Determination of the residue-specific 15N CSA tensor principal components using multiple alignment media

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The individual components of the backbone 15N CSA tensor, σ11, σ22, σ33, and the orientation of σ11 relative to the NH bond described by the angle β have been determined for uniformly labeled 15N, 13C ubiquitin from partial alignment in phospholipid bicelles, Pf1 phage, and poly(ethylene glycol) by measuring the residue-specific residual dipolar couplings and chemical shift deviations. No strong correlation between any of the CSA tensor components is observed with any single structural feature. However, the experimentally determined tensor components agree with the previously determined average CSA principal components [Cornilescu and Bax (2000) J. Am. Chem. Soc. 122, 10143–10154]. Significant deviations from the averages coincide with residues in β-strand or extended regions, while α-helical residue tensor components cluster close to the average values.

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