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Human ESCRT-III polymers assemble on positively curved membranes and induce helical membrane tube formation

Abstract : Endosomal sorting complexes for transport-III (ESCRT-III) assemble in vivo onto membranes with negative Gaussian curvature. How membrane shape influences ESCRT-III polymerization and how ESCRT-III shapes membranes is yet unclear. Human core ESCRT-III proteins, CHMP4B, CHMP2A, CHMP2B and CHMP3 are used to address this issue in vitro by combining membrane nanotube pulling experiments, cryo-electron tomography and AFM. We show that CHMP4B filaments preferentially bind to flat membranes or to tubes with positive mean curvature. Both CHMP2B and CHMP2A/CHMP3 assemble on positively curved membrane tubes. Combinations of CHMP4B/CHMP2B and CHMP4B/CHMP2A/CHMP3 are recruited to the neck of pulled membrane tubes and reshape vesicles into helical "corkscrew-like" membrane tubes. Sub-tomogram averaging reveals that the ESCRT-III filaments assemble parallel and locally perpendicular to the tube axis, highlighting the mechanical stresses imposed by ESCRT-III. Our results underline the versatile membrane remodeling activity of ESCRT-III that may be a general feature required for cellular membrane remodeling processes.
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Contributor : Aurélie Bertin Connect in order to contact the contributor
Submitted on : Friday, May 29, 2020 - 3:54:45 PM
Last modification on : Tuesday, January 25, 2022 - 3:09:55 AM

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Aurélie Bertin, Nicola de Franceschi, Eugenio de la Mora, Sourav Maiti, Maryam Alqabandi, et al.. Human ESCRT-III polymers assemble on positively curved membranes and induce helical membrane tube formation. Nature Communications, Nature Publishing Group, 2020, ⟨10.1038/s41467-020-16368-5⟩. ⟨hal-02651230⟩

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