Cross-correlated relaxation rates between protein backbone Hâ??X dipolar interactions

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Cross-correlated relaxation rates between protein backbone Hâ??X dipolar interactions

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03-13-2017, 02:54 AM

nmrlearner

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Cross-correlated relaxation rates between protein backbone Hâ??X dipolar interactions

Cross-correlated relaxation rates between protein backbone Hâ??X dipolar interactions

Abstract

The relaxation interference between dipoleâ??dipole interactions of two separate spin pairs carries structural and dynamics information. In particular, when compared to individual dynamic behavior of those spin pairs, such cross-correlated relaxation (CCR) rates report on the correlation between the spin pairs. We have recently mapped out correlated motion along the backbone of the protein GB3, using CCR rates among and between consecutive HNâ??N and HÎ±â??CÎ± dipoleâ??dipole interactions. Here, we provide a detailed account of the measurement of the four types of CCR rates. All rates were obtained from at least two different pulse sequences, of which the yet unpublished ones are presented. Detailed comparisons between the different methods and corrections for unwanted pathways demonstrate that the averaged CCR rates are highly accurate and precise with errors of 1.5â??3% of the entire value ranges.

Source: Journal of Biomolecular NMR

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