Journal of Biomolecular NMR

, Volume 12, Issue 4, pp 471–492 | Cite as

Propagation of experimental uncertainties using the Lipari-Szabo model-free analysis of protein dynamics

  • Danqing Jin
  • Michael Andrec
  • Gaetano T. Montelione
  • Ronald M. Levy


In this paper we make use of the graphical procedure previously described [Jin, D. et al. (1997) J. Am. Chem. Soc., 119, 6923–6924] to analyze NMR relaxation data using the Lipari-Szabo model-free formalism. The graphical approach is advantageous in that it allows the direct visualization of the experimental uncertainties in the motional parameter space. Some general ‘rules’ describing the relationship between the precision of the relaxation measurements and the precision of the model-free parameters and how this relationship changes with the overall tumbling time (τm) are summarized. The effect of the precision in the relaxation measurements on the detection of internal motions not close to the extreme narrowing limit is analyzed. We also show that multiple timescale internal motions may be obscured by experimental uncertainty, and that the collection of relaxation data at very high field strength can improve the ability to detect such deviations from the simple Lipari-Szabo model.

model-free formalism NMR relaxation order parameter protein dynamics 


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Copyright information

© Kluwer Academic Publishers 1998

Authors and Affiliations

  • Danqing Jin
    • 1
  • Michael Andrec
    • 1
  • Gaetano T. Montelione
    • 2
    • 3
  • Ronald M. Levy
    • 1
  1. 1.Department of ChemistryWright-Rieman LaboratoriesUSA
  2. 2.Center for Advanced Biotechnology and MedicineUSA
  3. 3.cDepartment of Molecular Biology and Biochemistry, RutgersThe State University of New JerseyPiscatawayU.S.A

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