Differential Requirement for the Cell Wall Integrity Sensor Wsc1p in Diploids Versus Haploids.
Publication Date
2021-12-08Journal Title
J Fungi (Basel)
ISSN
2309-608X
Publisher
MDPI AG
Volume
7
Issue
12
Language
en
Type
Article
This Version
VoR
Metadata
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Hall, A. E., Lisci, M., & Rose, M. D. (2021). Differential Requirement for the Cell Wall Integrity Sensor Wsc1p in Diploids Versus Haploids.. J Fungi (Basel), 7 (12) https://doi.org/10.3390/jof7121049
Abstract
The primary role of the Cell Wall Integrity Pathway (CWI) in Saccharomyces cerevisiae is monitoring the state of the cell wall in response to general life cycle stresses (growth and mating) and imposed stresses (temperature changes and chemicals). Of the five mechanosensor proteins monitoring cell wall stress, Wsc1p and Mid2p are the most important. We find that WSC1 has a stringent requirement in zygotes and diploids, unlike haploids, and differing from MID2's role in shmoos. Diploids lacking WSC1 die frequently, independent of mating type. Death is due to loss of cell wall and plasma membrane integrity, which is suppressed by osmotic support. Overexpression of several CWI pathway components suppress wsc1∆ zygotic death, including WSC2, WSC3, and BEM2, as well as the Rho-GAPS, BEM3 and RGD2. Microscopic observations and suppression by BEM2 and BEM3 suggest that wsc1∆ zygotes die during bud emergence. Downstream in the CWI pathway, overexpression of a hyperactive protein kinase C (Pkc1p-R398P) causes growth arrest, and blocks the pheromone response. With moderate levels of Pkc1p-R398P, cells form zygotes and the wsc1∆ defect is suppressed. This work highlights functional differences in the requirement for Wsc1p in diploids Versus haploids and between Mid2p and Wsc1p during mating.
Keywords
cell wall integrity, conjugation, ploidy, yeast, lysis, protein kinase C
Sponsorship
National Institute of Health (R01GM037739)
National Institutes of Health (R35GM126998, GM007388)
Identifiers
External DOI: https://doi.org/10.3390/jof7121049
This record's URL: https://www.repository.cam.ac.uk/handle/1810/331874
Rights
Licence:
https://creativecommons.org/licenses/by/4.0/
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