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Yapsins Are a Family of Aspartyl Proteases Required for Cell Wall Integrity in Saccharomyces cerevisiae
Journal article   Open access   Peer reviewed

Yapsins Are a Family of Aspartyl Proteases Required for Cell Wall Integrity in Saccharomyces cerevisiae

Damian J Krysan, Elizabeth L Ting, Claudia Abeijon, Lee Kroos and Robert S Fuller
Eukaryotic cell, Vol.4(8), pp.1364-1374
08/2005
DOI: 10.1128/EC.4.8.1364-1374.2005
PMCID: PMC1214537
PMID: 16087741
url
https://doi.org/10.1128/EC.4.8.1364-1374.2005View
Published (Version of record) Open Access

Abstract

ABSTRACT The yeast cell wall is a crucial extracellular organelle that protects the cell from lysis during environmental stress and morphogenesis. Here, we demonstrate that the yapsin family of five glycosylphosphatidylinositol-linked aspartyl proteases is required for cell wall integrity in Saccharomyces cerevisiae . Yapsin null mutants show hypersensitivity to cell wall perturbation, and both the yps1 Δ 2 Δ mutant and the quintuple yapsin mutant (5 yps Δ) undergo osmoremedial cell lysis at 37°C. The cell walls of both 5 yps Δ and yps1 Δ 2 Δ mutants have decreased amounts of 1,3- and 1,6-β-glucan. Although there is decreased incorporation of both 1,3- and 1,6-β-glucan in the 5 yps Δ mutant in vivo, in vitro specific activity of both 1,3- and 1,6-β-glucan synthesis is similar to wild type, indicating that the yapsins affect processes downstream of glucan synthesis and that the yapsins may be involved in the incorporation or retention of cell wall glucan. Presumably as a response to the significant alterations in cell wall composition, the cell wall integrity mitogen-activated kinase signaling cascade ( PKC1-MPK pathway) is basally active in 5 yps Δ. YPS1 expression is induced during cell wall stress and remodeling in a PKC1-MPK1 -dependent manner, indicating that Yps1p is a direct, and important, output of the cell wall integrity response. The Candida albicans ( SAP9 ) and Candida glabrata ( CgYPS1 ) homologues of YPS1 complement the phenotypes of the yps1 Δ mutant. Taken together, these data indicate that the yapsins play an important role in glucan homeostasis in S. cerevisiae and that yapsin homologues may play a similar role in the pathogenic yeasts C. albicans and C. glabrata .

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