Dynamics of the DNA binding domain of the fructose repressor from the analysis of linear correlations between the 15N-1H bond spectral densities obtained by nuclear magnetic resonance spectroscopy

Biochemistry
C van HeijenoortE Guittet

Abstract

The spectral densities of the backbone and arginine side chain NH bonds of the DNA binding domain of the fructose repressor (FruR) were extensively analyzed in order to extract reliable motions parameters. An accurate measurement of 15N NMR relaxation rates allowed their calculation at three frequencies, zero, omegaN, and omegaH + omegaN, using a reduced matrix approach. Linear correlations were found between J(omegaN) and J(0) and between <J(omegaH)> and J(0). The analysis of the compatibility between the motions parameters obtained independently from the two correlation lines allowed further development of the linear correlation approach proposed recently [Lefèvre, J. F., Dayie, K. T., Peng, J. W., and Wagner, G. (1996) Biochemistry 35, 2674-2686]. The results demonstrate (i) the existence of a concerted motion along the whole backbone with a global correlation time equal to 5.95 ns.rad-1, and (ii) the presence of complex internal movements at an intermediate time scale around 1 ns. The extracted motion parameters have been related to those obtained with the extended Lipari and Szabo approach but are incompatible with those obtained using the usual simple Lipari and Szabo approach. They were correlated to the features of the ...Continue Reading

Citations

Nov 8, 2001·Journal of Biomolecular Structure & Dynamics·A AlexandrovichA N Lane
Sep 8, 2001·Journal of Molecular Biology·M V BotuyanC H Arrowsmith
Feb 28, 2002·Journal of Molecular Biology·Stéphanie RamboarinaBruno Kieffer
Mar 25, 2004·The Journal of Biological Chemistry·Michael DomanskiCarine van Heijenoort

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