Studies of cargo delivery to the vacuole mediated by autophagosomes in Saccharomyces cerevisiae

Dev Cell. 2002 Dec;3(6):815-24. doi: 10.1016/s1534-5807(02)00359-3.

Abstract

In the yeast Saccharomyces cerevisiae, aminopeptidase I (API), a vacuolar hydrolase, is selectively transported to the vacuole via the autophagosome. API forms a cytosol to vacuole targeting (Cvt) complex in the cytoplasm. The complex is engulfed by the autophagosome under starvation conditions. In this study, the Cvt complex is visualized as a dot in the cytoplasm by fluorescence microscopy with API-GFP. The Cvt complex associates with the preautophagosomal structure (PAS), which plays a central role in autophagosome formation. In a Deltacvt19 mutant, which is specifically defective in API transport, but not in autophagy, the Cvt complex forms normally but never associates with the PAS. This indicates that Cvt19p mediates association between the Cvt complex and the PAS.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Aminopeptidases / metabolism*
  • Autophagy / drug effects
  • Autophagy / physiology*
  • Autophagy-Related Proteins
  • Cytosol / drug effects
  • Cytosol / metabolism
  • Cytosol / ultrastructure
  • Food Deprivation / physiology
  • Green Fluorescent Proteins
  • Luminescent Proteins
  • Microscopy, Fluorescence
  • Mutation / genetics
  • Phagosomes / drug effects
  • Phagosomes / metabolism*
  • Phagosomes / ultrastructure
  • Protein Transport / drug effects
  • Protein Transport / physiology*
  • Receptors, Cell Surface / deficiency*
  • Receptors, Cell Surface / genetics
  • Recombinant Fusion Proteins
  • Saccharomyces cerevisiae / cytology
  • Saccharomyces cerevisiae / drug effects
  • Saccharomyces cerevisiae / metabolism*
  • Saccharomyces cerevisiae Proteins / genetics
  • Saccharomyces cerevisiae Proteins / metabolism*
  • Signal Transduction / drug effects
  • Signal Transduction / physiology
  • Sirolimus / pharmacology
  • Transport Vesicles / drug effects
  • Transport Vesicles / metabolism
  • Transport Vesicles / ultrastructure
  • Vacuoles / drug effects
  • Vacuoles / metabolism*
  • Vacuoles / ultrastructure
  • Vesicular Transport Proteins*

Substances

  • ATG19 protein, S cerevisiae
  • Autophagy-Related Proteins
  • Luminescent Proteins
  • Receptors, Cell Surface
  • Recombinant Fusion Proteins
  • Saccharomyces cerevisiae Proteins
  • Vesicular Transport Proteins
  • Green Fluorescent Proteins
  • Aminopeptidases
  • APE1 protein, S cerevisiae
  • Sirolimus