Does Electric Friction Matter in Living Cells?

Does Electric Friction Matter in Living Cells?
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DOI:
10.1021/acs.jpcb.1c02783
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发表时间:
2021-06-17
期刊:
The journal of physical chemistry. B
影响因子:
--
通讯作者:
Hofmann H
Hofmann H
中科院分区:
其他
文献类型:
--
作者:
Makarov DE;Hofmann H

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The thermal motion of charged proteins causes randomly fluctuating electric fields inside cells. According to the fluctuation–dissipation theorem, there is an additional friction force associated with such fluctuations. However, the impact of these fluctuations on the diffusion and dynamics of proteins in the cytoplasm is unclear. Here, we provide an order-of-magnitude estimate of this effect by treating electric field fluctuations within a generalized Langevin equation model with a time-dependent friction memory kernel. We find that electric friction is generally negligible compared to solvent friction. However, a significant slowdown of protein diffusion and dynamics is expected for biomolecules with high net charges such as intrinsically disordered proteins and RNA. The results show that direct contacts between biomolecules in a cell are not necessarily required to alter their dynamics.
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