Functional analysis of porcine reproductive and respiratory syndrome virus N-glycans in infection of permissive cells

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6 Scopus citations

Abstract

The role of envelope protein-linked N-glycans in porcine reproductive and respiratory syndrome virus (PRRSV) infection of permissive cells was examined. N-acetylglucosamine (GlcNAc) and N-acetyllactosamine (LacNAc) oligomer-specific lectins bound to PRRSV and blocked virus attachment, resulting in reduced viral infection. However, addition of GlcNAc oligomers and LacNAc to cell culture together with PRRSV did not block infection. Removal or alteration of envelope protein-linked N-glycans also did not affect virus infection, indicating that PRRSV N-glycans are not required for virus infection. These findings show that steric hindrance of glycans on the PRRSV envelope by lectins or, presumably, other space-filling molecules, may interfere nonspecifically with infection by blocking protein interactions with cell surface receptors. Glycans themselves appear not to be required for infection of permissive cells, but may have important roles in avoidance of host immunity and in protein structure, intracellular virion growth and assembly.

Original languageEnglish (US)
Pages (from-to)82-88
Number of pages7
JournalVirology
Volume477
DOIs
StatePublished - Mar 1 2015

Bibliographical note

Funding Information:
The work was funding in part by grant number 09-227 from the U.S. National Pork Board and USDA NIFA multistate project MIN 63-084 .

Publisher Copyright:
© 2015 Elsevier Inc.

Keywords

  • Envelope glycoprotein
  • GlcNAc oligomer
  • LacNAc oligomer
  • N-glycan
  • PRRSV
  • Sialic acid
  • Virus infectivity

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