2023
Phosphatases maintain low catalytic activity of SGK1: DNA damage resets the balance in favor of phosphorylation
Gu W, Zheng H, Canessa C. Phosphatases maintain low catalytic activity of SGK1: DNA damage resets the balance in favor of phosphorylation. Journal Of Biological Chemistry 2023, 299: 104941. PMID: 37343701, PMCID: PMC10372406, DOI: 10.1016/j.jbc.2023.104941.Peer-Reviewed Original ResearchConceptsDNA-dependent protein kinaseCell survivalHsp90 chaperone complexDNA damage responseGlucocorticoid-induced kinase 1Inhibitor of phosphatasesChaperone complexGenotoxic stressDamage responseCatalytic subunitProtein kinaseNovel cancer therapiesKinase 1Stress conditionsDNA damageMolecular pathwaysSGK1 activityPP2ASGK1Cancer cellsDephosphorylationEndogenous inhibitorKinasePP5Phosphorylation
2021
Protein Phosphatase 2A as a Therapeutic Target in Small Cell Lung Cancer
Mirzapoiazova T, Xiao G, Mambetsariev B, Nasser MW, Miaou E, Singhal SS, Srivastava S, Mambetsariev I, Nelson MS, Nam A, Behal A, Arvanitis LD, Atri P, Muschen M, Tissot FLH, Miser J, Kovach JS, Sattler M, Batra SK, Kulkarni P, Salgia R. Protein Phosphatase 2A as a Therapeutic Target in Small Cell Lung Cancer. Molecular Cancer Therapeutics 2021, 20: 1820-1835. PMID: 34253596, PMCID: PMC8722383, DOI: 10.1158/1535-7163.mct-21-0013.Peer-Reviewed Original ResearchConceptsProtein phosphatase 2APhosphatase 2ASerine/threonine phosphataseDNA damage responseRegulation of apoptosisSmall molecule inhibitorsGlycolytic ATP productionThreonine phosphataseTwo-dimensional cultureLB100ATP productionMolecule inhibitorsPP2AThree-dimensional spheroid modelEndothelial cell monolayersGlucose uptakeCell viabilitySCLC cellsTherapeutic targetApoptosisCell monolayersMass spectrometrySpheroid modelTumor spheroidsCells
2020
STRIPAK directs PP2A activity toward MAP4K4 to promote oncogenic transformation of human cells
Kim J, Berrios C, Kim M, Schade A, Adelmant G, Yeerna H, Damato E, Iniguez A, Florens L, Washburn M, Stegmaier K, Gray N, Tamayo P, Gjoerup O, Marto J, DeCaprio J, Hahn W. STRIPAK directs PP2A activity toward MAP4K4 to promote oncogenic transformation of human cells. ELife 2020, 9: e53003. PMID: 31913126, PMCID: PMC6984821, DOI: 10.7554/elife.53003.Peer-Reviewed Original ResearchMeSH KeywordsAdaptor Proteins, Signal TransducingAnimalsCalmodulin-Binding ProteinsCell ProliferationCell Transformation, NeoplasticFemaleGene Knockdown TechniquesHEK293 CellsHeterograftsHumansIntracellular Signaling Peptides and ProteinsMicePhosphoprotein PhosphatasesProtein Serine-Threonine KinasesSignal TransductionTranscription FactorsYAP-Signaling ProteinsConceptsStriatin-interacting phosphatase and kinaseSV40 small t antigenB subunitCell transformationPP2A subunitsHippo pathway effector YAP1Regulatory B subunitPP2A B subunitsPP2A-mediated dephosphorylationSmall t antigenInduce cell transformationPP2A functionPP2A complexPP2A activityOncogenic transformationSubunit interactionsPP2AHuman cancersT antigenMAP4K4SubunitAssociated with STCell alterationsPartial lossCells
2019
Integrin α5β1 regulates PP2A complex assembly through PDE4D in atherosclerosis
Yun S, Hu R, Schwaemmle ME, Scherer AN, Zhuang Z, Koleske AJ, Pallas DC, Schwartz MA. Integrin α5β1 regulates PP2A complex assembly through PDE4D in atherosclerosis. Journal Of Clinical Investigation 2019, 129: 4863-4874. PMID: 31408443, PMCID: PMC6819111, DOI: 10.1172/jci127692.Peer-Reviewed Original ResearchConceptsPP2A regulatory subunit B55αTranscription factor YAPActive PDEComplex assemblyAdapter rolePDE4D5B55αIntegrin α5EC phenotypeCell functionInflammatory signalingAthero-prone regionsActivationComplexesPP2AInflammatory activationWidespread consequencesDephosphorylationProteomicsVascular remodelingPlaque sizeAtherosclerotic plaque sizeSignalingYAPRegulatesA novel anti-melanoma SRC-family kinase inhibitor
Halaban R, Bacchiocchi A, Straub R, Cao J, Sznol M, Narayan D, Allam A, Krauthammer M, Mansour TS. A novel anti-melanoma SRC-family kinase inhibitor. Oncotarget 2019, 10: 2237-2251. PMID: 31040916, PMCID: PMC6481345, DOI: 10.18632/oncotarget.26787.Peer-Reviewed Original ResearchSrc family kinase inhibitorMAPK inhibitorTranscription factor MITFPatient-derived melanoma cellsPI3K activityKinase inhibitorsSynergistic growth inhibitionGrowth arrestMelanoma cell linesK activityProteolytic degradationCell linesERBB2 inhibitionOncogene expressionMelanoma therapyTumor growthDrug resistanceMelanoma cellsGrowth inhibitionAlternative targetsActivity leadInhibitorsPP2ASHP2Inhibition
2018
Striatin-1 is a B subunit of protein phosphatase PP2A that regulates dendritic arborization and spine development in striatal neurons
Li D, Musante V, Zhou W, Picciotto MR, Nairn AC. Striatin-1 is a B subunit of protein phosphatase PP2A that regulates dendritic arborization and spine development in striatal neurons. Journal Of Biological Chemistry 2018, 293: 11179-11194. PMID: 29802198, PMCID: PMC6052221, DOI: 10.1074/jbc.ra117.001519.Peer-Reviewed Original ResearchConceptsSerine/threonine phosphatase PP2AStriatin-interacting phosphataseRNA knockdown approachB subunitSTRIPAK complexPhosphatase PP2AProtein phosphataseMultiprotein complexesKnockdown approachStriatin familyMutant constructsStriatal neuronal culturesPP2ANeuronal developmentPrimary striatal neuronal culturesDendritic phenotypeKnockdown modelSynapse formationSubunitsSpine developmentSelective roleReduced expressionNeuron maturationNeuronal culturesStriatal neuronsB-Cell-Specific Diversion of Glucose Carbon Utilization Reveals a Unique Vulnerability in B Cell Malignancies
Xiao G, Chan LN, Klemm L, Braas D, Chen Z, Geng H, Zhang QC, Aghajanirefah A, Cosgun KN, Sadras T, Lee J, Mirzapoiazova T, Salgia R, Ernst T, Hochhaus A, Jumaa H, Jiang X, Weinstock DM, Graeber TG, Müschen M. B-Cell-Specific Diversion of Glucose Carbon Utilization Reveals a Unique Vulnerability in B Cell Malignancies. Cell 2018, 173: 470-484.e18. PMID: 29551267, PMCID: PMC6284818, DOI: 10.1016/j.cell.2018.02.048.Peer-Reviewed Original ResearchMeSH KeywordsAnimalsB-LymphocytesCarbonCell Line, TumorCell SurvivalGlucoseGlucosephosphate DehydrogenaseGlycolysisHumansIkaros Transcription FactorMiceMice, Inbred C57BLMice, Inbred NODOxidative StressPAX5 Transcription FactorPentose Phosphate PathwayPrecursor Cell Lymphoblastic Leukemia-LymphomaProtein Phosphatase 2Proto-Oncogene Proteins c-bcl-2Transcription, GeneticConceptsPentose phosphate pathwayCarbon utilizationSerine/threonine protein phosphatase 2AB-cell transcription factor PAX5Transcription factor Pax5Favor of glycolysisSmall molecule inhibitionPhosphatase 2ATranscriptional repressionRedox homeostasisOncogenic transformationTumor suppressorMolecule inhibitionPP2AGenetic studiesPhosphate pathwayB cell activationEssential roleB-cell malignanciesCell malignanciesB cellsAntioxidant protectionOxidative stressB-cell tumorsCell activation
2017
Reciprocal regulation of ARPP-16 by PKA and MAST3 kinases provides a cAMP-regulated switch in protein phosphatase 2A inhibition
Musante V, Li L, Kanyo J, Lam TT, Colangelo CM, Cheng SK, Brody AH, Greengard P, Le Novère N, Nairn AC. Reciprocal regulation of ARPP-16 by PKA and MAST3 kinases provides a cAMP-regulated switch in protein phosphatase 2A inhibition. ELife 2017, 6: e24998. PMID: 28613156, PMCID: PMC5515580, DOI: 10.7554/elife.24998.Peer-Reviewed Original ResearchConceptsARPP-16ARPP-19Protein phosphatase 2A inhibitionProtein phosphatase PP2A.Inhibition of PP2ASwitch-like responseKinase inhibitsPhosphatase PP2A.Regulatory interactionsPKA phosphorylationAntagonistic interplayReciprocal regulationBasal phosphorylationPhosphorylationMAST3PP2APKAENSAKinaseStriatal signalingPP2A.Multiple sitesInhibitionMitosisSignalingActivation of tumor suppressor protein PP2A inhibits KRAS-driven tumor growth
Sangodkar J, Perl A, Tohme R, Kiselar J, Kastrinsky D, Zaware N, Izadmehr S, Mazhar S, Wiredja D, O’Connor C, Hoon D, Dhawan N, Schlatzer D, Yao S, Leonard D, Borczuk A, Gokulrangan G, Wang L, Svenson E, Farrington C, Yuan E, Avelar R, Stachnik A, Smith B, Gidwani V, Giannini H, McQuaid D, McClinch K, Wang Z, Levine A, Sears R, Chen E, Duan Q, Datt M, Haider S, Ma’ayan A, DiFeo A, Sharma N, Galsky M, Brautigan D, Ioannou Y, Xu W, Chance M, Ohlmeyer M, Narla G. Activation of tumor suppressor protein PP2A inhibits KRAS-driven tumor growth. Journal Of Clinical Investigation 2017, 127: 2081-2090. PMID: 28504649, PMCID: PMC5451217, DOI: 10.1172/jci89548.Peer-Reviewed Original ResearchMeSH KeywordsAnimalsAntineoplastic AgentsCell Line, TumorCell SurvivalDrug Resistance, NeoplasmEnzyme ActivationEnzyme ActivatorsHumansMaleMice, Inbred BALB CMice, NudeMice, TransgenicProtein BindingProtein Phosphatase 2Proto-Oncogene Proteins p21(ras)Signal TransductionTumor BurdenXenograft Model Antitumor AssaysConceptsTumor suppressor proteinSmall molecule activatorsSuppressor proteinTumor suppressor protein phosphatase 2AMolecule activatorsProtein phosphatase 2AInactivation of kinasesOncogenic signaling proteinsPhosphatase 2AScaffold subunitSignaling proteinsEndogenous phosphatasesNegative regulatorOncogenic kinasesConformational changesCancer-associated molecular targetsKRAS-mutant lung cancerPP2AMolecular targetsProteinCancer cellsKinaseMouse xenograftsTreatment of cancerActivatorARPP-16 Is a Striatal-Enriched Inhibitor of Protein Phosphatase 2A Regulated by Microtubule-Associated Serine/Threonine Kinase 3 (Mast 3 Kinase)
Andrade EC, Musante V, Horiuchi A, Matsuzaki H, Brody AH, Wu T, Greengard P, Taylor JR, Nairn AC. ARPP-16 Is a Striatal-Enriched Inhibitor of Protein Phosphatase 2A Regulated by Microtubule-Associated Serine/Threonine Kinase 3 (Mast 3 Kinase). Journal Of Neuroscience 2017, 37: 2709-2722. PMID: 28167675, PMCID: PMC5354324, DOI: 10.1523/jneurosci.4559-15.2017.Peer-Reviewed Original ResearchConceptsSerine/threonine protein phosphataseSerine/threonine kinase 3Threonine protein phosphataseARPP-16Protein phosphataseKinase 3Protein phosphatase 2AProtein kinase A (PKA) signalingSmall acid-soluble proteinsKinase A SignalingAcid-soluble proteinsActivation of PKAPP2A substratesPhosphatase 2AARPP-16/19Heterotrimeric formMarked dephosphorylationSignal transductionSelective inhibitorPP2AA SignalingUnknown functionStriatal medium spiny neuronsMedium spiny neuronsSer46
2011
Protein Phosphatase 2A Interacts with the Na+,K+-ATPase and Modulates Its Trafficking by Inhibition of Its Association with Arrestin
Kimura T, Han W, Pagel P, Nairn AC, Caplan MJ. Protein Phosphatase 2A Interacts with the Na+,K+-ATPase and Modulates Its Trafficking by Inhibition of Its Association with Arrestin. PLOS ONE 2011, 6: e29269. PMID: 22242112, PMCID: PMC3248462, DOI: 10.1371/journal.pone.0029269.Peer-Reviewed Original ResearchMeSH KeywordsAnimalsArrestinBinding, CompetitiveChlorocebus aethiopsCOS CellsGene DeletionG-Protein-Coupled Receptor KinasesHumansImmunoprecipitationKidneyMicePhosphorylationProtein BindingProtein BiosynthesisProtein Phosphatase 2Protein Structure, SecondaryProtein SubunitsProtein TransportRatsSodium-Potassium-Exchanging ATPaseConceptsC subunitATPase traffickingCatalytic subunitP-type ATPase familyG proteinsCatalytic C subunitTwo-hybrid systemIon transport proteinsEffect of arrestinNative rat kidneyATPase interactsProtein phosphataseATPase familyReceptor kinaseHomologous sequencesTransport proteinsFunctional domainsTrafficking propertiesImportant regulatorArrestinReceptor signalingIon pumpsTraffickingDirect interactionPP2APP2A activates brassinosteroid-responsive gene expression and plant growth by dephosphorylating BZR1
Tang W, Yuan M, Wang R, Yang Y, Wang C, Oses-Prieto JA, Kim TW, Zhou HW, Deng Z, Gampala SS, Gendron JM, Jonassen EM, Lillo C, DeLong A, Burlingame AL, Sun Y, Wang ZY. PP2A activates brassinosteroid-responsive gene expression and plant growth by dephosphorylating BZR1. Nature Cell Biology 2011, 13: 124-131. PMID: 21258370, PMCID: PMC3077550, DOI: 10.1038/ncb2151.Peer-Reviewed Original ResearchMeSH KeywordsAmino Acid SequenceArabidopsisArabidopsis ProteinsDNA-Binding ProteinsGene Expression Regulation, PlantMolecular Sequence DataNuclear ProteinsPhosphorylationPlant Growth RegulatorsPlants, Genetically ModifiedProtein Phosphatase 2Sequence AlignmentSignal TransductionTriazolesTwo-Hybrid System TechniquesBeyond the Dopamine Receptor: Regulation and Roles of Serine/Threonine Protein Phosphatases
Walaas SI, Hemmings HC, Greengard P, Nairn AC. Beyond the Dopamine Receptor: Regulation and Roles of Serine/Threonine Protein Phosphatases. Frontiers In Neuroanatomy 2011, 5: 50. PMID: 21904525, PMCID: PMC3162284, DOI: 10.3389/fnana.2011.00050.Peer-Reviewed Original ResearchSerine/threonine proteinARPP-16Signaling pathwaysDARPP-32Striatal signaling pathwaysRegulator of calmodulinMultiple neurological diseasesNovel roleMolecular actionsProteinPP1Monophosphate-regulated phosphoproteinPhosphoproteinMolecular integratorPleiotropic actionsMultiple stepsMajor subclassesDopamine receptorsPathwayHuntington's diseaseRecent studiesStriatal signalingPP2ACentral nervous systemPP2B
2008
AIP1 Recruits Phosphatase PP2A to ASK1 in Tumor Necrosis Factor–Induced ASK1-JNK Activation
Min W, Lin Y, Tang S, Yu L, Zhang H, Wan T, Luhn T, Fu H, Chen H. AIP1 Recruits Phosphatase PP2A to ASK1 in Tumor Necrosis Factor–Induced ASK1-JNK Activation. Circulation Research 2008, 102: 840-848. PMID: 18292600, DOI: 10.1161/circresaha.107.168153.Peer-Reviewed Original ResearchConceptsASK1-JNK signalingASK1 dephosphorylationAssociation of PP2APP2A catalytic subunitCatalytic inactive formPP2A inhibitor okadaicASK1-JNK activationC-Jun N-terminal kinaseActivation of JNKEndothelial cellsN-terminal kinasePhosphatase PP2ACritical rolePotential phosphataseProtein phosphataseGAP domainInhibitor okadaicProtein familyCatalytic subunitC2 domainPP2AAIP1Novel memberApoptotic signalingRNA knockdown
2004
Mammalian target of rapamycin regulates IRS-1 serine 307 phosphorylation
Carlson C, White M, Rondinone C. Mammalian target of rapamycin regulates IRS-1 serine 307 phosphorylation. Biochemical And Biophysical Research Communications 2004, 316: 533-539. PMID: 15020250, DOI: 10.1016/j.bbrc.2004.02.082.Peer-Reviewed Original ResearchConceptsSerine 307 phosphorylationSerine 307Rapamycin-sensitive mannerInsulin receptor substrateRole of mTORAmino acid stimulationActivation of mTORPhosphatase PP2AKinase mTOROkadaic acidReceptor substrateInsulin signalingIRS-1MTOR activityPhosphorylationMammalian targetMTORCytosolic fractionRapamycinPP2AAcid stimulationPKBInhibitorsSignalingJNK
2003
Role of PP2A in the regulation of p38 MAPK activation in bovine aortic endothelial cells exposed to cyclic strain
Lee T, Kim SJ, Sumpio BE. Role of PP2A in the regulation of p38 MAPK activation in bovine aortic endothelial cells exposed to cyclic strain. Journal Of Cellular Physiology 2003, 194: 349-355. PMID: 12548554, DOI: 10.1002/jcp.10211.Peer-Reviewed Original ResearchConceptsP38 MAPK activationMAPK activationCatalytic subunitBovine aortic endothelial cellsPhospho-p38 MAPKOkadaic acidProtein phosphatase type 2AInhibitor of PP2AAortic endothelial cellsEndothelial cellsProtein kinaseRapid phosphorylationPP2AP38 mitogenRegulatory roleCell lysatesPhosphatase activityPP2AcMAPKPhosphorylationCyclic strainSubunitsType 2ACyclic strain resultsCells
2001
Mechanisms for Increased Levels of Phosphorylation of Elongation Factor-2 during Hibernation in Ground Squirrels †
Chen Y, Matsushita M, Nairn A, Damuni Z, Cai D, Frerichs K, Hallenbeck J. Mechanisms for Increased Levels of Phosphorylation of Elongation Factor-2 during Hibernation in Ground Squirrels †. Biochemistry 2001, 40: 11565-11570. PMID: 11560506, DOI: 10.1021/bi010649w.Peer-Reviewed Original ResearchConceptsEukaryotic elongation factor 2EEF-2 phosphorylationElongation factor 2Elongation phaseEEF-2 kinase activityProtein phosphatase 2AGround squirrelsLevel of phosphorylationFactor 2Phosphatase 2ACellular functionsCatalytic subunitUncharacterized mechanismKinase activityInhibitor 2Protein synthesisPhosphorylationPP2AHibernating animalsActive animalsHibernatorsReversible mechanismSevere reductionSquirrelsHibernation
1997
A molecular modeling analysis of the binding interactions between the okadaic acid class of natural product inhibitors and the ser-thr phosphatases, PP1 and PP2A
Gauss C, Sheppeck J, Nairn A, Chamberlin R. A molecular modeling analysis of the binding interactions between the okadaic acid class of natural product inhibitors and the ser-thr phosphatases, PP1 and PP2A. Bioorganic & Medicinal Chemistry 1997, 5: 1751-1773. PMID: 9354231, DOI: 10.1016/s0968-0896(97)00145-4.Peer-Reviewed Original ResearchConceptsSerine-threonine proteinOkadaic acid classSignal transduction pathwaysNatural product inhibitorsCatalytic subunitTransduction pathwaysPP1Endogenous substratesProduct inhibitorsMolecular modeling analysisSer-ThrAcid classPP2AImportant roleComputer-generated modelsInhibitorsSubunitsProteinPathway
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