Determination of the Minimal Length of PreS1 Epitope Recognized by a Monoclonal Antibody Which Inhibits Attachment of Hepatitis B Virus to Hepatocytes

Overview

Journal Med Microbiol Immunol

Specialty Allergy & Immunology

Date 1992 Jan 1

PMID 1279369

Citations 14

Authors

I Sominskaya

P Pushko

D Dreilina

T Kozlovskaya

P Pumpen

Affiliations

Soon will be listed here.

Abstract

The minimal amino acid sequence sufficient to be recognized efficiently by virus-attachment inhibiting murine monoclonal anti-preS1 antibody MA18/7 has been determined. We have constructed a recombinant gene library using the cloned coat protein gene of Escherichia coli RNA bacteriophage fr as a carrier. Different fragments of preS1 region from cloned hepatitis B virus (HBV) genomes, subtype ayw and adw, were inserted at position 2 of the 129 amino acid-long fr coat protein gene in the appropriate E. coli expression vectors. Fine mapping of preS1 epitope recognized by MA18/7 was accomplished by bidirectional shortening of the preS1 within original recombinant preS-fr coat protein genes with Bal31 exonuclease. Immunoblot analysis of the obtained recombinant protein library revealed that the tetrapeptide Asp-Pro-Ala-Phe (DPAF), located at the position preS(31-34) and conserved in all known HBV genomes, is sufficient to bind MA18/7 antibody. Recognition of the preS1 region by MA18/7 occurred irrespective of the amino acid context surrounding this DPAF tetrapeptide. Further shortening of this minimal epitope from the left or from the right side completely prevented antibody binding in immunoblots.

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