A Herpesvirus Protein Selectively Inhibits Cellular mRNA Nuclear Export

Cell Host Microbe. 2016 Nov 9;20(5):642-653. doi: 10.1016/j.chom.2016.10.004.

Abstract

Nuclear mRNA export is highly regulated to ensure accurate cellular gene expression. Viral inhibition of cellular mRNA export can enhance viral access to the cellular translation machinery and prevent anti-viral protein production but is generally thought to be nonselective. We report that ORF10 of Kaposi's sarcoma-associated herpesvirus (KSHV), a nuclear DNA virus, inhibits mRNA export in a transcript-selective manner to control cellular gene expression. Nuclear export inhibition by ORF10 requires an interaction with an RNA export factor, Rae1. Genome-wide analysis reveals a subset of cellular mRNAs whose nuclear export is blocked by ORF10 with the 3' UTRs of ORF10-targeted transcripts conferring sensitivity to export inhibition. The ORF10-Rae1 interaction is important for the virus to express viral genes and produce infectious virions. These results suggest that a nuclear DNA virus can selectively interfere with RNA export to restrict host gene expression for optimal replication.

Keywords: 3′ UTR; KSHV; Nup98; ORF10; Rae1; herpesvirus; late gene; mRNA nuclear export.

MeSH terms

  • Active Transport, Cell Nucleus*
  • Animals
  • Cell Line
  • Gene Expression Regulation
  • Herpesvirus 8, Human / physiology*
  • Host-Pathogen Interactions*
  • Humans
  • Models, Biological
  • Nuclear Matrix-Associated Proteins / metabolism*
  • Nucleocytoplasmic Transport Proteins / metabolism*
  • Protein Binding
  • RNA, Messenger / metabolism*
  • Viral Proteins / metabolism*
  • Virus Replication*

Substances

  • Nuclear Matrix-Associated Proteins
  • Nucleocytoplasmic Transport Proteins
  • RAE1 protein, human
  • RNA, Messenger
  • Viral Proteins