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J Cell Sci. 2018 Jul 10. pii: jcs.217091. doi: 10.1242/jcs.217091. [Epub ahead of print]

Persistent actin depolarization caused by ethanol induces the formation of multiple small cortical septin rings in yeast.

Author information

1
Laboratory of Microbial Technology, Graduate School of Science and Technology, Kyoto Institute of Technology, Kyoto, Japan.
2
Laboratory of Microbial Technology, Graduate School of Science and Technology, Kyoto Institute of Technology, Kyoto, Japan thioredoxin@kit.ac.jp.

Abstract

Short-term exposure to severe ethanol stress has adverse effects on yeast cells. However, limited information is available on the effects of long-term exposure to severe ethanol stress. In this study, we examined the effects of a long-term treatment with a high ethanol concentration (10% v/v) on yeast morphology. We found that long-term severe ethanol stress induced the continuous depolarization of the actin cytoskeleton and hypertrophy in yeast cells, accompanied by the aberrant localization of septins, which formed multiple small cortical rings (MSCRs). The formation of MSCRs was also induced by the continuous depolarization of the actin cytoskeleton caused by a treatment with latrunculin-A, an effective inhibitor of actin polymerization. Unlike the formation of conventional septin rings, the formation of MSCRs did not require Cdc42 and its effectors, Gic1/Gic2 and Cla4. These results provide novel insights into the effects of persistent actin depolarization caused by long-term exposure to severe ethanol stress on yeast cytomorphology.

KEYWORDS:

Actin; Cdc42; Ethanol stress; Multiple small cortical rings of septin; Septin; Yeast

PMID:
29991513
DOI:
10.1242/jcs.217091

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