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Functional chimeric HN glycoproteins derived from Newcastle disease virus and human parainfluenza virus-3

R Deng1, A M Mirza, P J Mahon

  • 1Department of Molecular Genetics and Microbiology, University of Massachusetts Medical School, Worcester, USA.

Archives of Virology. Supplementum
|January 1, 1997
PubMed

Insights

Researchers explored how Newcastle disease virus (NDV) and human parainfluenza virus type 3 (hPIV3) fusion proteins interact. The stalk region of the hemagglutinin-neuraminidase (HN) protein is crucial for maintaining the structure and function of the globular domain.

Area of Science:

  • Virology
  • Molecular Biology
  • Structural Biology

Background:

  • Newcastle disease virus (NDV) and human parainfluenza virus type 3 (hPIV3) are respiratory pathogens that infect birds and humans, respectively.
  • Viral entry into host cells is mediated by hemagglutinin-neuraminidase (HN) and fusion (F) glycoproteins, requiring homologous origins for fusion promotion.
  • Understanding HN and F protein interactions is key to deciphering viral entry mechanisms.

Purpose of the Study:

  • To investigate the functional roles of different domains within the HN proteins of NDV and hPIV3.
  • To determine how chimeric HN proteins, composed of domains from both viruses, affect viral fusion and receptor binding.
  • To identify the specific regions of the HN protein responsible for fusion specificity.

Main Methods:

  • Construction of chimeric HN proteins by combining domains from NDV and hPIV3 HN proteins.
  • Evaluation of chimeric HN proteins' ability to bind cellular receptors in a transient expression system.
  • Assessment of chimeric HN proteins' capacity to complement the F protein in promoting viral fusion.

Main Results:

  • Fusion specificity was found to be associated with a specific segment of the HN protein, from the middle of the transmembrane anchor to the top of the ectodomain's stalk region.
  • Chimeric HN proteins with NDV-derived globular domains and varying lengths of hPIV3-derived stalk regions retained receptor binding activity.
  • A decrease in neuraminidase (NA) activity was observed in some chimeras, correlating with alterations in the globular domain's antigenic structure, suggesting the stalk region's importance.

Conclusions:

  • The stalk region of the HN protein plays a critical role in maintaining the structural integrity and functional activity of its globular domain.
  • Chimeric HN proteins provide insights into the structure-function relationships governing viral fusion and host cell entry.
  • These findings contribute to a deeper understanding of viral glycoprotein interactions and potential targets for antiviral strategies.

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