Key result
MEG-1076 construct increases sapovirus VLP yields ~6-fold vs native construct in insect cells.
A specific mutation in the sapovirus recombinant capsid protein construct increases its expression and VLP yield in insect cells.
May enhance sapovirus VLP manufacturing efficiency; leaves open immunogenicity, efficacy, and clinical translation.
Human sapovirus (SaV), an agent of human gastroenteritis, cannot be grown in cell culture, but expression of the recombinant capsid protein (rVP1) in a baculovirus expression system results in the formation of virus-like particles (VLPs). In this study we compared the time-course expression of two different SaV rVP1 constructs. One construct had the native sequence (Wt construct), whereas the other had two nucleotide point mutations in which one mutation caused an amino acid substitution and one was silent (MEG-1076 construct). While both constructs formed VLPs morphologically similar to native SaV, Northern blot analysis indicated that the MEG-1076 rVP1 mRNA had increased steady-state levels. Furthermore, Western blot analysis and an antigen enzyme-linked immunosorbent assay showed that the MEG-1076 construct had increased expression levels of rVP1 and yields of VLPs. Interestingly, the position of the mutated residue was strictly conserved residue among other human SaV strains, suggesting an important role for rVP1 expression.
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Hansman et al. (2005) studied Human sapovirus (SaV) expression. MEG-1076 construct (mutated SaV rVP1) vs. Wt construct (native sequence) was evaluated on Expression levels of rVP1 and yields of virus-like particles (VLPs). The MEG-1076 construct with a single amino acid substitution increased the yields of sapovirus virus-like particles by approximately 6-fold compared to the native construct in insect cells.
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