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  • 1.
    Wigerius, Michael
    et al.
    Södertörn University, School of Life Sciences, Chemistry. Södertörn University, School of Life Sciences, Molecular biology.
    Melik, Wessam
    Södertörn University, School of Life Sciences, Chemistry. Södertörn University, School of Life Sciences, Molecular biology.
    Elväng, Annelie
    Södertörn University, School of Life Sciences, Molecular biology.
    Johansson, Magnus
    Södertörn University, School of Life Sciences, Chemistry. Södertörn University, School of Life Sciences, International health.
    Rac1 and Scribble are targets for the arrest of neurite outgrowth by TBE virus NS52010In: Molecular and Cellular Neuroscience, ISSN 1044-7431, E-ISSN 1095-9327, Vol. 44, no 3, p. 260-271Article in journal (Refereed)
    Abstract [en]

    Tick-borne encephalitis virus (TBEV) causes extensive CNS disease in humans known as TBE, however, relatively little is known of the molecular mechanisms for its progress. Here, we now show that TBEV produces defects in neuronal development of PC12 cells through a function of the viral NS5 protein. The methyltransferase domain of NS5 is critical and sufficient for restriction of nerve growth factor induced neurite outgrowth. This effect is reversed by expression of NS5 mutants unable to bind Scribble and unexpectedly, in Scribble depleted cells with binding-competent NS5. Furthermore, we also demonstrate that the Rho GTPase Rac1 and the guanine nucleotide-exchange factor, beta PIX are outcompeted by NS5 for binding to Scribble, linking to effects on neurite outgrowth by TBEV. Together, these findings provide the first experimental evidence that Rac1 and beta PIX are indirect targets of NS5 acting through the multifunctional polarity protein Scribble to oppose neuronal differentiation. In conclusion, our results offer a potential mechanism by which TBEV alters neuronal circuitry and opens new avenues for therapeutic interventions.

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