Lateral diffusion induced by active proteins in a biomembrane

Yuto Hosaka, Kento Yasuda, Ryuichi Okamoto, and Shigeyuki Komura
Phys. Rev. E 95, 052407 – Published 16 May 2017

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.

  • Figure
  • Figure
  • Figure
  • Figure
  • Received 14 March 2017

DOI:https://doi.org/10.1103/PhysRevE.95.052407

©2017 American Physical Society

Physics Subject Headings (PhySH)

Physics of Living SystemsPolymers & Soft MatterStatistical Physics & Thermodynamics

Authors & Affiliations

Yuto Hosaka, Kento Yasuda, Ryuichi Okamoto, and Shigeyuki Komura*

  • Department of Chemistry, Graduate School of Science and Engineering, Tokyo Metropolitan University, Tokyo 192-0397, Japan

  • *komura@tmu.ac.jp

Article Text (Subscription Required)

Click to Expand

References (Subscription Required)

Click to Expand
Issue

Vol. 95, Iss. 5 — May 2017

Reuse & Permissions
Access Options
Author publication services for translation and copyediting assistance advertisement

Authorization Required


×
×

Images

×

Sign up to receive regular email alerts from Physical Review E

Log In

Cancel
×

Search


Article Lookup

Paste a citation or DOI

Enter a citation
×