NS5 Sumoylation Directs Nuclear Responses That Permit Zika Virus To Persistently Infect Human Brain Microvascular Endothelial Cells.

Journal of Virology
Jonas N CondeErich R Mackow

Abstract

Zika virus (ZIKV) is cytopathic to neurons and persistently infects brain microvascular endothelial cells (hBMECs), which normally restrict viral access to neurons. Despite replicating in the cytoplasm, ZIKV and Dengue virus (DENV) polymerases, NS5 proteins, are predominantly trafficked to the nucleus. We found that a SUMO interaction motif in ZIKV and DENV NS5 proteins directs nuclear localization. However, ZIKV NS5 formed discrete punctate nuclear bodies (NBs), while DENV NS5 was uniformly dispersed in the nucleoplasm. Yet, mutating one DENV NS5 SUMO site (K546R) localized the NS5 mutant to discrete NBs, and NBs formed by the ZIKV NS5 SUMO mutant (K252R) were restructured into discrete protein complexes. In hBMECs, NBs formed by STAT2 and promyelocytic leukemia (PML) protein are present constitutively and enhance innate immunity. During ZIKV infection or NS5 expression, we found that ZIKV NS5 evicts PML from STAT2 NBs, forming NS5/STAT2 NBs that dramatically reduce PML expression in hBMECs and inhibit the transcription of interferon-stimulated genes (ISG). Expressing the ZIKV NS5 SUMO site mutant (K252R) resulted in NS5/STAT2/PML NBs that failed to degrade PML, reduce STAT2 expression, or inhibit ISG induction. Additionally, ...Continue Reading

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Citations

Jan 6, 2021·International Journal of Molecular Sciences·Ramesh KumarSujatha Sunil
Apr 4, 2021·Veterinary Sciences·Sabari Nath Neerukonda
Apr 4, 2021·Vaccines·Judith Estévez-HerreraAgustín Valenzuela-Fernández

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