Tor-mediated induction of autophagy via an Apg1 protein kinase complex

Yoshiaki Kamada, Tomoko Funakoshi, Takahiro Shintani, Kazuya Nagano, Mariko Ohsumi, Yoshinori Ohsumi

Research output: Contribution to journalArticlepeer-review

844 Citations (Scopus)

Abstract

Autophagy is a membrane trafficking to vacuole/lysosome induced by nutrient starvation. In Saccharomyces cerevisiae, Tor protein, a phosphatidylinositol kinase-related kinase, is involved in the repression of autophagy induction by a largely unknown mechanism. Here, we show that the protein kinase activity of Apg1 is enhanced by starvation or rapamycin treatment. In addition, we have also found that Apg13, which binds to and activates Apg1, is hyperphosphorylated in a Tor-dependent manner, reducing its affinity to Apg1. This Apg1-Apg13 association is required for autophagy, but not for the cytoplasm-to-vacuole targeting (Cvt) pathway, another vesicular transport mechanism in which factors essential for autophagy (Apg proteins) are also employed under vegetative growth conditions. Finally, other Apg1-associating proteins, such as Apg17 and Cvt9, are shown to function specifically in autophagy or the Cvt pathway, respectively, suggesting that the Apg1 complex plays an important role in switching between two distinct vesicular transport systems in a nutrient-dependent manner.

Original languageEnglish
Pages (from-to)1507-1513
Number of pages7
JournalJournal of Cell Biology
Volume150
Issue number6
DOIs
Publication statusPublished - 2000 Sep 18
Externally publishedYes

Keywords

  • Cvt
  • Phosphorylation
  • Rapamycin
  • Starvation
  • Yeast

ASJC Scopus subject areas

  • Cell Biology

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