Document Type

Article

Publication Date

5-2006

Source Publication

Journal of Magnetic Resonance

Abstract

This work examines the robustness of fitting of parameters describing conformational exchange (kex, pa/b, and Δω) 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 kex, pa/b, and Δω 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.

Comments

Accepted version. Journal of Magnetic Resonance, Vol. 180, No. 1 (May 2006): 93-104. DOI: © 2006 Elsevier Inc. Used with permission.

kovriguine_3531acc.docx (1277 kB)
ADA accessible version

Included in

Chemistry Commons

Share

COinS