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TitleMultiple modes of endophilin-mediated conversion of lipid vesicles into coated tubes: implications for synaptic endocytosis.
Journal, issue, pagesJ Biol Chem, Vol. 285, Issue 30, Page 23351-23358, Year 2010
Publish dateJul 23, 2010
AuthorsNaoko Mizuno / Christine C Jao / Ralf Langen / Alasdair C Steven /
PubMed AbstractEndophilin A1 is a BAR (Bin/amphiphysin/Rvs) protein abundant in neural synapses that senses and induces membrane curvature, contributing to neck formation in presynaptic endocytic vesicles. To ...Endophilin A1 is a BAR (Bin/amphiphysin/Rvs) protein abundant in neural synapses that senses and induces membrane curvature, contributing to neck formation in presynaptic endocytic vesicles. To investigate its role in membrane remodeling, we used cryoelectron microscopy to characterize structural changes induced in lipid vesicles by exposure to endophilin. The vesicles convert rapidly to coated tubules whose morphology reflects the local concentration of endophilin. Their diameters and curvature resemble those of synaptic vesicles in situ. Three-dimensional reconstructions of quasicylindrical tubes revealed arrays of BAR dimers, flanked by densities that we equate with amphipathic helices whose folding and membrane insertion were attested by EPR. We also observed the compression of bulbous coated tubes into 70-A-wide cylindrical micelles, which appear to mimic the penultimate (hemi-fission) stage of endocytosis. Our findings suggest that the adaptability of endophilin-lipid interactions underlies dynamic changes of endocytic membranes.
External linksJ Biol Chem / PubMed:20484046 / PubMed Central
MethodsEM (helical sym.)
Resolution21.0 Å
Structure data

EMDB-2018:
CryoEM reconstruction of endophilin N-BAR tubes
Method: EM (helical sym.) / Resolution: 21.0 Å

Source
  • Rattus norvegicus (Norway rat)

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