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Cog1p plays a central role in the organization of the yeast conserved oligomeric Golgi complex.

J Biol Chem. 2005 Jul 29;280(30):27613-23. Epub 2005 Jun 02
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摘要


The conserved oligomeric Golgi (COG) complex is an evolutionarily conserved peripheral membrane oligomeric protein complex that is involved in intra-Golgi protein trafficking. The COG complex is composed of eight subunits that are located in two lobes; Lobe A contains COG1-4, and Lobe B is composed of COG5-8. Both in vivo and in vitro protein-protein interaction techniques were applied to characterize interactions between individual COG subunits. In vitro assays revealed binary interactions between Cog2p and Cog3p, Cog2p and Cog4p, and Cog6p and Cog8p and a strong interaction between Cog5p and Cog7p. The two-hybrid assay confirmed these findings and revealed that Cog1p interacted with subunits from both lobes of the complex. Antibodies to COG subunits were utilized to determine the protein levels and membrane association of COG subunits in yeast delta cog1-8 mutants. As a result, we created a model of the protein-protein interactions within the yeast COG complex and proposed that Cog1p is a bridging subunit between the two COG lobes. In support of this hypothesis, we have demonstrated that Cog1p is required for the stable association between two COG subcomplexes.

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