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Xue, K. ; Mühlbauer, M. ; Mamone, S.* ; Sarkar, R. ; Reif, B.

Accurate determination of H-1-N-15 dipolar couplings using inaccurate settings of the magic angle in solid-state NMR spectroscopy.

Angew. Chem.-Int. Edit. 58, 4286-4290 (2019)

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Magic-angle spinning (MAS) is an essential ingredient in a wide variety of solid-state NMR experiments. The standard procedures to adjust the rotor angle are not highly accurate, resulting in a slight misadjustment of the rotor from the magic angle (RL= ) on the order of a few millidegrees. This small missetting has no significant impact on the overall spectral resolution, but is sufficient to reintroduce anisotropic interactions. Shown here is that site-specific H-1-N-15 dipolar couplings can be accurately measured in a heavily deuterated protein. This method can be applied at arbitrarily high MAS frequencies, since neither rotor synchronization nor particularly high radiofrequency field strengths are required. The off-MAS method allows the quantification of order parameters for very dynamic residues, which often escape an analysis using existing methods.

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