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J Magn Reson. 2006 May;180(1):93-104. Epub 2006 Feb 3.

Faithful estimation of dynamics parameters from CPMG relaxation dispersion measurements.

Author information

1
Department of Chemistry, Yale University, P.O. Box 208107, New Haven, CT 06520, USA.

Abstract

This work examines the robustness of fitting of parameters describing conformational exchange (k(ex), p(a/b), and Deltaomega) processes from CPMG relaxation dispersion data. We have analyzed the equations describing conformational exchange processes for the intrinsic inter-dependence of their parameters that leads to the existence of multiple equivalent solutions, which equally satisfy the experimental data. We have used Monte-Carlo simulations and fitting to the synthetic data sets as well as the direct 3-D mapping of the parameter space of k(ex), p(a/b), and Deltaomega to quantitatively assess the degree of the parameter inter-dependence. The demonstrated high correlation between parameters can preclude accurate dynamics parameter estimation from NMR spin-relaxation data obtained at a single static magnetic field. The strong parameter inter-dependence can readily be overcome through acquisition of spin-relaxation data at more than one static magnetic field thereby allowing accurate assessment of conformational exchange properties.

PMID:
16458551
DOI:
10.1016/j.jmr.2006.01.010
[Indexed for MEDLINE]

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