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pep5 mutants of Saccharomyces cerevisiae accumulate inactive precursors to the vacuolar hydrolases. In addition, they show a vestigial vacuole morphology and a sensitivity to growth on media containing excess divalent cations. This pleiotropic phenotype observed for pep5::TRP1 mutants is partially suppressed by the vps8-200 allele. pep5::TRP1 vps8-200 mutants show near wild-type levels of mature-sized soluble vacuolar hydrolases, growth on zinc-containing medium, and a more “wild-type” vacuolar morphology; however, aminopeptidase I and alkaline phosphatase accumulate as precursors. These data suggest that Pep5p is a bifunctional protein and that the TRP1 insertion does not eliminate function, but results in a shorter peptide that can interact with Vps8-200p, allowing for partial function. vps8 deletion/disruption mutants contain a single enlarged vacuole. This genetic interaction was unexpected, since Pep5p was thought to interact more directly with the vacuole, and Vps8p is thought to play a role in transport between the Golgi complex and the prevacuolar compartment. The data are consistent with Pep5p functioning both at the site of Vps8p function and more closely proximal to the vacuole. They also provide evidence that the three transport pathways to the vacuole either converge or share gene products at late step(s) in the pathway(s).

Genetic Interaction With vps8-200 Allows Partial Suppression of the Vestigial Vacuole Phenotype Caused by a pep5 Mutation in Saccharomyces cerevisiae