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The Rim101 pathway contributes to ER stress adaptation through sensing the state of plasma membrane

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Title: The Rim101 pathway contributes to ER stress adaptation through sensing the state of plasma membrane
Authors: Obara, Keisuke Browse this author →KAKEN DB
Kihara, Akio Browse this author →KAKEN DB
Keywords: ER stress
plasma membrane
contact site
lipid asymmetry
Rim101 pathway
Saccharomyces cerevisiae
Issue Date: 1-Jan-2017
Publisher: Portland Press Ltd
Journal Title: Biochemical journal
Volume: 474
Start Page: 51
End Page: 63
Publisher DOI: 10.1042/BCJ20160580
PMID: 27803246
Abstract: Yeast cells sense alterations in the plasma membrane (PM) lipid asymmetry and external alkalization by the sensor protein Rim21, which functions in the Rim101 pathway. Rim101 signaling is initiated at the PM by the recruitment of the Rim101 signaling complex. The PM physically associates with the cortical endoplasmic reticulum (ER) to form ER-PM contact sites, where several signaling events, lipid exchange, and ion transport take place. In the present study, we investigated the spatial relationship between ER-PM contact sites and the sites of Rim101 signaling. Rim101 signaling mostly proceeds outside ER-PM contact sites in the PM and did not require intact ER-PM contact for its activation. Rather, the Rim101 pathway was constitutively activated by ER-PM contact site disruption, which is known to cause ER stress. ER stress induced by tunicamycin treatment activated the Rim101 pathway. Furthermore, the sensitivity of cells to tunicamycin without ER-PM contact was considerably elevated by the deletion of RIM21. These results suggest that the Rim101 pathway is important for the adaptation to ER stress by compensating for alterations in PM lipid asymmetry induced by ER stress.
Type: article (author version)
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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