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Hepatitis B is a widespread viral disease. In the absence of cell cultures capable of propagating the virus (HBV) an efficient vaccine has been prepared from viral envelopes isolated from the plasma of chronic carriers. The major polypeptide of the envelope is one of molecular weight 25,000 which carries the surface antigen (HBsAg). Therefore, the biosynthesis of this polypeptide in Escherichia coli may offer an alternative procedure to produce HbsAg free from human proteins. Recently, the HBV genome has been cloned in E.coli. Determination of its primary structure allowed the localization of the gene (called gene S) coding for HBsAg and the synthesis of the core antigen in E.coli has been reported. We have constructed a derivative of bacteriophage lambda carrying a fusion between the beta-galactosidase gene (lacZ) and the HBsAg coding sequence (lambdalacHBs-1). Infection of E.coli with lambdalacHBs-1 leads to the biosynthesis of a polypeptide of molecular weitht 138,000 carrying antigenic determinants of HBV surface antigen.
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