Research Paper | Published:

Expression in Yeast of Amino-Terminal Peptide Fusions to Hepatitis B Core Antigen and Their Immunological Properties

Bio/Technology volume 8, pages 644649 (1990) | Download Citation

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Abstract

Hepatitis B core protein (HBcAg) is a potent antigen that gives both a T-cell dependent and a T-cell-independent antibody response. It has been shown that a foreign epitope can be fused to the amino terminus of HBcAg without affecting partide integrity, and that the resulting chimaeric cores retain the immunogenicity of the foreign epitope. Here we describe the efficient expression in yeast of two different chimaeric cores, carrying epitopes of Foot and Mouth Disease Virus (FMDV) or human chorionic gonadotrophin (hCG), which are candidates for FMD and contraceptive vaccines, respectively. These cores could not be produced in E. coli in soluble form but were expressed to high levels in yeast. We constructed a yeast expression vector that allows rapid production of different chimaeric cores by cloning in cassettes encoding foreign epitopes. Both FMDV and hCG-cores were shown to present the epitopes at the sur face of the particles. The FMDV-cores produced in yeast were efficient inducers of neutralising antibodies in guinea-pigs after one low dose.

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Author information

Author notes

    • M.A. Romanos

    Corresponding author.

Affiliations

  1. Wellcome Research Laboratories, Langley Court, Beckenham, Kent BR3 3BS.

    • K.M. Beesley
    • , J.J. Clare
    • , F. Brown
    •  & M.A. Romanos
  2. Department of Molecular Biology and Virology, Langley Court, Beckenham, Kent BR3 3BS.

    • M.J. Francis
    •  & B.E. Clarke
  3. Wellcome Biotech, and Microscopy Unit, (Pharmacology), Langley Court, Beckenham, Kent BR3 3BS.

    • J.E. Beesley
    •  & P.J.C. Dopping-Hepenstal

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DOI

https://doi.org/10.1038/nbt0790-644

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