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Open AccessArticle

Efficient Expression and Processing of Ebola Virus Glycoprotein Induces Morphological Changes in BmN Cells but Cannot Rescue Deficiency of Bombyx Mori Nucleopolyhedrovirus GP64

1
Jiangsu Key Laboratory of Sericultural Biology and Biotechnology, School of Biotechnology, Jiangsu University of Science and Technology, Zhenjiang 212018, China
2
Key Laboratory of Genetic Improvement of Sericulture in the Ministry of Agriculture, Sericultural Research Institute, Chinese Academy of Agricultural Science, Zhenjiang 212018, China
*
Author to whom correspondence should be addressed.
Viruses 2019, 11(11), 1067; https://doi.org/10.3390/v11111067
Received: 21 August 2019 / Revised: 13 November 2019 / Accepted: 14 November 2019 / Published: 15 November 2019
(This article belongs to the Collection Advances in Ebolavirus, Marburgvirus, and Cuevavirus Research)
Ebola virus (EBOV) disease outbreaks have resulted in many fatalities, yet no licensed vaccines are available to prevent infection. Recombinant glycoprotein (GP) production may contribute to finding a cure for Ebola virus disease, which is the key candidate protein for vaccine preparation. To explore GP1,2 expression in BmN cells, EBOV-GP1,2 with its native signal peptide or the GP64 signal peptide was cloned and transferred into a normal or gp64 null Bombyx mori nucleopolyhedrovirus (BmNPV) bacmid via transposition. The infectivity of the recombinant bacmids was investigated after transfection, expression and localization of EBOV-GP were investigated, and cell morphological changes were analyzed by TEM. The GP64 signal peptide, but not the GP1,2 native signal peptide, caused GP1,2 localization to the cell membrane, and the differentially localized GP1,2 proteins were cleaved into GP1 and GP2 fragments in BmN cells. GP1,2 expression resulted in dramatic morphological changes in BmN cells in the early stage of infection. However, GP1,2 expression did not rescue GP64 deficiency in BmNPV infection. This study provides a better understanding of GP expression and processing in BmN cells, which may lay a foundation for EBOV-GP expression using the BmNPV baculovirus expression system. View Full-Text
Keywords: Ebola virus; glycoprotein; baculovirus; signal peptide Ebola virus; glycoprotein; baculovirus; signal peptide
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Huang, J.; Liu, N.; Xu, F.; Ayepa, E.; Amanze, C.; Sun, L.; Shen, Y.; Yang, M.; Yang, S.; Shen, X.; Hao, B. Efficient Expression and Processing of Ebola Virus Glycoprotein Induces Morphological Changes in BmN Cells but Cannot Rescue Deficiency of Bombyx Mori Nucleopolyhedrovirus GP64. Viruses 2019, 11, 1067.

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