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Spicules and the effect of rigid rods on enclosing membrane tubes
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UNSPECIFIED (2005) Spicules and the effect of rigid rods on enclosing membrane tubes. PHYSICAL REVIEW LETTERS, 95 (23). -. doi:10.1103/PhysRevLett.95.238101 ISSN 0031-9007.
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Official URL: http://dx.doi.org/10.1103/PhysRevLett.95.238101
Abstract
Membrane tubes (spicules) arise in cells, or artificial membranes, in the nonlinear deformation regime due to, e.g., the growth of microtubules, actin filaments, or sickle hemoglobin fibers towards a membrane. We calculate the axial force f exerted by the tube, and its average radius, taking into account steric interactions between the fluctuating membrane and the enclosed rod. We find a smooth crossover of the axial force between f similar to root sigma and f similar to sigma as the membrane tension sigma increases and the tube radius shrinks. This crossover occurs around the most physiologically relevant membrane tensions. Our work may be important in (i) interpreting experiments in which axial force is related to the tube radius or membrane tension, and (ii) constructing dynamical theories for biopolymer growth in narrow tubes where these fluctuation effects control the tube radius.
| Item Type: | Journal Article | ||||
|---|---|---|---|---|---|
| Subjects: | Q Science > QC Physics | ||||
| Journal or Publication Title: | PHYSICAL REVIEW LETTERS | ||||
| Publisher: | AMERICAN PHYSICAL SOC | ||||
| ISSN: | 0031-9007 | ||||
| Official Date: | 2 December 2005 | ||||
| Dates: |
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| Volume: | 95 | ||||
| Number: | 23 | ||||
| Number of Pages: | 4 | ||||
| Page Range: | - | ||||
| DOI: | 10.1103/PhysRevLett.95.238101 | ||||
| Publication Status: | Published |
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