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• W2038595868 abstract "The fusion peptide of the HIV fusion protein gp41 is required for viral fusion and entry into a host cell, but it is unclear whether this 23-residue peptide can fuse model membranes. We address this question for model membrane vesicles in the presence and absence of aggregating concentrations of poly(ethylene glycol) (PEG). PEG had no effect on the physical properties of peptide bound to membranes or free in solution. We tested for fusion of both highly curved and uncurved PC/PE/SM/CH (35:30:15:20 mol %) vesicles and highly curved PC/PE/CH (1:1:1) vesicles treated with peptide in the presence and absence of PEG. Fusion was never observed in the absence of PEG, although high peptide concentrations led to aggregation and rupture, especially in unstable PC/PE/CH (1:1:1) vesicles. When 5 wt % PEG was present to aggregate vesicles, peptide enhanced the rate of lipid mixing between curved PC/PE/SM/CH vesicles in proportion to the peptide concentration, with this effect leveling off at peptide/lipid (P/L) ratios approximately 1:200. Peptide produced an even larger effect on the rate of contents mixing but inhibited contents mixing at P/L ratios >1:200. No fusion enhancement was seen with uncurved vesicles. The rate of fusion was also enhanced by the presence of hexadecane, and peptide-induced rate enhancement was not observed in the presence of hexadecane. We conclude that gp41 fusion peptide does not induce vesicle fusion at subrupturing concentrations but can enhance fusion between highly curved vesicles induced to fuse by PEG. The different effects of peptide on the rates of lipid mixing and fusion pore formation suggest that, while gp41 fusion peptide does affect hemifusion, it mainly affects pore formation." @default.
• W2038595868 created "2016-06-24" @default.
• W2038595868 creator A5010382944 @default.
• W2038595868 creator A5067574257 @default.
• W2038595868 date "2002-08-07" @default.
• W2038595868 modified "2023-10-10" @default.
• W2038595868 title "Influence of gp41 Fusion Peptide on the Kinetics of Poly(ethylene glycol)-Mediated Model Membrane Fusion" @default.
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• W2038595868 doi "https://doi.org/10.1021/bi020269q" @default.
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