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• W2000847543 startingPage "2287" @default.
• W2000847543 abstract "The productive fusion pore in membrane fusion is generally thought to be toroidally shaped. Theoretical studies and recent experiments suggest that its formation, in some scenarios, may be preceded by an initial pore formed near the rim of the extended hemifusion diaphragm (HD), a rim-pore. This rim-pore is characterized by a nontoroidal shape that changes with size. To determine this shape as well as the free energy along the pathway of rim-pore expansion, we derived a simple analytical free energy model. We argue that dilation of HD material via expansion of a rim-pore is favored over a regular, circular pore. Further, the expanding rim-pore faces a free energy barrier that linearly increases with HD size. In contrast, the tension required to expand the rim-pore decreases with HD size. Pore flickering, followed by sudden opening, occurs when the tension in the HD competes with the line energy of the rim-pore, and the rim-pore reaches its equilibrium size before reaching the critical pore size. The experimental observation of flickering and closing fusion pores (kiss-and-run) is very well explained by the observed behavior of rim-pores. Finally, the free energy landscape of rim-pore expansion/HD dilation may very well explain why some cellular fusion reactions, in their attempt to minimize energetic costs, progress via alternative formation and dilation of microscopic hemifusion intermediates." @default.
• W2000847543 created "2016-06-24" @default.
• W2000847543 creator A5045212144 @default.
• W2000847543 creator A5051549963 @default.
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• W2000847543 date "2014-11-01" @default.
• W2000847543 modified "2023-09-26" @default.
• W2000847543 title "Free Energy Landscape of Rim-Pore Expansion in Membrane Fusion" @default.
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• W2000847543 doi "https://doi.org/10.1016/j.bpj.2014.08.022" @default.
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