Our previous research showed that the best yield of virus-like particles (VLPs) formed by RNA bacteriophage GA coat protein was obtained by expression in yeast Pichia pastoris, while other used expression systems in Saccharomyces cerevisiae gave much lower amounts of capsids. The main reasons to attempt further studies in Saccharomyces cerevisiae were to improve the yield of GA-based VLPs using constructs with optimised nucleotide triplets in coding sequences, and to exploit the possibilities of the two-promoter Gal1/Gal10 system of expression vector pESC-URA for production of the desired mosaic VLPs and for packaging of mRNAs into VLPs in vivo
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