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Helicoverpa armigera nucleopolyhedrovirus ORF80 encodes a late, nonstructural protein

Dun Wang1, Chuan-Xi Zhang

  • 1Institute of Insect Sciences, Zhejiang University, Hangzhou, 310029, P.R. China.

Journal of Biochemistry and Molecular Biology
|January 25, 2007
PubMed

Insights

The function of Helicoverpa armigera nucleopolyhedrovirus (HearNPV) ORF80 (ha80) was investigated. This study revealed ha80 protein localizes to the nucleus, suggesting a role in viral nuclear transport.

Area of Science:

  • Virology
  • Molecular Biology
  • Insect Pathology

Background:

  • The function of baculovirus genes, such as HearNPV ORF80 (ha80), remains largely unknown despite their prevalence across various baculovirus species.
  • Homologues of ha80 are present in numerous baculovirus sequences, indicating conserved importance.

Purpose of the Study:

  • To characterize the Helicoverpa armigera nucleopolyhedrovirus ORF80 (ha80) gene and its protein product.
  • To elucidate the temporal and spatial expression of ha80 during viral infection.

Main Methods:

  • Analysis of ha80 gene sequence and predicted protein characteristics.
  • Detection of ha80 transcription late in infected HzAM1 cells.
  • Western blot analysis to identify the ha80 protein product.
  • Immunofluorescence microscopy to determine protein localization within infected host cells.

Main Results:

  • The ha80 gene encodes a 31 kDa protein.
  • The ha80 protein is not a structural component of budded virus (BV) or occlusion-derived virus (ODV) particles.
  • Ha80 is initially detected in the cytoplasm at 12 hours post-infection (p.i.) and subsequently found in the nucleus at later stages.

Conclusions:

  • The late transcription and nuclear localization of the ha80 protein suggest a potential role in the transport of viral proteins into the host cell nucleus.
  • Ha80 may play a crucial role in nuclear-associated viral processes during HearNPV infection.

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