Baculovirus envelope fusion proteins F and GP64 exploit distinct receptors to gain entry into cultured insect cells

M. Westenberg, P. Uijtdewilligen, J.M. Vlak

Research output: Contribution to journalArticleAcademicpeer-review

25 Citations (Scopus)

Abstract

Group II nucleopolyhedroviruses (NPVs), e.g. Helicoverpa armigera (Hear) NPV and Spodoptera exigua (Se) MNPV (multiple NPV), lack a GP64-like protein that is present in group I NPVs, e.g. Autographa californica (Ac)MNPV, but have an unrelated envelope fusion protein named F. Three AcMNPV viruses were constructed by introducing AcMNPV gp64, HearNPV f or SeMNPV f genes, respectively, into a gp64-negative AcMNPV bacmid. Sf21 cells were incubated with different amounts of inactivated budded virus to occupy receptors and were subsequently infected with a fixed amount of infectious virus to compete for attachment. The results suggest that GP64 and F act on their own and use different receptors, while the two different F proteins exploit the same receptor. Additionally, gp64-null AcMNPV pseudotyped with baculovirus F was, in contrast to GP64, unable to transduce mammalian cells, indicating that mammalian cells do not possess baculovirus F protein receptors despite the structural similarity of baculovirus F to vertebrate viral fusion proteins.
Original languageEnglish
Pages (from-to)3302-3306
JournalJournal of General Virology
Volume88
DOIs
Publication statusPublished - 2007

Keywords

  • nuclear polyhedrosis-virus
  • californica multicapsid nucleopolyhedrovirus
  • membrane-fusion
  • recombinant baculovirus
  • lymantria-dispar
  • mammalian-cells
  • genome sequence
  • lines
  • glycoprotein
  • mechanism

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