6533b81ffe1ef96bd1277d1a

RESEARCH PRODUCT

Rac1 and PAK1 are upstream of IKK-ε and TBK-1 in the viral activation of interferon regulatory factor-3

Walter J. WurzerStephan LudwigStephan PleschkaChristian KardinalOliver PlanzChristoph Von Eichel-streiberChristina EhrhardtThorsten Wolff

subject

rac1 GTP-Binding ProteinTranscription GeneticBiophysicsIκB kinaseProtein Serine-Threonine KinasesSignal transductionBiologyVirus ReplicationBiochemistryCell LineDogsPAK1Structural BiologyInterferonGeneticsmedicineAnimalsHumansPhosphorylationPromoter Regions Geneticp21-activated kinasesMolecular BiologyRNA Double-StrandedKinaseRho GTPaseI-Kappa-B KinaseNuclear ProteinsInterferon-betaCell BiologyCREB-Binding ProteinI-kappa B KinaseDNA-Binding ProteinsEnzyme Activationp21-Activated KinasesInfluenza A virusViral infectionAnti-viral responseTrans-ActivatorsCancer researchInterferon Regulatory Factor-3Transcription factorSignal transductionDimerizationTranscription FactorsInterferon regulatory factorsmedicine.drug

description

The anti-viral type I interferon (IFN) response is initiated by the immediate induction of IFN beta, which is mainly controlled by the IFN-regulatory factor-3 (IRF-3). The signaling pathways mediating viral IRF-3 activation are only poorly defined. We show that the Rho GTPase Rac1 is activated upon virus infection and controls IRF-3 phosphorylation and activity. Inhibition of Rac1 leads to reduced IFN beta promoter activity and to enhanced virus production. As a downstream mediator of Rac signaling towards IRF-3, we have identified the kinase p21-activated kinase (PAK1). Furthermore, both Rac1 and PAK1 regulate the recently described IRF-3 activators, I kappa B kinase- and TANK-binding kinase-1, establishing a first canonical virus-induced IRF-3 activating pathway.

yearjournalcountryeditionlanguage
2004-05-08FEBS Letters
https://doi.org/10.1016/j.febslet.2004.04.069