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• W2023192033 endingPage "42016" @default.
• W2023192033 startingPage "42002" @default.
• W2023192033 abstract "The Hog1 stress-activated protein kinase regulates both stress responses and morphogenesis in Candida albicans and is essential for the virulence of this major human pathogen. Stress-induced Hog1 phosphorylation is regulated by the upstream MAPKK, Pbs2, which in turn is regulated by the MAPKKK, Ssk2. Here, we have investigated the role of phosphorylation of Hog1 and Pbs2 in Hog1-mediated processes in C. albicans. Mutation of the consensus regulatory phosphorylation sites of Hog1 (Thr-174/Tyr-176) and Pbs2 (Ser-355/Thr-359), to nonphosphorylatable residues, resulted in strains that phenocopied hog1Δ and pbs2Δ cells. Consistent with this, stress-induced phosphorylation of Hog1 was abolished in cells expressing nonphosphorylatable Pbs2 (Pbs2(AA)). However, mutation of the consensus sites of Pbs2 to phosphomimetic residues (Pbs2(DD)) failed to constitutively activate Hog1. Furthermore, Ssk2-independent stress-induced Hog1 activation was observed in Pbs2(DD) cells. Collectively, these data reveal a previously uncharacterized MAPKKK-independent mechanism of Hog1 activation in response to stress. Although Pbs2(DD) cells did not exhibit high basal levels of Hog1 phosphorylation, overexpression of an N-terminal truncated form of Ssk2 did result in constitutive Hog1 activation, which was further increased upon stress. Significantly, both Pbs2(AA) and Pbs2(DD) cells displayed impaired stress resistance and attenuated virulence in a mouse model of disease, whereas only Pbs2(AA) cells exhibited the morphological defects associated with loss of Hog1 function. This indicates that Hog1 mediates C. albicans virulence by conferring stress resistance rather than regulating morphogenesis." @default.
• W2023192033 created "2016-06-24" @default.
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• W2023192033 date "2011-12-01" @default.
• W2023192033 modified "2023-09-27" @default.
• W2023192033 title "MAPKKK-independent Regulation of the Hog1 Stress-activated Protein Kinase in Candida albicans" @default.
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• W2023192033 doi "https://doi.org/10.1074/jbc.m111.265231" @default.
• W2023192033 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/3234903" @default.
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