Nucleotidic sequence coding the surface antigen of the hepatitis B virus, vector containing said nucleotidic sequence, process allowing the obtention thereof and antigen obtained thereby

Abstract

Nucleic acid of reduced size and vector containing said nucleotidic sequence of which DNA codes an immunogenic peptidic sequence capable of inducing the generation of antibodies to the virus of viral hepatitis B. It comprises totally or partly the sequence of nucleotides represented in FIG. 3A. Application to the production by cloning in a bacterium of an immunogenic protein immunizing against hepatitis B, or application to the obtention of probes for the diagnosis of the presence of Dane particles in a serum.

We claim: .[. 
     
       1.  A peptide which comprises the sequence: Alanine-Glutamine-Glycine-Threonine-Serine, wherein the alanine end is N-terminal and the serine end is C-terminal..]. .[. 
     
     
       2.  A peptide which comprises the sequence: Threonine-Alanine-Glutamine-Glycine-Threonine-Serine, wherein the threonine end is N-terminal and the serine end is C-terminal..]. .[.3. A peptide which comprises the sequence: Threonine-Threonine-Alanine-Glutamine-Glycine-Threonine-Serine, wherein the threonine end is N-terminal and the serine end is C-terminal..]. .[.4. A peptide which comprises the amino acid sequence of FIG. 5 starting with serine (number 113) and ending with tryptophan (number 165)..]. .[.5. The peptide of claim 4 which comprises within the peptide the amino acid sequence: Alanine-Glutamine-Glycine-Threonine-Serine..]. .[.6. The peptide of claim 3 which comprises within the peptide the amino acid sequence:   Threonine-Alanine-Glutamine-Glycine-Threonine-Serine..]. .[.7. The peptide of claim 4 which comprises within the peptide the amino acid sequence:   Threonine-Threonine-Alanine-Glutamine-Glycine-Threonine-Serine..]. .[.8. An immunogenic peptide sequence which comprises the amino acids shown in FIGS. 3A, 3B, and 3C numbering not less than 5 amino acids and not more than 226 amino acids which peptide induces in vivo the production of active antibodies with respect to the hepatitis B virus..]. .[.9. The immunogenic peptide sequence which comprises the amino acids shown in FIG. 6 numbering not less than 5 amino acids and not more than 53 amino acids, which peptide induces in vivo the production of active antibodies with respect to the hepatitis B virus..]. .[.10. A pharmaceutical composition comprising an effective amount of the peptides of claims 1, 2, 3, 4, 5, 6 or 7, wherein composition includes in vivo production of antibodies, the hepatitis B-virus, and a pharmaceutically acceptable carrier..]. .Iadd.11. A portion of surface antigen protein of hepatitis B virus, wherein said portion consists essentially of a polypeptide having the sequence:   Alanine-Glutamine-Glycine-Threonine-Serine. .Iaddend. .Iadd.12. A portion of surface antigen protein of hepatitis B virus, wherein said portion consists essentially of a polypeptide having the sequence:   Threonine-Alanine-Glutamine-Glycine-Threonine-Serine. .Iaddend. .Iadd.13. A portion of surface antigen protein of hepatitis B virus, wherein said portion consists essentially of a polypeptide having the sequence:   Threonine-Threonine-Alanine-Glutamine-Glycine-Threonine-Serine. .Iaddend.