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Genes to Cells (2008) 13, 537-547. doi:10.1111/j.1365-2443.2008.01188.x
© 2008 Blackwell Publishing or its licensors

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Transport of phosphatidylinositol 3-phosphate into the vacuole via autophagic membranes in Saccharomyces cerevisiae

Keisuke Obara1,a, Takeshi Noda2,a, Kaori Niimi1 and Yoshinori Ohsumi1,*

1 Department of Cell Biology, National Institute for Basic Biology, Okazaki 444-8585, Japan
2 Department of Cellular Regulation, Research Institute for Microbial Diseases, Osaka University, Suita, Osaka 565-0871, Japan

Vps34, the sole PtdIns 3-kinase in yeast, is essential for autophagy. Here, we show that the lipid-kinase activity of Vps34 is required for autophagy, implying an essential role of its product PtdIns(3)P. The protein-kinase activity of Vps15, a regulatory subunit of the PtdIns 3-kinase complex, is also required for efficient autophagy. We monitored the distribution of PtdIns(3)P in living cells using a specific indicator, the 2xFYVE domain derived from mammalian Hrs. PtdIns(3)P was abundant at endosomes and on the vacuolar membrane during logarithmic growth phase. Under starvation conditions, we observed massive transport of PtdIns(3)P into the vacuole. This accumulation was dependent on the membrane dynamics of autophagy. Notably, PtdIns(3)P was highly enriched and delivered into the vacuole as a component of autophagosome membranes but not as a cargo enclosed within them, implying direct involvement of this phosphoinositide in autophagosome formation. We also found a possible enrichment of PtdIns(3)P on the inner autophagosomal membrane compared to the outer membrane. Based on these results we discuss the function of PtdIns(3)P in autophagy.


Communicated by: Akihiko Nakano

aThese authors contributed equally to this work

* Correspondence: Email: yohsumi{at}nibb.ac.jp




This article has been cited by other articles:


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The Atg18-Atg2 Complex Is Recruited to Autophagic Membranes via Phosphatidylinositol 3-Phosphate and Exerts an Essential Function
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Physiological pH and Acidic Phospholipids Contribute to Substrate Specificity in Lipidation of Atg8
J. Biol. Chem., August 8, 2008; 283(32): 21847 - 21852.
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