Virology, Nebraska Center for

 

Date of this Version

4-12-2006

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Published in Vaccine 24:16 (April 12, 2006), pp. 3388–3395; doi 10.1016/j.vaccine.2005.12.067 Copyright © 2006 Elsevier Ltd. Used by permission. http://0-www.sciencedirect.com/science/journal/0264410X A contribution of the University of Nebraska Agricultural Research Division, Lincoln, NE 68583.

Abstract

Bovine respiratory syncytial virus (BRSV) is an etiological component of the bovine respiratory tract disease complex. Infection with BRSV following vaccination, or re-infection following natural infection is common since protection is incomplete. The objectives of this study were to create plasmid DNA constructs encoding single or multiple N-glycosylation-site deletion BRSV fusion (F) proteins, and evaluate their expression in cell culture, and potential to induce anti-BRSV F antibody responses in BALB/ c mice. Four plasmid DNAs were constructed, each encoding 1-4 N-glycosylation-site deletions: Gly4, Gly2/4, Gly1/2/4 and Gly1/2/3/4. Each of the N-glycosylation-site deletion BRSV F proteins were expressed in COS-7 cells following transfection with plasmid DNA. Inoculation of BALB/c mice with plasmid DNA, resulted in a significant anti-BRSV F IgG response to the wildtype (WT) F and glycosylation-site deletion protein Gly2/4. Gly2/4 elicited a higher antibody titer than the fully glycosylated WT F protein. Significant neutralizing antibody titers were detected following immunization with the Gly2/4 plasmid DNA. These glycosylation-site deletion BRSV F proteins will be useful to characterize the effects of glycosylation on immunogenicity in the natural host, and may lead to a new approach for the generation of BRSV vaccines.

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