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Marburg virus VP35 can both fully coat the backbone and cap the ends of dsRNA for interferon antagonism

Academic Article
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Overview

related to degree

  • Kimberlin, Chris, Ph.D. in Biology, Scripps Research 2004 - 2010

authors

  • Bale, S.
  • Julien, J. P.
  • Bornholdt, Zachary
  • Kimberlin, Chris
  • Halfmann, P.
  • Zandonatti, M. A.
  • Kunert, J.
  • Kroon, G. J. A.
  • Kawaoka, Y.
  • MacRae, Ian
  • Wilson, Ian
  • Saphire, Erica Ollmann

publication date

  • September 2012

journal

  • PLoS Pathogens  Journal

abstract

  • Filoviruses, including Marburg virus (MARV) and Ebola virus (EBOV), cause fatal hemorrhagic fever in humans and non-human primates. All filoviruses encode a unique multi-functional protein termed VP35. The C-terminal double-stranded (ds)RNA-binding domain (RBD) of VP35 has been implicated in interferon antagonism and immune evasion. Crystal structures of the VP35 RBD from two ebolaviruses have previously demonstrated that the viral protein caps the ends of dsRNA. However, it is not yet understood how the expanses of dsRNA backbone, between the ends, are masked from immune surveillance during filovirus infection. Here, we report the crystal structure of MARV VP35 RBD bound to dsRNA. In the crystal structure, molecules of dsRNA stack end-to-end to form a pseudo-continuous oligonucleotide. This oligonucleotide is continuously and completely coated along its sugar-phosphate backbone by the MARV VP35 RBD. Analysis of dsRNA binding by dot-blot and isothermal titration calorimetry reveals that multiple copies of MARV VP35 RBD can indeed bind the dsRNA sugar-phosphate backbone in a cooperative manner in solution. Further, MARV VP35 RBD can also cap the ends of the dsRNA in solution, although this arrangement was not captured in crystals. Together, these studies suggest that MARV VP35 can both coat the backbone and cap the ends, and that for MARV, coating of the dsRNA backbone may be an essential mechanism by which dsRNA is masked from backbone-sensing immune surveillance molecules.

subject areas

  • Cell Line
  • Crystallography, X-Ray
  • Ebolavirus
  • HEK293 Cells
  • Humans
  • Immune Evasion
  • Interferons
  • Marburgvirus
  • Models, Molecular
  • Protein Binding
  • Protein Structure, Tertiary
  • RNA, Double-Stranded
  • RNA-Binding Proteins
  • Viral Regulatory and Accessory Proteins
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Identity

PubMed Central ID

  • PMC3441732

International Standard Serial Number (ISSN)

  • 1553-7374

Digital Object Identifier (DOI)

  • 10.1371/journal.ppat.1002916

PubMed ID

  • 23028316
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Additional Document Info

start page

  • e1002916

volume

  • 8

issue

  • 9

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