Molecular architecture and functional model of the complete yeast ESCRT-I heterotetramer.
The endosomal sorting complex required for transport-I (ESCRT-I) complex, which is conserved from yeast to humans, directs the lysosomal degradation of ubiquitinated transmembrane proteins and the budding of the HIV virus. Yeast ESCRT-I contains four subunits, Vps23, Vps28, Vps37, and Mvb12. The crystal structure of the heterotetrameric ESCRT-I complex reveals ... a highly asymmetric complex of 1:1:1:1 subunit stoichiometry. The core complex is nearly 18 nm long and consists of a headpiece attached to a 13 nm stalk. The stalk is important for cargo sorting by ESCRT-I and is proposed to serve as a spacer regulating the correct disposition of cargo and other ESCRT components. Hydrodynamic constraints and crystallographic structures were used to generate a model of intact ESCRT-I in solution. The results show how ESCRT-I uses a combination of a rigid stalk and flexible tethers to interact with lipids, cargo, and other ESCRT complexes over a span of approximately 25 nm.
Mesh Terms:
Cell Membrane, Crystallography, X-Ray, Endosomal Sorting Complexes Required for Transport, Endosomes, Models, Molecular, Molecular Structure, Multiprotein Complexes, Protein Conformation, Protein Structure, Quaternary, Saccharomyces cerevisiae, Saccharomyces cerevisiae Proteins, Vesicular Transport Proteins
Cell Membrane, Crystallography, X-Ray, Endosomal Sorting Complexes Required for Transport, Endosomes, Models, Molecular, Molecular Structure, Multiprotein Complexes, Protein Conformation, Protein Structure, Quaternary, Saccharomyces cerevisiae, Saccharomyces cerevisiae Proteins, Vesicular Transport Proteins
Cell
Date: May. 04, 2007
PubMed ID: 17442384
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