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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

The Ccz1 protein interacts with Ypt7 GTPase during fusion of multiple transport intermediates with the vacuole in S. cerevisiae.

Previously we have shown that the Saccharomyces cerevisiae CCZ1 (YBR131w) gene encodes a protein involved in protein trafficking. Deletion of this gene leads to fragmentation of the vacuole typical of the class B vps mutants. Genetic and biochemical data indicated that Ccz1p is required for fusion of various transport intermediates with the vacuole. Here we present data indicating that CCZ1 is a close partner of the YPT7 gene, which encodes Rab GTPase and is required for fusion of transport vesicles to vacuole and homotypic vacuole fusion. We isolated extragenic suppressors of CCZ1 deletion. All these suppressors belong to one complementation group and correspond to mutated alleles of the YPT7 gene. The mutated residues are located in two Ypt7p domains responsible for guanine binding. These data suggest that Ccz1p and Ypt7p interact physically. Coimmunoprecipitation experiments provide direct evidence that this indeed is the case. A possible mechanism of Ccz1p action is discussed.[1]


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