Expression of Poliovirus Complementary DNA Coding for Viral Antigenic Determinants in Escherichia coli1

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Abstract
DNA sequences coding for the immunogenic capsid protein VPI and/or VP3 of poliovirus strain LSc-2ab (Sabin 1) were prepared by digesting the cloned complementary DNA with restriction endonuclease PstI . The DNA fragments were inserted into the unique PstI site of Escherichia coil plasmid vectors pBR322, pKT 280 and /or pKT 287 that lay in the region expressed under control of the penicillinase promoter system. In the expression vectors, poliovirus sequences were designed to be read in phase and therefore to be expressed as fusion proteins with the bacterial peptides. In addition, the Escherichia coil tryptophan operon promoter-operator system was inserted upstream of the penicillinase system to obtain stronger expression of the poliovirus sequences. Escherichia coil transformed with these plasmids appeared to produce the antigenic polypeptides, which were detected by immunoprecipitation with antibodies to capsid proteins VPI and /or VP3 followed by SDS-polyacrylamide gel electrophoresis.