دورية أكاديمية
أعرض في EDS

Cdc42-Specific GTPase-Activating Protein Rga1 Squelches Crosstalk between the High-Osmolarity Glycerol (HOG) and Mating Pheromone Response MAPK Pathways.

التفاصيل البيبلوغرافية
العنوان: Cdc42-Specific GTPase-Activating Protein Rga1 Squelches Crosstalk between the High-Osmolarity Glycerol (HOG) and Mating Pheromone Response MAPK Pathways.
المؤلفون: Patterson JC; Department of Molecular and Cell Biology, Division of Biochemistry, Biophysics and Structural Biology, University of California, Berkeley, CA 94720, USA.; Yaffe Laboratory, David H. Koch Institute for Integrative Cancer Research, Massachusetts Institute of Technology, Cambridge, MA 02139, USA., Goupil LS; Department of Molecular and Cell Biology, Division of Biochemistry, Biophysics and Structural Biology, University of California, Berkeley, CA 94720, USA.; Harney Science Center, Department of Biology, University of San Francisco, Rm. 258, San Francisco, CA 94117, USA., Thorner J; Department of Molecular and Cell Biology, Division of Biochemistry, Biophysics and Structural Biology, University of California, Berkeley, CA 94720, USA.
المصدر: Biomolecules [Biomolecules] 2021 Oct 17; Vol. 11 (10). Date of Electronic Publication: 2021 Oct 17.
نوع المنشور: Journal Article; Research Support, N.I.H., Extramural; Research Support, Non-U.S. Gov't
اللغة: English
بيانات الدورية: Publisher: MDPI Country of Publication: Switzerland NLM ID: 101596414 Publication Model: Electronic Cited Medium: Internet ISSN: 2218-273X (Electronic) Linking ISSN: 2218273X NLM ISO Abbreviation: Biomolecules Subsets: MEDLINE
أسماء مطبوعة: Original Publication: Basel, Switzerland : MDPI, 2011-
مواضيع طبية MeSH: CDC28 Protein Kinase, S cerevisiae/*genetics , GTPase-Activating Proteins/*genetics , Mitogen-Activated Protein Kinases/*genetics , Pheromones/*genetics , Saccharomyces cerevisiae Proteins/*genetics , cdc42 GTP-Binding Protein/*genetics, Catalytic Domain/genetics ; Gene Expression Regulation, Fungal/genetics ; Genes, Mating Type, Fungal/genetics ; Phosphoprotein Phosphatases/genetics ; Phosphorylation/genetics ; Saccharomyces cerevisiae/genetics ; Signal Transduction/genetics
مستخلص: Eukaryotes utilize distinct mitogen/messenger-activated protein kinase (MAPK) pathways to evoke appropriate responses when confronted with different stimuli. In yeast, hyperosmotic stress activates MAPK Hog1, whereas mating pheromones activate MAPK Fus3 (and MAPK Kss1). Because these pathways share several upstream components, including the small guanosine-5'-triphosphate phosphohydrolase (GTPase) cell-division-cycle-42 (Cdc42), mechanisms must exist to prevent inadvertent cross-pathway activation. Hog1 activity is required to prevent crosstalk to Fus3 and Kss1. To identify other factors required to maintain signaling fidelity during hypertonic stress, we devised an unbiased genetic selection for mutants unable to prevent such crosstalk even when active Hog1 is present. We repeatedly isolated truncated alleles of RGA1 , a Cdc42-specific GTPase-activating protein (GAP), each lacking its C-terminal catalytic domain, that permit activation of the mating MAPKs under hyperosmotic conditions despite Hog1 being present. We show that Rga1 down-regulates Cdc42 within the high-osmolarity glycerol (HOG) pathway, but not the mating pathway. Because induction of mating pathway output via crosstalk from the HOG pathway takes significantly longer than induction of HOG pathway output, our findings suggest that, under normal conditions, Rga1 contributes to signal insulation by limiting availability of the GTP-bound Cdc42 pool generated by hypertonic stress. Thus, Rga1 action contributes to squelching crosstalk by imposing a type of "kinetic proofreading". Although Rga1 is a Hog1 substrate in vitro, we eliminated the possibility that its direct Hog1-mediated phosphorylation is necessary for its function in vivo. Instead, we found first that, like its paralog Rga2, Rga1 is subject to inhibitory phosphorylation by the S. cerevisiae cyclin-dependent protein kinase 1 (Cdk1) ortholog Cdc28 and that hyperosmotic shock stimulates its dephosphorylation and thus Rga1 activation. Second, we found that Hog1 promotes Rga1 activation by blocking its Cdk1-mediated phosphorylation, thereby allowing its phosphoprotein phosphatase 2A (PP2A)-mediated dephosphorylation. These findings shed light on why Hog1 activity is required to prevent crosstalk from the HOG pathway to the mating pheromone response pathway.
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معلومات مُعتمدة: GM07232 United States GM NIGMS NIH HHS; R01 GM101314 United States GM NIGMS NIH HHS; R01 GM021841 United States GM NIGMS NIH HHS; GM21841 United States GM NIGMS NIH HHS
فهرسة مساهمة: Keywords: cell regulation; protein phosphorylation; reporters; signal insulation; single-cell analysis; transcriptional
المشرفين على المادة: 0 (GTPase-Activating Proteins)
0 (Pheromones)
0 (Rga1 protein, S cerevisiae)
0 (Saccharomyces cerevisiae Proteins)
EC 2.7.11.22 (CDC28 Protein Kinase, S cerevisiae)
EC 2.7.11.24 (FUS3 protein, S cerevisiae)
EC 2.7.11.24 (HOG1 protein, S cerevisiae)
EC 2.7.11.24 (KSS1 protein, S cerevisiae)
EC 2.7.11.24 (Mitogen-Activated Protein Kinases)
EC 3.1.3.16 (Phosphoprotein Phosphatases)
EC 3.6.5.2 (cdc42 GTP-Binding Protein)
تواريخ الأحداث: Date Created: 20211023 Date Completed: 20220119 Latest Revision: 20220119
رمز التحديث: 20221213
مُعرف محوري في PubMed: PMC8533825
DOI: 10.3390/biom11101530
PMID: 34680163
قاعدة البيانات: MEDLINE
الوصف
تدمد:2218-273X
DOI:10.3390/biom11101530