Polymer-induced tubulation in lipid vesicles

Details Polymer-induced tubulation in lipid vesicles Polymer-induced tubulation in lipid vesicles

2008-04-21

arxiv.org/abs/0804.3329v1

Phys. Rev. Lett. 100, 158103 (2008)

Biology

Quantitative Biology

Subcellular Processes

Scientific paper

10.1103/PhysRevLett.100.158103

A mechanism of extraction of tubular membranes from a lipid vesicle is presented. A concentration gradient of anchoring amphiphilic polymers generates tubes from bud-like vesicle protrusions. We explain this mechanism in the framework of the Canham-Helfrich model. The energy profile is analytically calculated and a tube with a fixed length, corresponding to an energy minimum, is obtained in a certain regime of parameters. Further, using a phase-field model, we corroborate these results numerically. We obtain the growth of tubes when a polymer source is added, and the bud-like shape after removal of the polymer source, in accordance with recent experimental results.

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