Ribosome Protein L4 is essential for Epstein-Barr Virus Nuclear Antigen 1 function

Proc Natl Acad Sci U S A. 2016 Feb 23;113(8):2229-34. doi: 10.1073/pnas.1525444113. Epub 2016 Feb 8.

Abstract

Epstein-Barr Virus (EBV) Nuclear Antigen 1 (EBNA1)-mediated origin of plasmid replication (oriP) DNA episome maintenance is essential for EBV-mediated tumorigenesis. We have now found that EBNA1 binds to Ribosome Protein L4 (RPL4). RPL4 shRNA knockdown decreased EBNA1 activation of an oriP luciferase reporter, EBNA1 DNA binding in lymphoblastoid cell lines, and EBV genome number per lymphoblastoid cell line. EBV infection increased RPL4 expression and redistributed RPL4 to cell nuclei. RPL4 and Nucleolin (NCL) were a scaffold for an EBNA1-induced oriP complex. The RPL4 N terminus cooperated with NCL-K429 to support EBNA1 and oriP-mediated episome binding and maintenance, whereas the NCL C-terminal K380 and K393 induced oriP DNA H3K4me2 modification and promoted EBNA1 activation of oriP-dependent transcription. These observations provide new insights into the mechanisms by which EBV uses NCL and RPL4 to establish persistent B-lymphoblastoid cell infection.

Keywords: EBNA1; EBV; NCL; RPL4; oriP.

Publication types

  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't

MeSH terms

  • B-Lymphocytes / metabolism
  • B-Lymphocytes / virology
  • Cell Line
  • DNA, Viral / genetics
  • DNA, Viral / metabolism
  • Epstein-Barr Virus Nuclear Antigens / genetics
  • Epstein-Barr Virus Nuclear Antigens / metabolism*
  • Gene Knockdown Techniques
  • Genome, Viral
  • Herpesvirus 4, Human / genetics
  • Herpesvirus 4, Human / metabolism*
  • Herpesvirus 4, Human / pathogenicity
  • Host-Pathogen Interactions
  • Humans
  • Nucleolin
  • Phosphoproteins / genetics
  • Phosphoproteins / metabolism
  • Plasmids / genetics
  • Plasmids / metabolism
  • RNA, Small Interfering / genetics
  • RNA-Binding Proteins / genetics
  • RNA-Binding Proteins / metabolism
  • Replication Origin
  • Ribosomal Proteins / antagonists & inhibitors
  • Ribosomal Proteins / genetics
  • Ribosomal Proteins / metabolism*
  • Transcriptional Activation

Substances

  • DNA, Viral
  • Epstein-Barr Virus Nuclear Antigens
  • Phosphoproteins
  • RNA, Small Interfering
  • RNA-Binding Proteins
  • Ribosomal Proteins
  • ribosomal protein L4
  • EBV-encoded nuclear antigen 1