protein dynamics describes structural fluctuations and transitions between conformations of a protein. Functional interpretation needs the populations and timescales of these transitions, not merely a list of static structures.
The distribution of molecular conformations and their interconversion in an enzyme under specified chemical conditions. A minor population can be functionally important even when a mean structure changes little.
A model-based measure of the amplitude of internal bond-vector motion inferred from suitable relaxation measurements. It requires assumptions about overall tumbling and timescale separation.

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