ESCRT-II, an endosome-associated complex required for protein sorting: crystal structure and interactions with ESCRT-III and membranes.

ESCRT-I, -II, and -III protein complexes are sequentially recruited to endosomal membranes, where they orchestrate protein sorting and MVB biogenesis. In addition, they play a critical role in retrovirus budding. Structural understanding of ESCRT interaction networks is largely lacking. The 3.6 A structure of the yeast ESCRT-II core presented here ...
reveals a trilobal complex containing two copies of Vps25, one copy of Vps22, and the C-terminal region of Vps36. Unexpectedly, the entire ESCRT-II core consists of eight repeats of a common building block, a "winged helix" domain. Two PPXY-motifs from Vps25 are involved in contacts with Vps22 and Vps36, and their mutation leads to ESCRT-II disruption. We show that purified ESCRT-II binds directly to the Vps20 component of ESCRT-III. Surprisingly, this binding does not require the protruding N-terminal coiled-coil of Vps22. Vps25 is the chief subunit responsible for Vps20 recruitment. This interaction dramatically increases binding of both components to lipid vesicles in vitro.
Mesh Terms:
Amino Acid Motifs, Amino Acid Sequence, Carrier Proteins, Crystallography, X-Ray, Endosomal Sorting Complexes Required for Transport, Endosomes, Escherichia coli, Liposomes, Membrane Proteins, Models, Molecular, Molecular Sequence Data, Mutation, Protein Binding, Protein Structure, Quaternary, Protein Structure, Secondary, Protein Structure, Tertiary, Protein Subunits, Protein Transport, Recombinant Fusion Proteins, Saccharomyces cerevisiae, Saccharomyces cerevisiae Proteins, Sequence Homology, Amino Acid, Vesicular Transport Proteins
Dev. Cell
Date: Oct. 01, 2004
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