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The GTPase dynamin is critically involved in membrane fission during endocytosis. How does dynamin use the energy of GTP hydrolysis for membrane remodeling? By monitoring the ionic permeability through lipid nanotubes (NT), we found that dynamin was capable of squeezing NT to extremely small radii, depending on the NT lipid composition. However, long dynamin scaffolds did not produce fission: instead,...
The GTPase dynamin assembles at the necks of budded vesicles in vivo and functions in membrane fission. We have developed fluid supported bilayers with excess membrane reservoir, (SUPER) templates, to assay vesicle formation and membrane fission. Consistent with previous studies, in the absence of GTP, dynamin assembles in spirals, forming long membrane tubules. GTP addition triggers disassembly,...
Multiple modes of endocytosis require actin-dependent remodeling of the plasma membrane; however, neither the factors linking these processes nor their mechanisms of action are understood. The sorting nexin, SNX9, localizes to clathrin-coated pits where it interacts with dynamin and functions in clathrin-mediated endocytosis. Here, we demonstrate that SNX9 also localizes to actin-rich structures implicated...
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