Lateral diffusion induced by active proteins in a biomembrane

Yuto Hosaka, Kento Yasuda, Ryuichi Okamoto, Shigeyuki Komura

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

We discuss the hydrodynamic collective effects due to active protein molecules that are immersed in lipid bilayer membranes and modeled as stochastic force dipoles. We specifically take into account the presence of the bulk solvent that surrounds the two-dimensional fluid membrane. Two membrane geometries are considered: the free membrane case and the confined membrane case. Using the generalized membrane mobility tensors, we estimate the active diffusion coefficient and the drift velocity as a function of the size of a diffusing object. The hydrodynamic screening lengths distinguish the two asymptotic regimes of these quantities. Furthermore, the competition between the thermal and nonthermal contributions in the total diffusion coefficient is characterized by two length scales corresponding to the two membrane geometries. These characteristic lengths describe the crossover between different asymptotic behaviors when they are larger than the hydrodynamic screening lengths.

Original languageEnglish
Number of pages1
JournalPhysical review. E
Volume95
Issue number5-1
DOIs
Publication statusPublished - May 1 2017
Externally publishedYes

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ASJC Scopus subject areas

  • Statistical and Nonlinear Physics
  • Statistics and Probability
  • Condensed Matter Physics

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