Abstract
Simulation of a virus-like particle reveals persistent oscillation about a free-energy minimizing structure. For an icosahedral structure of 12 human papillomavirus (HPV) L1 protein pentamers, the period is about 70 picoseconds and has amplitude of about 4Å at 300K and pH 7. The pentamers move radially and out-of-phase with their neighbors. As temperature increases the amplitude and period decrease. Since the dynamics are shown to be friction-dominated and free-energy driven, the oscillations are noninertial. These anomalous oscillations are an apparent violation of the Second Law mediated by fluctuations accompanying nanosystem behavior.
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