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Reference: Harding TM, et al. (1996) Genetic and phenotypic overlap between autophagy and the cytoplasm to vacuole protein targeting pathway. J Biol Chem 271(30):17621-4

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Abstract


We have explored the phenotypic and genetic overlap between autophagocytosis and cytoplasm to vacuole targeting in the yeast Saccharomyces cerevisiae. Complementation analysis was performed with mutants in each of these groups (aut and cvt, respectively), and three complementation groups were found to overlap. Also, most of the unique aut mutants accumulated precursor aminopeptidase I in the cytoplasm, while maintaining wild type kinetics and maturation of proteins targeted to the vacuole via the secretory pathway. The majority of the non-overlapping cvt mutants were found to be at least partially defective in autophagy. Some mutants in each group, however, appear to be only marginally affected in the other phenotype, implying that these pathways only partially overlap. We propose that import of aminopeptidase I into the vacuole shares a number of components required for bulk autophagocytosis, but is made specific, saturable, and constitutive by the presence of a receptor or other interacting protein(s).

Reference Type
Journal Article
Authors
Harding TM, Hefner-Gravink A, Thumm M, Klionsky DJ
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