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• W2021531529 abstract "Experiments have shown that the depletion of polymer in the region between two apposed (contacting or nearly contacting) bilayer membranes leads to fusion. In this paper we show theoretically that the addition of nonadsorbing polymer in solution can promote lateral contraction and phase separation of the lipids in the outer monolayers of the membranes exposed to the polymer solution, i.e., outside the contact zone. This initial phase coexistence of higher- and lower-density lipid domains in the outer monolayer results in surface tension gradients in the outer monolayer. Initially, the inner layer lipids are not exposed to the polymer solution and remain in their original “unstressed” state. The differential stresses on the bilayers give rise to a Marangoni flow of lipid from the outer monolayers in the “contact zone” (where there is little polymer and hence a uniform phase) to the outer monolayers in the “reservoir” (where initially the surface tension gradients are large due to the polymer-induced phase separation). As a result, the low-density domains of the outer monolayers in the contact zone expose their hydrophobic chains, and those of the inner monolayers, to the solvent and to each other across the narrow water gap, allowing fusion to occur via a hydrophobic interaction. More generally, this type of mechanism suggests that fusion and other intermembrane interactions may be triggered by Marangoni flows induced by surface tension gradients that provide “action at a distance” far from the fusion or interaction zone." @default.
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• W2021531529 date "2001-08-01" @default.
• W2021531529 modified "2023-09-27" @default.
• W2021531529 title "Polymer-Induced Membrane Contraction, Phase Separation, and Fusion via Marangoni Flow" @default.
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• W2021531529 doi "https://doi.org/10.1016/s0006-3495(01)75730-x" @default.
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