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A Suite of 2H NMR Spin Relaxation Experiments for the Measurement of RNA Dynamics
Pramodh Vallurupalli and Lewis E. Kay, J. Am. Chem. Soc.; 2005; 127 (18) pp 6893 - 6901

ABSTRACT:

A suite of (2)H-based spin relaxation NMR experiments is presented for the measurement of molecular dynamics in a site-specific manner in uniformly (13)C, randomly fractionally deuterated ( approximately 50%) RNA molecules. The experiments quantify (2)H R(1) and R(2) relaxation rates that can subsequently be analyzed to obtain information about dynamics on a pico- to nanosecond time scale. Sensitivity permitting, the consistency of the data can be evaluated by measuring all five rates that are accessible for a spin 1 particle and establishing that the rates obey relations that are predicted from theory. The utility of the methodology is demonstrated with studies of the dynamics of a 14-mer RNA containing the UUCG tetraloop at temperatures of 25 and 5 degrees C. The high quality of the data, even at 5 degrees C, suggests that the experiments will be of use for the study of RNA molecules that are as large as 30 nucleotides.
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