Abstract
Recent experiments using fluorescence spectroscopy have been able to probe the dynamicsof conformational fluctuations in proteins. The fluctuations are Gaussian but do not decayexponentially, and are therefore non-Markovian. We present a theory where non-Markovianfluctuation dynamics emerges naturally from the superposition of the Markovianfluctuations of the normal modes of the protein. A Rouse-like dynamics of thenormal modes provides very good agreement with the experimentally measuredcorrelation functions. We provide simple scaling arguments rationalizing our results.
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