|
Hokkaido University Collection of Scholarly and Academic Papers >
Faculty of Pharmaceutical Sciences >
Peer-reviewed Journal Articles, etc >
Transport of phosphatidylinositol 3-phosphate into the vacuole via autophagic membranes in Saccharomyces cerevisiae
| Title: | Transport of phosphatidylinositol 3-phosphate into the vacuole via autophagic membranes in Saccharomyces cerevisiae |
| Authors: | Obara, Keisuke Browse this author | | Noda, Takeshi Browse this author | | Niimi, Kaori Browse this author | | Ohsumi, Yoshinori Browse this author |
| Issue Date: | May-2008 |
| Publisher: | Molecular Biology Society of Japan |
| Journal Title: | Genes to Cells |
| Volume: | 13 |
| Issue: | 6 |
| Start Page: | 537 |
| End Page: | 547 |
| Publisher DOI: | 10.1111/j.1365-2443.2008.01188.x |
| Abstract: | Vps34, the sole PtdIns 3-kinase in yeast, is essential for autophagy. Here, we show that the lipidkinase 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 discussthe function of PtdIns(3)P in autophagy. |
| Rights: | The definitive version is available at wileyonlinelibrary.com |
| Type: | article (author version) |
| URI: | http://hdl.handle.net/2115/45482 |
| Appears in Collections: | 薬学研究院 (Faculty of Pharmaceutical Sciences) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
|
Submitter: 小原 圭介
|
