RRC ID 76731
Author Ishii A, Kurokawa K, Hotta M, Yoshizaki S, Kurita M, Koyama A, Nakano A, Kimura Y.
Title Role of Atg8 in the regulation of vacuolar membrane invagination.
Journal Sci Rep
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.
Volume 9(1)
Pages 14828
Published 2019-10-15
DOI 10.1038/s41598-019-51254-1
PII 10.1038/s41598-019-51254-1
PMID 31616012
PMC PMC6794316
MeSH Autophagy Autophagy-Related Protein 8 Family / metabolism* Carrier Proteins / genetics Carrier Proteins / metabolism Endosomal Sorting Complexes Required for Transport / genetics Endosomal Sorting Complexes Required for Transport / metabolism* Heat-Shock Response Intracellular Membranes / metabolism* Mutation Saccharomyces cerevisiae Proteins / genetics Saccharomyces cerevisiae Proteins / metabolism* Vacuoles / metabolism*
IF 3.998
Yeast BY20695