Expression of hepatitis B surface antigen in saccharomyces cerevisiae

The genome of HBV virus of serotype ayw cloned in pBR322 and expression shuttle vector pYES2 were used for construction of the HBsAg chimeric genes and their expression in Saccharomyces cerevisiae. Two recombinant plasmids were constructed. One of them contained the coding sequences for the major polypeptide of surface antigen. Another construct carried the major polypeptide with the pre-S2 antigenic determinant. These vectors were transferred into the yeast. Only pDF1 which contained the HBsAg gene was expressed. Some peculiar features of recombinant plasmid construction and expression of the HBsAg gene are discussed

Isolation, subtype determination, cloning and expression of HB s Ag gene from an Iranian carrier in saccharomyces cerevisiae

The Hepatitis B Surface antigen [HBsAg] gene was isolated from an Iranian HBsAg positive carrier by PCR. The gene was cloned in pUC19 for sequencing and pYES2 for expression in Saccharomyces cerevisiae, which pNFl and pDF3 constructs were made respectively. The sequencing data showed that the isolated HBsAg gene shared more than 90% homology with the ayw subtype. The pDF3 was transferred into the yeast strain and expression of the HBsAg was induced. Yeast-derived HBsAg was purified by immunoaffinity chromatography and checked by ELISA, Western blot analysis and confirmatory ELISA. The immunogenicity test in mice showed that injection of the yeast-derived recombinant HBsAg could induce the immunologic response against the antigen. 320 fold dilution of the mouse serum was positive for anti-HBsAg. The amount of HBsAg expressed in yeast constitute 1% of the total cell soluble protein