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Intracellular Trafficking Pathway of Yeast Long-chain Base Kinase Lcb4, from Its Synthesis to Its Degradation

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Title: Intracellular Trafficking Pathway of Yeast Long-chain Base Kinase Lcb4, from Its Synthesis to Its Degradation
Authors: Iwaki, Soichiro Browse this author
Sano, Takamitsu Browse this author →KAKEN DB
Takagi, Tomoko Browse this author
Osumi, Masako Browse this author
Kihara, Akio Browse this author →KAKEN DB
Igarashi, Yasuyuki Browse this author →KAKEN DB
Issue Date: 28-Sep-2007
Publisher: American Society for Biochemistry and Molecular Biology
Journal Title: Journal of Biological Chemistry
Volume: 282
Issue: 39
Start Page: 28485
End Page: 28492
Publisher DOI: 10.1074/jbc.M701607200
PMID: 17686782
Abstract: Sphingoid long-chain base 1-phosphates act as bioactive lipid molecules in eukaryotic cells. In budding yeast, long-chain base 1-phosphates are synthesized mainly by the long-chain base kinase Lcb4. We recently reported that, soon after yeast cells enter into the stationary phase, Lcb4 is rapidly degraded by being delivered to the vacuole in a palmitoylation- and phosphorylation-dependent manner. In this study, we investigated the complete trafficking pathway of Lcb4, from its synthesis to its degradation. After membrane anchoring by palmitoylation at the Golgi apparatus, Lcb4 is delivered to the plasma membrane (PM) through the late Sec pathway and then to the endoplasmic reticulum (ER). The yeast ER consists of a cortical network juxtaposed to the PM (cortical ER) with tubular connections to the nuclear envelope (nuclear ER). Remarkably, the localization of Lcb4 is restricted to the cortical ER. As the cells reach the stationary phase, G1 cell cycle arrest initiates Lcb4 degradation and its delivery to the vacuole via the Golgi apparatus. The protein transport pathway from the PM to the ER found in this study has not been previously reported. We speculate that this novel pathway is mediated by the PM-ER contact.
Rights: Copyright © 2007 by the American Society for Biochemistry and Molecular Biology
Type: article (author version)
URI: http://hdl.handle.net/2115/30180
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: 木原 章雄

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