Gamma-COP appendage domain - structure and function.

COPI-coated vesicles mediate retrograde transport from the Golgi back to the ER and intra-Golgi transport. The cytosolic precursor of the COPI coat, the heptameric coatomer complex, can be thought of as composed of two subcomplexes. The first consists of the beta-, gamma-, delta- and zeta-COP subunits which are distantly homologous ...
to AP clathrin adaptor subunits. The second consists of the alpha-, beta'- and epsilon-COP subunits. Here, we present the structure of the appendage domain of gamma-COP and show that it has a similar overall fold as the alpha-appendage of AP2. Again, like the alpha-appendage the gamma-COP appendage possesses a single protein/protein interaction site on its platform subdomain. We show that in yeast this site binds to the ARFGAP Glo3p, and in mammalian gamma-COP this site binds to a Glo3p orthologue, ARFGAP2. On the basis of mutations in the yeast homologue of gamma-COP, Sec21p, a second binding site is proposed to exist on the gamma-COP appendage that interacts with the alpha,beta',epsilon COPI subcomplex.
Mesh Terms:
ADP-Ribosylation Factors, Amino Acid Sequence, Animals, Binding Sites, Coat Protein Complex I, Crystallography, X-Ray, Fungal Proteins, GTPase-Activating Proteins, Humans, Macromolecular Substances, Models, Molecular, Molecular Sequence Data, Protein Binding, Protein Conformation, Protein Folding, Protein Structure, Tertiary, Protein Subunits, Rats, Sequence Alignment, Transport Vesicles
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Date: Feb. 01, 2004
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