Non-Markovian fluctuations in Markovian models of protein dynamics

Details Non-Markovian fluctuations in Markovian models of protein dynamics Non-Markovian fluctuations in Markovian models of protein dynamics

2008-10-13

arxiv.org/abs/0810.2232v1

Physics

Condensed Matter

Statistical Mechanics

4 pages, 2 figures

Scientific paper

Recent experiments using fluorescence spectroscopy have been able to probe the dynamics of conformational fluctuations in proteins. The fluctuations are Gaussian but do not decay exponentially, and are therefore, non-Markovian. We present a theory where non-Markovian fluctuation dynamics emerges naturally from the superposition of the Markovian fluctuations of the normal modes of the protein. A Rouse-like dynamics of the normal modes provides very good agreement to the experimentally measured correlation functions. We provide simple scaling arguments rationalising our results.

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