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Expression of hepatitis B surface antigen in yeast
Developments in Biological Standardization
|January 1, 1983
Summary
Researchers engineered yeast to produce Hepatitis B surface antigen (HBsAg) by fusing viral genes with yeast DNA. This produced HBsAg-like material that triggered antibody production in rabbits, paving the way for vaccine development.
Area of Science:
- * Molecular biology
- * Virology
- * Biotechnology
Background:
- * Hepatitis B virus (HBV) poses a significant global health challenge.
- * Production of Hepatitis B surface antigen (HBsAg) is crucial for vaccine development.
- * Current methods for HBsAg production can be complex and costly.
Purpose of the Study:
- * To develop a novel method for producing HBsAg using a yeast expression system.
- * To create a recombinant DNA construct for efficient HBsAg synthesis in yeast.
- * To characterize the properties of the yeast-expressed HBsAg.
Main Methods:
- * Cloning of HBV genomes from two serotypes into E. coli.
- * Fusion of HBsAg coding sequences with the yeast arg3 gene.
- * Introduction of hybrid genes into yeast using a suitable vector.
- * Characterization of the expressed fusion protein using isopycnic and rate zonal centrifugation.
- * Immunization of rabbits with yeast extracts to assess antibody response.
Main Results:
- * Successful synthesis of HBsAg-like fusion protein in yeast.
- * The yeast-expressed HBsAg exhibited physical properties similar to plasma-derived HBsAg.
- * Yeast extracts containing HBsAg elicited specific anti-HBsAg antibodies in rabbits.
- * Construction of a recombinant plasmid for mature HBsAg polypeptide synthesis.
Conclusions:
- * Yeast can be engineered to produce functional HBsAg.
- * This approach offers a potential alternative for HBsAg production for vaccine development.
- * Further optimization could lead to large-scale, cost-effective HBsAg manufacturing.