Reference: Yu X, et al. (2012) A structure-based mechanism for Arf1-dependent recruitment of coatomer to membranes. Cell 148(3):530-42

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Abstract

Budding of COPI-coated vesicles from Golgi membranes requires an Arf family G protein and the coatomer complex recruited from cytosol. Arf is also required with coatomer-related clathrin adaptor complexes to bud vesicles from the trans-Golgi network and endosomal compartments. To understand the structural basis for Arf-dependent recruitment of a vesicular coat to the membrane, we determined the structure of Arf1 bound to the gammazeta-COP subcomplex of coatomer. Structure-guided biochemical analysis reveals that a second Arf1-GTP molecule binds to betadelta-COP at a site common to the gamma- and beta-COP subunits. The Arf1-binding sites on coatomer are spatially related to PtdIns4,5P(2)-binding sites on the endocytic AP2 complex, providing evidence that the orientation of membrane binding is general for this class of vesicular coat proteins. A bivalent GTP-dependent binding mode has implications for the dynamics of coatomer interaction with the Golgi and for the selection of cargo molecules.CI - Copyright (c) 2012 Elsevier Inc. All rights reserved.

Reference Type
Journal Article | Research Support, Non-U.S. Gov't
Authors
Yu X, Breitman M, Goldberg J
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