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Related Experiment Videos

Process options in hepatitis B surface antigen extraction from transgenic potato.

B Dogan1, H S Mason, L Richter

  • 1Department of Food Science, Boyce Thompson Institute, Cornell University, Ithaca, New York 14853, USA.

Biotechnology Progress
|June 3, 2000
PubMed
Summary

Optimizing extraction of recombinant hepatitis B surface antigen (HBsAg) from transgenic potatoes involves specific temperature and beta-mercaptoethanol (BME) treatments. These conditions enhance antigenic activity, crucial for vaccine development.

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Area of Science:

  • Biotechnology
  • Molecular Biology
  • Vaccine Development

Background:

  • Recombinant hepatitis B surface antigen (HBsAg) production in transgenic plants offers a novel platform for vaccine manufacturing.
  • Understanding extraction and purification processes is key to maximizing antigen yield and activity.

Purpose of the Study:

  • To investigate and optimize process conditions for extracting active HBsAg from transgenic potato plants.
  • To characterize the effects of temperature, reducing agents, and proteinase inhibitors on HBsAg antigenic activity and particle assembly.

Main Methods:

  • Assessing HBsAg antigenic activity using monoclonal and polyclonal antibodies.
  • Evaluating the impact of temperature (up to 50°C) and beta-mercaptoethanol (BME) on antigen recovery.
  • Employing sedimentation profiles to analyze HBsAg assembly into virus-like particles.

Related Experiment Videos

  • Testing various proteinase inhibitors (leupeptin, aprotinin, E-64, pefabloc, pepstatin) for their protective effects.

    • Main Results:

    • Optimal temperature for HBsAg extraction was found to be around 50°C, yielding a 3-fold increase in antigenic activity with monoclonal antibodies.
    • Beta-mercaptoethanol (BME) enhanced antigenic activity up to 4-fold, particularly with monoclonal antibodies targeting the 'a' epitope.
    • Combined application of temperature and BME showed antagonistic effects, reducing overall activity.
    • Leupeptin, in conjunction with BME, further increased antigenic activity, suggesting protection against proteolysis.
    • Sedimentation profiles confirmed that potato-derived HBsAg self-assembles into virus-like particles, similar to yeast-derived controls.

    Conclusions:

    • Specific process conditions, including controlled temperature and BME treatment, significantly enhance the antigenic activity of recombinant HBsAg from transgenic potatoes.
    • The 'a' epitope's conformation or presentation is sensitive to temperature and BME.
    • HBsAg in transgenic potatoes forms virus-like particles, indicating proper assembly for potential vaccine applications.
    • Further optimization is needed to balance the individual benefits of temperature and BME for maximal HBsAg recovery.