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Reference: Rodicio R, et al. (2008) Dissecting sensor functions in cell wall integrity signaling in Kluyveromyces lactis. Fungal Genet Biol 45(4):422-35

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Abstract

KlWSC1, KlWSC2/3 and KlMID2, which encode putative plasma membrane sensors for cell wall integrity signaling in Kluyveromyces lactis, were cloned and characterized. Double and triple deletion mutants show severe cell integrity defects, indicating overlapping functions. The Klwsc1 Klmid2 double deletion phenotype can be suppressed by overexpression of the downstream components KlROM2, KlPKC1 and KlBCK1. KlWsc1 sensor domain analyses showed that an amino-terminal elongation as well as an extension within the cytoplasmic domain are dispensable for function. Heterologous complementation by KlMID2 and KlWSC1 in Saccharomyces cerevisiae is only achieved upon overexpression. In contrast to ScMID2, ScWSC1 complements in K. lactis. Functional studies with chimeric Mid2 constructs indicate that species specificity is mainly conferred by the extracellular domain. Sensor-GFP fusions localize to the plasma membrane, with a cell cycle dependent distribution of KlWsc1-GFP. Both Wsc-type sensors concentrate in discrete spots within the plasma membrane.

Reference Type
Journal Article
Authors
Rodicio R, Buchwald U, Schmitz HP, Heinisch JJ
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