期刊
VIRUS RESEARCH
卷 295, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.virusres.2021.198305
关键词
COVID-19; Coronavirus; SARS-CoV-2; VLP; Virus-like particle; Retrovirus; Moloney; Vaccine
类别
资金
- BioVec Pharma, Canada
The codon optimized S protein of SARS-CoV-2 can migrate to the cell membrane. Efficient production of MLV infectious viral particles was achieved with stable expression of a shorter Delta S version. Delta S was 15-times more efficiently incorporated into VLPs compared to S, showing potential for immunization strategies for COVID-19.
In this study, we showed that a codon optimized version of the spike (S) protein of SARS-CoV-2 can migrate to the cell membrane. However, efficient production of Moloney murine leukemia (MLV) infectious viral particles was only achieved with stable expression of a shorter S version in C-terminal (Delta S) in MLV Gag-pol expressing cells. As compared to transient transfections, this platform generated viruses with a 1000-fold higher titer. Delta S was 15-times more efficiently incorporated into VLPs as compared to S, and that was not due to steric inter-ference between the cytoplasmic tail and the MLV capsid, as similar differences were also observed with extracellular vesicles. The amount of Delta S incorporated into VLPs released from producer cells was high and estimated at 1.25 mu g/mL S2 equivalent (S is comprised of S1 and S2). The resulting VLPs could potentially be used alone or as a boost of other immunization strategies for COVID-19.
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