11 research outputs found

    Kinase Screening in <i>Pichia pastoris</i> Identified Promising Targets Involved in Cell Growth and <i>Alcohol Oxidase 1</i> Promoter (P<i><sub>AOX1</sub></i>) Regulation

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    <div><p>As one of the most commonly used eukaryotic recombinant protein expression systems, <i>P</i>. <i>pastoris</i> relies heavily on the <i>AOX1</i> promoter (P<sub><i>AOX1</i></sub>), which is strongly induced by methanol but strictly repressed by glycerol and glucose. However, the complicated signaling pathways involved in P<sub><i>AOX1</i></sub> regulation when supplemented with different carbon sources are poorly understood. Here we constructed a kinase deletion library in <i>P</i>. <i>pastoris</i> and identified 27 mutants which showed peculiar phenotypes in cell growth or P<sub><i>AOX1</i></sub> regulation. We analyzed both annotations and possible functions of these 27 targets, and then focused on the MAP kinase Hog1. In order to locate its potential downstream components, we performed the phosphoproteome analysis on glycerol cultured WT and Δ<i>hog1</i> strains and identified 157 differentially phosphorylated proteins. Our results identified important kinases involved in <i>P</i>. <i>pastoris</i> cell growth and P<sub><i>AOX1</i></sub> regulation, which could serve as valuable targets for further mechanistic studies.</p></div

    A venn diagram showing the number of phosphoproteins identified in H-G, W-G and W-M.

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    <p>Blue shaded area marks the number of phosphoproteins specifically identified in one strain. Pink shaded area makes shared phosphoproteins in two strains, while green area labels the common phosphoproteins identified in all three strains. H-G: glycerol cultured Δ<i>hog1</i> strain; W-G: glycerol cultured WT strain; W-M: methanol cultured WT strain.</p
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