Access to Cα Backbone Dynamics of Biological Solids by 13C T1 Relaxation and Molecular Dynamics Simulation

S Asami, JR Porter, OF Lange… - Journal of the American …, 2015 - ACS Publications
S Asami, JR Porter, OF Lange, B Reif
Journal of the American Chemical Society, 2015ACS Publications
We introduce a labeling scheme for magic angle spinning (MAS) solid-state NMR that is
based on deuteration in combination with dilution of the carbon spin system. The labeling
strategy achieves spectral editing by simplification of the HαCα and aliphatic side chain
spectral region. A reduction in both proton and carbon spin density in combination with fast
spinning (≥ 50 kHz) is essential to retrieve artifact-free 13C-R 1 relaxation data for aliphatic
carbons. We obtain good agreement between the NMR experimental data and order …
We introduce a labeling scheme for magic angle spinning (MAS) solid-state NMR that is based on deuteration in combination with dilution of the carbon spin system. The labeling strategy achieves spectral editing by simplification of the HαCα and aliphatic side chain spectral region. A reduction in both proton and carbon spin density in combination with fast spinning (≥50 kHz) is essential to retrieve artifact-free 13C-R1 relaxation data for aliphatic carbons. We obtain good agreement between the NMR experimental data and order parameters extracted from a molecular dynamics (MD) trajectory, which indicates that carbon based relaxation parameters can yield complementary information on protein backbone as well as side chain dynamics.
ACS Publications
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