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001045037 1001_ $$0P:(DE-Juel1)188440$$aHudina, Esther$$b0$$eCorresponding author
001045037 245__ $$aThe bacterial ESCRT-III PspA rods thin lipid tubules and increase membrane curvature through helix α0 interactions
001045037 260__ $$aWashington, DC$$bNational Acad. of Sciences$$c2025
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001045037 520__ $$aThe phage shock protein A (PspA), a bacterial member of the endosomal sorting complexes required for transport (ESCRT)-III superfamily, forms rod-shaped helical assemblies that internalize membrane tubules. The N-terminal helix α0 of PspA (and other ESCRT-III members) has been suggested to act as a membrane anchor; the detailed mechanism, however, of how it binds to membranes and eventually triggers membrane fusion and/or fission events remains unclear. By solving a total of 15 cryoelectron microscopy (cryo-EM) structures of PspA and a truncation lacking the N-terminal helix α0 in the presence of Escherichia coli polar lipid membranes, we show in molecular detail how PspA interacts with and remodels membranes: Binding of the N-terminal helix α0 in the outer tubular membrane leaflet induces membrane curvature, supporting membrane tubulation by PspA. Detailed molecular dynamics simulations and free energy computations of interactions between the helix α0 and negatively charged membranes suggest a compensating mechanism between helix-membrane interactions and the energy contributions required for membrane bending. The energetic considerations are in line with the membrane structures observed in the cryo-EM images of tubulated membrane vesicles, fragmented vesicles inside tapered PspA rods, and shedded vesicles emerging at the thinner PspA rod ends. Our results provide insights into the molecular determinants and a potential mechanism of vesicular membrane remodeling mediated by a member of the ESCRT-III superfamily. 
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001045037 7001_ $$0P:(DE-Juel1)187014$$aSchott-Verdugo, Stephan$$b1
001045037 7001_ $$0P:(DE-Juel1)181012$$aJunglas, Benedikt$$b2
001045037 7001_ $$00009-0003-6812-0631$$aKutzner, Mirka$$b3
001045037 7001_ $$0P:(DE-Juel1)131979$$aRitter, Ilona$$b4
001045037 7001_ $$aHellmann, Nadja$$b5
001045037 7001_ $$00000-0003-4517-6387$$aSchneider, Dirk$$b6
001045037 7001_ $$0P:(DE-Juel1)172663$$aGohlke, Holger$$b7
001045037 7001_ $$0P:(DE-Juel1)173949$$aSachse, Carsten$$b8
001045037 773__ $$0PERI:(DE-600)1461794-8$$a10.1073/pnas.2506286122$$gVol. 122, no. 32, p. e2506286122$$n32$$pe2506286122$$tProceedings of the National Academy of Sciences of the United States of America$$v122$$x0027-8424$$y2025
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