Role of Atg8 in the regulation of vacuolar membrane invagination

Abstract Cellular heat stress can cause damage, and significant changes, to a variety of cellular structures. When exposed to chronically high temperatures, yeast cells invaginate vacuolar membranes. In this study, we found that the expression of Atg8, an essential autophagy factor, is induced after...

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Autores principales:	Ayane Ishii, Kazuo Kurokawa, Miyuu Hotta, Suzuka Yoshizaki, Maki Kurita, Aya Koyama, Akihiko Nakano, Yoko Kimura
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2019
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/9d944fba72ac46dca50a5d00acbe478d
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spelling	oai:doaj.org-article:9d944fba72ac46dca50a5d00acbe478d2021-12-02T15:09:24ZRole of Atg8 in the regulation of vacuolar membrane invagination10.1038/s41598-019-51254-12045-2322https://doaj.org/article/9d944fba72ac46dca50a5d00acbe478d2019-10-01T00:00:00Zhttps://doi.org/10.1038/s41598-019-51254-1https://doaj.org/toc/2045-2322Abstract Cellular heat stress can cause damage, and significant changes, to a variety of cellular structures. When exposed to chronically high temperatures, yeast cells invaginate vacuolar membranes. In this study, we found that the expression of Atg8, an essential autophagy factor, is induced after chronic heat stress. In addition, without Atg8, vacuolar invaginations are induced conspicuously, beginning earlier and invaginating vacuoles more frequently after heat stress. Our results indicate that Atg8’s invagination-suppressing functions do not require Atg8 lipidation, in contrast with autophagy, which requires Atg8 lipidation. Genetic analyses of vps24 and vps23 further suggest that full ESCRT machinery is necessary to form vacuolar invaginations irrespective of Atg8. In contrast, through a combined mutation with the vacuole BAR domain protein Ivy1, vacuoles show constitutively enhanced invaginated structures. Finally, we found that the atg8Δivy1Δ mutant is sensitive against agents targeting functions of the vacuole and/or plasma membrane (cell wall). Collectively, our findings revealed that Atg8 maintains vacuolar membrane homeostasis in an autophagy-independent function by coordinating with other cellular factors.Ayane IshiiKazuo KurokawaMiyuu HottaSuzuka YoshizakiMaki KuritaAya KoyamaAkihiko NakanoYoko KimuraNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 9, Iss 1, Pp 1-11 (2019)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Ayane Ishii Kazuo Kurokawa Miyuu Hotta Suzuka Yoshizaki Maki Kurita Aya Koyama Akihiko Nakano Yoko Kimura Role of Atg8 in the regulation of vacuolar membrane invagination
description	Abstract Cellular heat stress can cause damage, and significant changes, to a variety of cellular structures. When exposed to chronically high temperatures, yeast cells invaginate vacuolar membranes. In this study, we found that the expression of Atg8, an essential autophagy factor, is induced after chronic heat stress. In addition, without Atg8, vacuolar invaginations are induced conspicuously, beginning earlier and invaginating vacuoles more frequently after heat stress. Our results indicate that Atg8’s invagination-suppressing functions do not require Atg8 lipidation, in contrast with autophagy, which requires Atg8 lipidation. Genetic analyses of vps24 and vps23 further suggest that full ESCRT machinery is necessary to form vacuolar invaginations irrespective of Atg8. In contrast, through a combined mutation with the vacuole BAR domain protein Ivy1, vacuoles show constitutively enhanced invaginated structures. Finally, we found that the atg8Δivy1Δ mutant is sensitive against agents targeting functions of the vacuole and/or plasma membrane (cell wall). Collectively, our findings revealed that Atg8 maintains vacuolar membrane homeostasis in an autophagy-independent function by coordinating with other cellular factors.
format	article
author	Ayane Ishii Kazuo Kurokawa Miyuu Hotta Suzuka Yoshizaki Maki Kurita Aya Koyama Akihiko Nakano Yoko Kimura
author_facet	Ayane Ishii Kazuo Kurokawa Miyuu Hotta Suzuka Yoshizaki Maki Kurita Aya Koyama Akihiko Nakano Yoko Kimura
author_sort	Ayane Ishii
title	Role of Atg8 in the regulation of vacuolar membrane invagination
title_short	Role of Atg8 in the regulation of vacuolar membrane invagination
title_full	Role of Atg8 in the regulation of vacuolar membrane invagination
title_fullStr	Role of Atg8 in the regulation of vacuolar membrane invagination
title_full_unstemmed	Role of Atg8 in the regulation of vacuolar membrane invagination
title_sort	role of atg8 in the regulation of vacuolar membrane invagination
publisher	Nature Portfolio
publishDate	2019
url	https://doaj.org/article/9d944fba72ac46dca50a5d00acbe478d
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Role of Atg8 in the regulation of vacuolar membrane invagination

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