.11 at C2. We used the perpendicular (off-bond) tensor elements, in concert with an improved understanding of the indole ring geometry, to analyze prototype 2H NMR spectra from well-oriented, hydrated peptide/lipid samples. For each of the four tryptophans of membrane-spanning gramicidin A (gA) channels, the inclusion of the perpendicular elements changes the deduced ring tilt by nearly 10 and increases the ring principal order parameter Szz for overall wobble with respect to the membrane normal (molecular z-axis). With the improved analysis, the magnitude of Szz for the outermost indole rings of Trp13 and Trp15 is indistinguishable from that observed previously for backbone atoms (0.93 +/- 0.03). For the Trp9 and Trp11 rings, which are slightly more buried within the membrane, Szz is slightly lower (0.86 +/- 0.03). The results show that the perpendicular elements are important for the detailed analysis of 2H NMR spectra from aromatic ring systems." @default.
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- W2040381211 date "2005-11-17" @default.
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- W2040381211 title "Importance of Tensor Asymmetry for the Analysis of <sup>2</sup>H NMR Spectra from Deuterated Aromatic Rings" @default.
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- W2040381211 doi "https://doi.org/10.1021/ja054935x" @default.
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