Design of Lactococcus lactis strains producing S protein or receptor-binding domain of the SARSCoV-2 virus
Abstract
We obtained recombinant bacterial strains of Lactococcus lactis containing expression plasmids with fragments of the SARS-CoV-2 virus genome. The pNZ::spike vector construction contains the complete coding sequence of the S protein gene of the SARS-CoV-2 virus, the vector constructions pNZ::mini-spike and pNZ::HA-spike contain s gene fragments with different codon composition and size, which translated into the receptor-binding domain. Induction of s gene fragment expression in cells of the obtained strains by nisin (1 ng/ml) is followed by the synthesis of proteins specifically binding to commercial antibodies against the receptor-binding domain of the SARS-CoV-2 virus. Recombinant proteins produced by the bacteria L. lactis pNZ::spike are represented by several fractions, a molecular mass of the major fraction is about 150 kDa, which coincides with the theoretically calculated molecular mass of the full-length S protein. The bacteria L. lactis pNZ::HA-spike synthesised the recombinant protein with a molecular mass of approximately 23 kDa. In L. lactis pNZ::mini-spike cells the target protein is represented by a major fraction with a molecular mass of about 35 kDa. The produced recombinant proteins have cellular localisation.
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