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  • The EMBO Journal (2008) 27, 1289 - 1298
  • doi:10.1038/emboj.2008.60

Published online: 27 March 2008

Peptides released from reovirus outer capsid form membrane pores that recruit virus particles

Tijana Ivanovic1,2, Melina A Agosto1,3, Lan Zhang4,6, Kartik Chandran1,7, Stephen C Harrison2,3,4,5 and Max L Nibert1,2,3

  1. Department of Microbiology and Molecular Genetics, Harvard Medical School, Boston, MA, USA
  2. Training Program in Virology, Harvard University, Boston, MA, USA
  3. Training Program in Biological and Biomedical Sciences, Harvard University, Boston, MA, USA
  4. Department of Molecular Medicine, Children's Hospital, Boston, MA, USA
  5. Howard Hughes Medical Institute, Children's Hospital, Boston, MA, USA

Correspondence to:

Max L Nibert, Department of Microbiology and Molecular Genetics, Harvard Medical School, 200 Longwood Avenue, Boston, MA 02115, USA. Tel.: +1 617 432 4838; Fax: +1 617 738 7664; E-mail: mnibert@hms.harvard.edu

6Present address: Vaccine Basic Research, Merck & Co. Inc., West Point, PA 19486, USA

7Present address: Department of Microbiology and Immunology, Albert Einstein College of Medicine, Bronx, NY 10461, USA

Received 31 October 2007; Accepted 27 February 2008

Nonenveloped animal viruses must disrupt or perforate a cell membrane during entry. Recent work with reovirus has shown formation of size-selective pores in RBC membranes in concert with structural changes in capsid protein mu1. Here, we demonstrate that mu1 fragments released from reovirus particles are sufficient for pore formation. Both myristoylated N-terminal fragment mu1N and C-terminal fragment phi are released from particles. Both also associate with RBC membranes and contribute to pore formation in the absence of particles, but mu1N has the primary and sufficient role. Particles with a mutant form of mu1, unable to release mu1N or form pores, lack the ability to associate with membranes. They are, however, recruited by pores preformed with peptides released from wild-type particles or with synthetic mu1N. The results provide evidence that docking to membrane pores by virus particles may be a next step in membrane penetration after pore formation by released peptides.

  • Keywords:

    • cell entry,
    • membrane penetration,
    • membrane pore,
    • nonenveloped virus,
    • reoviridae