期刊
JOURNAL OF VIROLOGICAL METHODS
卷 205, 期 -, 页码 116-123出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jviromet.2014.04.019
关键词
Dengue virus; Virus-like particle; Vaccine candidate; Transfection; Insect cell lines
资金
- National Science and Technology Development Agency, Thailand [BT-01-MG-10-5037, BT-01-MG-10-5127]
Recombinant virus-like particles (rVLPs) of flaviviruses are non-infectious particles released from cells expressing the envelope glycoproteins prM and E. Dengue virus rVLPs are recognized as a potential vaccine candidate, but large scale production of these particles is hindered by low yields and the occurrence of cytopathic effects. In an approach to improve the yield of rVLPs from transfected insect cells, several components of a dengue serotype 2 virus prM + E expression cassette were modified and the effect of these modifications was assessed during transient expression. Enhancement of extracellular rVLP levels by simultaneous substitutions of the prM signal peptide and the stem-anchor region of E with homologous cellular and viral counterparts, respectively, was further augmented by codon optimization. Extensive formation of multinucleated cells following transfection with the codon-optimized expression cassette was abrogated by introducing an E fusion loop mutation. This mutation also helped restore the extracellular E levels affected negatively by alteration of a charged residue at the pr-M junction, which was intended to promote maturation of rVLPs during export. Optimized expression cassettes generated in this multiple add-on modification approach should be useful in the generation of stably expressing clones and production of dengue virus rVLPs for immunogenicity studies. (C) 2014 Elsevier B.V. All rights reserved.
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