Open reading frame 132 of Helicoverpa armigera nucleopolyhedrovirus encodes a functional per os infectivity factor (PIF-2)

M. Fang, Y. Nie, Q. Wang, F. Deng, R. Wang, H. Wang, J.M. Vlak, X. Chen, Z.H. Hu

Research output: Contribution to journalArticleAcademicpeer-review

28 Citations (Scopus)

Abstract

Open reading frame 132 (Ha132) of Helicoverpa armigera nucleopolyhedrovirus (HearNPV) is a homologue of per os infectivity factor 2 (pif-2) of Spodoptera exigua multiple nucleopolyhedrovirus. Sequence analysis indicated that Ha132 encoded a protein of 383 aa with a predicted molecular mass of 44.5 kDa. Alignment of HA132 and its baculovirus homologues revealed that HA132 was highly conserved among baculoviruses, with 14 absolutely conserved cysteine residues. RT-PCR indicated that Ha132 was first transcribed at 24 h post-infection. Western blot analysis showed that a 43 kDa band was detectable in HearNPV-infected HzAM1 cells from 36 h post-infection. Western blots also indicated that HA132 was a component of the occlusion-derived virus, but not of budded virus. Deletion of Ha132 from HearNPV abolished per os infectivity, but had no effect on the infectivity of the budded virus phenotype
Original languageEnglish
Pages (from-to)2563-2569
JournalJournal of General Virology
Volume87
Issue number9
DOIs
Publication statusPublished - 2006

Keywords

  • occlusion-derived virus
  • single-nucleocapsid nucleopolyhedrovirus
  • autographa-californica nucleopolyhedrovirus
  • nuclear polyhedrosis-virus
  • heliothis-virescens larvae
  • envelope protein p74
  • multiple nucleopolyhedrovirus
  • orgyia-pseudotsugata
  • nucleotide-s

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