Evidence for Antagonistic Regulation of Cell Growth by the Calcineurin and High Osmolarity Glycerol Pathways in Saccharomyces cerevisiae

Because Ca 2+ signaling of budding yeast, through the activation of calcineurin and the Mpk1/Slt2 mitogen-activated protein kinase cascade, performs redundant function(s) in the events essential for growth, the simultaneous deletion of both these pathways (Δ cnb1 Δ mpk1 ) leads to lethality. A PTC...

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Veröffentlicht in:The Journal of biological chemistry 2004-01, Vol.279 (5), p.3651-3661
Hauptverfasser: Shitamukai, Atsunori, Hirata, Dai, Sonobe, Shinya, Miyakawa, Tokichi
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container_issue 5
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container_title The Journal of biological chemistry
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creator Shitamukai, Atsunori
Hirata, Dai
Sonobe, Shinya
Miyakawa, Tokichi
description Because Ca 2+ signaling of budding yeast, through the activation of calcineurin and the Mpk1/Slt2 mitogen-activated protein kinase cascade, performs redundant function(s) in the events essential for growth, the simultaneous deletion of both these pathways (Δ cnb1 Δ mpk1 ) leads to lethality. A PTC4 cDNA that encodes a protein phosphatase belonging to the PP2C family was obtained as a high dosage suppressor of the lethality of Δ cnb1 Δ mpk1 strain. Overexpression of PTC4 led to a decrease in the high osmolarity-induced Hog1 phosphorylation, and HOG1 deletion remarkably suppressed the synthetic lethality, indicating an antagonistic role of the high osmolarity glycerol (HOG) pathway and the Ca 2+ signaling pathway in growth regulation. The calcineurin-Crz1 pathway was required for the down-regulation of the HOG pathway. Analysis of the time course of actin polarization, bud formation, and the onset of mitosis in synchronous cell cultures demonstrated that calcineurin negatively regulates actin polarization at the bud site, whereas the HOG pathway positively regulates bud formation at a later step after actin has polarized.
doi_str_mv 10.1074/jbc.M306098200
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source MEDLINE; Elektronische Zeitschriftenbibliothek - Frei zugängliche E-Journals; Alma/SFX Local Collection
subjects Actins - metabolism
Calcineurin - metabolism
Calcium - metabolism
Cell Cycle
Cell Division
Cell Separation
DNA, Complementary - metabolism
DNA-Binding Proteins
Flow Cytometry
G2 Phase
Gene Deletion
Genotype
Glycerol - metabolism
Hog1 protein
Microscopy, Fluorescence
Mitogen-Activated Protein Kinases - metabolism
Mitosis
Models, Biological
Mutation
Phenotype
Phosphoprotein Phosphatases - metabolism
Phosphorylation
Plasmids - metabolism
Protein Phosphatase 2C
Saccharomyces cerevisiae
Saccharomyces cerevisiae - metabolism
Saccharomyces cerevisiae Proteins - metabolism
Signal Transduction
Time Factors
Trans-Activators - metabolism
Transcription Factors
title Evidence for Antagonistic Regulation of Cell Growth by the Calcineurin and High Osmolarity Glycerol Pathways in Saccharomyces cerevisiae
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