0000000000768299

AUTHOR

Malika Jaquenoud

showing 2 related works from this author

TORC1 coordinates the conversion of Sic1 from a target to an inhibitor of cyclin-CDK-Cks1

2017

Eukaryotic cell cycle progression through G(1)-S is driven by hormonal and growth-related signals that are transmitted by the target of rapamycin complex 1 (TORC1) pathway. In yeast, inactivation of TORC1 restricts G(1)-S transition due to the rapid clearance of G(1) cyclins (Cln) and the stabilization of the B-type cyclin (Clb) cyclin-dependent kinase (CDK) inhibitor Sic1. The latter mechanism remains mysterious but requires the phosphorylation of Sic1-Thr(173) by Mpk1 and inactivation of the Sic1-pThr(173)-targeting phosphatase (PP2A(Cdc55)) through greatwall kinase-activated endosulfines. Here we show that the Sic1-pThr(173) residue serves as a specific docking site for the CDK phospho-a…

BioquímicaBiologiaCDK inhibitor (CDKI)Rim15Sic1cyclin-dependent protein kinase (CDK)G1 cell cycle arrestgreatwall kinase pathwayG(1) cell cycle arrestCks1Articletarget of rapamycin complex 1 (TORC1)Cell Discovery
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TORC1 controls G1–S cell cycle transition in yeast via Mpk1 and the greatwall kinase pathway

2015

The target of rapamycin complex 1 (TORC1) pathway couples nutrient, energy and hormonal signals with eukaryotic cell growth and division. In yeast, TORC1 coordinates growth with G1–S cell cycle progression, also coined as START, by favouring the expression of G1 cyclins that activate cyclin-dependent protein kinases (CDKs) and by destabilizing the CDK inhibitor Sic1. Following TORC1 downregulation by rapamycin treatment or nutrient limitation, clearance of G1 cyclins and C-terminal phosphorylation of Sic1 by unknown protein kinases are both required for Sic1 to escape ubiquitin-dependent proteolysis prompted by its flagging via the SCFCdc4 (Skp1/Cul1/F-box protein) ubiquitin ligase complex.…

BioquímicaBiologiaSaccharomyces cerevisiae ProteinsImmunoblottingGeneral Physics and AstronomyCell Cycle ProteinsSaccharomyces cerevisiaeMechanistic Target of Rapamycin Complex 1ArticleGeneral Biochemistry Genetics and Molecular Biology03 medical and health sciences0302 clinical medicineCyclin-dependent kinaseCyclinsImmunoprecipitationProtein Phosphatase 2Cell division control protein 4PhosphorylationProtein kinase ACyclin-Dependent Kinase Inhibitor Proteins030304 developmental biology0303 health sciencesMultidisciplinarybiologyTOR Serine-Threonine KinasesUbiquitin-Protein Ligase ComplexesGeneral ChemistryBlotting NorthernFlow CytometryG1 Phase Cell Cycle CheckpointsSic1Cyclin-Dependent KinasesCell biologyBiochemistryMultiprotein Complexes030220 oncology & carcinogenesisUbiquitin ligase complexbiology.proteinIntercellular Signaling Peptides and ProteinsPhosphorylationTOR Serine-Threonine KinasesMitogen-Activated Protein KinasesPeptidesProtein KinasesCyclin-dependent kinase inhibitor proteinNature Communications
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