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Assays to Demonstrate the Roles of Arenaviral Nucleoproteins (NPs) in Viral RNA Synthesis and in Suppressing Type I Interferon

Part of the Methods in Molecular Biology book series (MIMB,volume 1604)

Abstract

Arenaviruses, such as Lassa virus (LASV) and Pichindé virus (PICV), are enveloped viruses with a bi-segmented ambisense RNA genome. The large (L) genomic segment encodes the Z matrix protein and the L RNA-dependent RNA polymerase, whereas the small (S) genomic segment encodes the nucleoprotein (NP) and the glycoprotein (GPC). The NP encapsidates viral genome, is required for viral transcription and replication, and acts as a type I interferon (IFN) antagonist. This article describes assays to demonstrate that NP contains 3′-5′ exoribonuclease (RNase) activity to degrade modeled RNA of the pathogen-associated molecular pattern type and suppresses the IFNβ promoter-driven luciferase reporter gene. The minigenomic (MG) assay is used to assess the role of NP in replicating and transcribing a viral promoter-driven luciferase reporter gene. These powerful assays demonstrate the versatility of NP in mediating viral replication as well as in modulating host innate immune responses.

Key words

  • Lassa virus
  • Nucleoprotein
  • Arenavirus

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Acknowledgments

This work was supported in part by the NIAID/NIH through the new direction awards mechanism of the SERCEB grant (U54-AI057157) to YL and HL, and by the NIAID/NIH R01 grants AI083409 to YL and AI093580 to HL, and by R56 grant AI091805 to HL.

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Correspondence to Yuying Liang or Hinh Ly .

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Huang, Q., Shao, J., Liang, Y., Ly, H. (2018). Assays to Demonstrate the Roles of Arenaviral Nucleoproteins (NPs) in Viral RNA Synthesis and in Suppressing Type I Interferon. In: Salvato, M. (eds) Hemorrhagic Fever Viruses. Methods in Molecular Biology, vol 1604. Humana Press, New York, NY. https://doi.org/10.1007/978-1-4939-6981-4_13

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  • DOI: https://doi.org/10.1007/978-1-4939-6981-4_13

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  • Publisher Name: Humana Press, New York, NY

  • Print ISBN: 978-1-4939-6980-7

  • Online ISBN: 978-1-4939-6981-4

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