Dynamic subunit turnover in ESCRT-III assemblies is regulated by Vps4 to mediate membrane remodelling during cytokinesis.
Nat Cell Biol
; 19(7): 787-798, 2017 Jul.
Article
em En
| MEDLINE
| ID: mdl-28604678
ABSTRACT
The endosomal sorting complex required for transport (ESCRT)-III mediates membrane fission in fundamental cellular processes, including cytokinesis. ESCRT-III is thought to form persistent filaments that over time increase their curvature to constrict membranes. Unexpectedly, we found that ESCRT-III at the midbody of human cells rapidly turns over subunits with cytoplasmic pools while gradually forming larger assemblies. ESCRT-III turnover depended on the ATPase VPS4, which accumulated at the midbody simultaneously with ESCRT-III subunits, and was required for assembly of functional ESCRT-III structures. In vitro, the Vps2/Vps24 subunits of ESCRT-III formed side-by-side filaments with Snf7 and inhibited further polymerization, but the growth inhibition was alleviated by the addition of Vps4 and ATP. High-speed atomic force microscopy further revealed highly dynamic arrays of growing and shrinking ESCRT-III spirals in the presence of Vps4. Continuous ESCRT-III remodelling by subunit turnover might facilitate shape adaptions to variable membrane geometries, with broad implications for diverse cellular processes.
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Endossomos
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ATPases Vacuolares Próton-Translocadoras
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Citocinese
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Complexos Endossomais de Distribuição Requeridos para Transporte
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Membranas Intracelulares
Idioma:
En
Ano de publicação:
2017
Tipo de documento:
Article