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J Biol Chem, Vol. 273, Issue 7, 3963-3966, February 13, 1998
From the National Institute for Basic Biology, Department of Cell
Biology, National Institute for Basic Biology, Nishigonaka 38, Myodaijicho, Okazaki 444, Japan
Autophagy is a bulk protein degradation process
that is induced by starvation. The control mechanism for induction of
autophagy is not well understood. We found that Tor, a
phosphatidylinositol kinase homologue, is involved in the control of
autophagy in the yeast, Saccharomyces cerevisiae. When
rapamycin, an inhibitor of Tor function, is added, autophagy is induced
even in cells growing in nutrient-rich medium. A temperature-sensitive
tor mutant also leads to induction of autophagy at a
nonpermissive temperature. These results indicate that Tor negatively
regulates the induction of autophagy. Tor is the first molecule that is
identified as a pivotal player in the starvation-signaling pathway of
autophagy. Furthermore, we found that a high concentration of cAMP is
inhibitory for induction of autophagy. APG gene products
are involved in autophagy induced by starvation. Autophagy was not
induced in apg mutants in the presence of rapamycin,
indicating that the site of action of Tor is upstream of those of Apg
proteins. In nutrient-rich medium, Apg proteins are involved also in
the transport of aminopeptidase I from the cytosol to the vacuole. Tor
may act to switch Apg function between autophagy and transport of
aminopeptidase I.
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