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    Cell. 1992 Dec 24;71(7):1131-42.

    Endocytosis in yeast: evidence for the involvement of a small GTP-binding protein (Ypt7p).

    Wichmann H, Hengst L, Gallwitz D.

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    Max Planck Institute for Biophysical Chemistry, Department of Molecular Genetics, Germany.

    Abstract

    From the budding yeast S. cerevisiae, we have cloned a gene, YPT7, that encodes a GTP-binding protein belonging to the Ypt family of ras-related proteins. The 208 amino acid protein shares identical effector domain and C-terminal sequences with the mammalian Rab7 protein. YPT7 gene disruption did not impair cellular growth at temperatures ranging from 17 degrees C to 37 degrees C. ypt7 null mutants are characterized by highly fragmented vacuoles and differential defects of vacuolar protein transport and maturation. The uptake of alpha factor pheromone by wild-type and Ypt7p-deficient cells was found to be indistinguishable, but in mutant cells lacking Ypt7p, degradation of the endocytosed pheromone was severely inhibited. Our findings suggest a role of Ypt7p in protein transport between endosome-like compartments.

    PMID:
    1473149
    [PubMed - indexed for MEDLINE]

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