Two protein tyrosine phosphatases, Ptp2 and Ptp3, modulate the subcellular localization of the Hog1 MAP kinase in yeast.
The MAP kinase Hog1 transiently accumulates in the nucleus upon activation. Although Hog1 nuclear export correlates with its dephosphorylation, we find that dephosphorylation is not necessary for export. Unexpectedly, a strain lacking the nuclear protein tyrosine phosphatase, Ptp2, showed decreased Hog1 nuclear retention, while a strain lacking the cytoplasmic Ptp3 showed prolonged Hog1 nuclear accumulation, consistent with Ptp2 being a nuclear tether for Hog1 and Ptp3 being a cytoplasmic anchor. In support of this result PTP2 overexpression sequestered Hog1 in the nucleus while PTP3 overexpression restricted Hog1 to the cytoplasm. Thus, Ptp2 and Ptp3 regulate Hog1 localization by binding Hog1.
Mattison
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Department of Chemistry and Biochemistry, University of Colorado, Boulder, Colorado 80309-0215, USA.
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D000222:Adaptation, Physiological; D001692:Biological Transport / Q000187:drug effects; D002467:Cell Nucleus / Q000187:drug effects / Q000201:enzymology / Q000378:metabolism; D003593:Cytoplasm / Q000187:drug effects / Q000201:enzymology / Q000378:metabolism; D004789:Enzyme Activation; D005656:Fungal Proteins / Q000235:genetics / Q000378:metabolism; D047908:Intracellular Signaling Peptides and Proteins; D008856:Microscopy, Fluorescence; D020928:Mitogen-Activated Protein Kinases / Q000235:genetics / Q000378:metabolism*; D009154:Mutation / Q000235:genetics; D009994:Osmolar Concentration; D010766:Phosphorylation; D010769:Phosphothreonine / Q000378:metabolism; D019000:Phosphotyrosine / Q000378:metabolism; D011233:Precipitin Tests; D011485:Protein Binding; D054592:Protein Tyrosine Phosphatase, Non-Receptor Type 11; D053824:Protein Tyrosine Phosphatase, Non-Receptor Type 6; D017027:Protein Tyrosine Phosphatases / Q000235:genetics / Q000378:metabolism*; D011993:Recombinant Fusion Proteins / Q000235:genetics / Q000378:metabolism; D012441:Saccharomyces cerevisiae / Q000166:cytology / Q000201:enzymology* / Q000235:genetics / Q000378:metabolism; D029701:Saccharomyces cerevisiae Proteins; D012965:Sodium Chloride / Q000494:pharmacology
D005656:Fungal Proteins; D047908:Intracellular Signaling Peptides and Proteins; D011993:Recombinant Fusion Proteins; D029701:Saccharomyces cerevisiae Proteins; D010769:Phosphothreonine; D019000:Phosphotyrosine; D012965:Sodium Chloride; C088589:HOG1 protein, S cerevisiae; D020928:Mitogen-Activated Protein Kinases; D054592:Protein Tyrosine Phosphatase, Non-Receptor Type 11; D053824:Protein Tyrosine Phosphatase, Non-Receptor Type 6; D017027:Protein Tyrosine Phosphatases