Intensity and mosaic spread analysis from PISEMA tensors in solid-state NMR

J. R. Quine, S. Achuthan, T. Asbury, R. Bertram, M. S. Chapman, J. Hu, T. A. Cross

Research output: Contribution to journalArticlepeer-review

21 Scopus citations


The solid-state NMR experiment PISEMA, is a technique for determining structures of proteins, especially membrane proteins, from oriented samples. One method for determining the structure is to find orientations of local molecular frames (peptide planes) with respect to the unit magnetic field direction, B0. This is done using equations that compute the coordinates of this vector in the frames. This requires an analysis of the PISEMA function and its degeneracies. As a measure of the sensitivity of peptide plane orientations to the data, we use these equations to derive a formula for the intensity function in the powder pattern. With this function and other measures, we investigate the effect of small changes in peptide plane orientations depending on the location of the resonances in the powder pattern spectrum. This gives us an indication of the change in lineshape due to mosaic spread and a way to interpret these in terms of an orientational error bar.

Original languageEnglish (US)
Pages (from-to)190-198
Number of pages9
JournalJournal of Magnetic Resonance
Issue number2
StatePublished - Apr 2006
Externally publishedYes


  • Lineshapes
  • Mosaic spread
  • PISEMA tensors
  • Powder pattern intensity
  • Solid-state NMR

ASJC Scopus subject areas

  • Biophysics
  • Biochemistry
  • Nuclear and High Energy Physics
  • Condensed Matter Physics


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