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- W2076393501 abstract "An analytical method for the determination of torsion angles from solid state 15N nuclear magnetic resonance (n.m.r.) spectroscopic data is demonstrated. Advantage is taken of the 15N1H and 15N13C dipolar interactions as well as the 15N chemical shift interaction in oriented samples. The membrane-bound channel conformation of gramicidin A has eluded an atomic resolution structure determination by more traditional approaches. Here, the torsion angles for the Ala3 site are determined by obtaining the n.m.r. data for both the Gly2-Ala3 and Ala3-Leu4 peptide linkages. Complete utilization of the orientational constraints derived from these orientation-dependent nuclear spin interactions in restricting the conformational space is most effectively achieved by utilizing spherical trigonometry. Two possible sets of torsion angles for the Ala3 site are obtained (φ, ψ = −129 °, 153 ° and −129 °, 122 °), both of which are consistent with a right-handed β-helix. Other functional and computational evidence strongly supports the set for which the carbonyl oxygen atom of the Ala3-Leu4 linkage is rotated into the channel lumen." @default.
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- W2076393501 date "1991-04-01" @default.
- W2076393501 modified "2023-10-10" @default.
- W2076393501 title "Experimental determination of torsion angles in the polypeptide backbone of the gramicidin a channel by solid state nuclear magnetic resonance" @default.
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- W2076393501 doi "https://doi.org/10.1016/0022-2836(91)90705-b" @default.
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