RT Journal Article
SR Electronic
T1 Quantifying the Heat Dissipation from Molecular Motor’s Transport Properties in Nonequilibrium Steady States
JF bioRxiv
FD Cold Spring Harbor Laboratory
SP 095042
DO 10.1101/095042
A1 Wonseok Hwang
A1 Changbong Hyeon
YR 2016
UL http://biorxiv.org/content/early/2016/12/17/095042.abstract
AB Theoretical analysis, which maps single molecule time trajectories of a molecular motor onto unicyclic Markov processes, allows us to evaluate the heat dissipated from the motor and to elucidate its dependence on the mean velocity and diffusivity. Unlike passive Brownian particles in equilibrium, the velocity and diffusion constant of molecular motors are closely inter-related to each other. In particular, our study makes it clear that the increase of diffusivity with the heat production is a natural outcome of active particles, which is reminiscent of the recent experimental premise that the diffusion of an exothermic enzyme is enhanced by the heat released from its own catalytic turnover. Compared with freely diffusing exothermic enzymes, kinesin-1 whose dynamics is confined on one-dimensional tracks is highly efficient in transforming conformational fluctuations into a locally directed motion, thus displaying a significantly higher enhancement in diffusivity with its turnover rate. Putting molecular motors and freely diffusing enzymes on an equal footing, our study offers thermodynamic basis to understand the heat enhanced self-diffusion of exothermic enzymes.