A single amino acid in the F2 subunit of respiratory syncytial virus fusion protein alters growth and fusogenicity

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Abstract

Respiratory syncytial virus (RSV) causes severe lower respiratory tract infection in children, especially in infants less than 1 year of age. There are currently no licensed vaccines against RSV. rA2δM2-2 is a promising live-attenuated vaccine candidate that is currently being evaluated in the clinic. Attenuation of rA2δM2-2 is achieved by a single deletion of the M2-2 gene, which disrupts the balance between viral transcription and replication. Whilst performing a manufacturing feasibility study in a serum-free adapted Vero cell line, differences in growth kinetics and cytopathic effect (CPE) were identified between two rA2δM2-2 vaccine candidates. Comparative sequence analysis identified four amino acid differences between the two vaccine viruses. Recombinant rA2δM2-2 viruses carrying each of the four amino acid differences identified a K66E mutation in the F2 fragment of the fusion (F) protein as the cause of the growth and CPE differences. Syncytium-formation experiments with RSV F protein carrying mutations at aa 66 suggested that a change in charge at this residue within the F2 fragment can have a significant impact on fusion. © 2013 SGM.

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APA

Lawlor, H. A., Schickli, J. H., & Tang, R. S. (2013). A single amino acid in the F2 subunit of respiratory syncytial virus fusion protein alters growth and fusogenicity. Journal of General Virology, 94(PART 12), 2627–2635. https://doi.org/10.1099/vir.0.055368-0

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