Abstract
Respiratory syncytial virus (RSV) is a major viral pathogen responsible for severe respiratory tract infections in infants, young children, and the elderly. The RSV fusion (F) protein is highly conserved among RSV subgroups A and B and is the major protective immunogen. A genetically-engineered version of the RSV F protein was produced in insect cells using the baculovirus expression system. To express a secreted form of this protein, the transmembrane domain was eliminated by removing the region of the gene encoding 48 amino acids at the C-terminus. Production of the truncated RSV F protein (RSV-Fs) was compared in two different insect cell lines, Spodoptera frugiperda (Sf9) and Trichoplusia ni (High Five). The yield of RSV-Fs secreted from High Five insect cells was over 7-fold higher than that from Sf9 insect cells. Processing of the RSV-Fs protein was also different in the two insect cell lines. N-terminal sequencing demonstrated that while most of the RSV-Fs protein secreted by High Five cells was correctly processed at the F<$>_2<$>–F<$>_1<$> proteolytic cleavage site, most of the RSV-Fs protein secreted by Sf9 cells was unprocessed or incorrectly processed. Antigenicity of the major RSV F neutralization epitopes was maintained in the RSV-Fs protein secreted from High Five cells. The RSV-specific neutralizing antibody titres in the sera of cotton rats immunized with the RSV-Fs protein were equivalent to those in the sera of animals intranasally inoculated with live RSV. Animals immunized with either live RSV or the immunoaffinity purified RSV-Fs protein from High Five cells were completely protected against live virus challenge.
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Snell, E., Sanhueza, S., Gisonni, L. et al. Baculovirus Expression of the Respiratory Syncytial Virus Fusion Protein using Trichoplusia ni Insect Cells. Virus Genes 14, 63–72 (1997). https://doi.org/10.1023/A:1007939524088
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DOI: https://doi.org/10.1023/A:1007939524088