期刊
NATURE STRUCTURAL & MOLECULAR BIOLOGY
卷 16, 期 7, 页码 754-U95出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/nsmb.1621
关键词
-
资金
- NIH [AI051174, GM082545]
Endosomal sorting complexes required for transport-III (ESCRT-III) subunits cycle between two states: soluble monomers and higher-order assemblies that bind and remodel membranes during endosomal vesicle formation, midbody abscission and enveloped virus budding. Here we show that the N-terminal core domains of increased sodium tolerance-1 (IST1) and charged multivesicular body protein-3 (CHMP3) form equivalent four-helix bundles, revealing that IST1 is a previously unrecognized ESCRT-III family member. IST1 and its ESCRT-III binding partner, CHMP1B, both form higher-order helical structures in vitro, and IST1-CHMP1 interactions are required for abscission. The IST1 and CHMP3 structures also reveal that equivalent downstream alpha 5 helices can fold back against the core domains. Mutations within the CHMP3 core-alpha 5 interface stimulate the protein's in vitro assembly and HIV-inhibition activities, indicating that dissociation of the autoinhibitory alpha 5 helix from the core activates ESCRT-III proteins for assembly at membranes.
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