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A 0.2 μs molecular dynamics simulation of ubiquitin in water is presented, which allows us to assess both the global tumbling in solution and the internal dynamics. The latter reveals slow motions outside the classical NMR timewindow, in agreement with recent RDC and cross-correlation measurements. Analysis of back-calculated relaxation rates using the classical NMR model-free approach reproduces the amplitudes of internal motions expressed in the order parameter, while it severely underestimates the corresponding time scales present in the simulation.

NMR Relaxation and Internal Dynamics of Ubiquitin from a 0.2 μs MD Simulation