Peptides comprising an immunogenic site of poliovirus and DNAS c

Chemistry: natural resins or derivatives; peptides or proteins; – Proteins – i.e. – more than 100 amino acid residues

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530324, 530327, C07K 710, C07K 708

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active

046940723

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

The invention relates to peptides comprising an immunogenic site of poliovirus and DNA fragments containing nucleotide sequences coding for these peptides. The invention also relates to vaccinating principles bringing such peptides into play, these principles being adapted to induce in the host, man or animal, the production of antibodies active not only against themselves, but also against complete infectious polioviruses.
In French Patent Application No. 82 02013 filed 8 Feb. 1982 there have already been described DNA fragments coding for an immunogenic peptide capable of inducing in vivo the synthesis of antipoliovirus antibodies. These DNA fragments possess a length not exceeding that of a DNA fragment comprising of the order of 1.2 kb (kilo-pairs of bases). These fragments are more particularly characterized in that they contain an nucleotide sequence coding for the protein VP-1, which has been found to bear essential antigenic determinants brought into play at the level of the immunogenicity of the corresponding infectious poliovirus. In fact, this peptide is capable of forming antigen-antibody complexes with monoclonal or polyclonal neutralizing serums obtained from animals in which whole poliovirus had been injectd (serum of D-specificity).
DNA type sequences coding for immunogenic peptides of the above-indicated type are illustrated in the succession of the appended FIGS. 1 and 2, for one of them, and in the succession of FIGS. 3 and 4, also appended, for another DNA fragment containing the abovesaid sequence. The locations of certain restriction sites to which reference will be made below are also indicated in these drawings The numbering of the successive nucleotides taking part in the constitution of these DNAs is effected from the 5' end. With respect to the constitution of the clonable DNA of the poliovirus from which the abovesaid DNAs have been obtained, reference will be made to the article of Sylvie VAN DER WERF and other authors, entitled "Molecular Cloning of the Genome of Poliovirus" in Proc. Nat. Acad. Sci. USA, Vol. 78, No. 10, pp. 59-83, 59-87, October 1981.
The invention arises from the discovery that peptides corresponding to the DNA sequences contained in the preceding ones, but much smaller than the latter, carried nonetheless antigenic determinants enabling their use in the constitution of vaccinating principles effective against the corresponding polioviruses. From the peptides concerned, some can be isolated the size of which is sufficiently small for them to be directly accessible by chemical synthesis.
The invention provides in addition technique enabling the determination, within DNAs of relatively large size which form the subject of French Patent Application No. 82 02013, of those of the smaller DNA sequences to which correspond peptides having determinants or antigenic sites making them suitable for use in the production of vaccinating principles against corresponding whole and infectious polioviruses.
In this regard, the longest of the DNA sequences according to the invention is constituted by the fragment bounded at its opposite end by XbaI sites located in the regions defined by the positions 2546 and 2861 of FIG. 1.
The invention relates more particularly still to those of the DNA sequences contained within the preceeding one and which code a peptide capable of being recognized by monoclonal antibodies active both against "C" and "D" particles originating from a same poliovirus and against the structural polypeptide VP-1 of the capsid of the same poliovirus. It is this type of monoclonal antibody which is concerned in all circumstances in the description which follows, except when it is otherwise specified.
Such antibodies are obtained from hybridoma which have been obtained by the carrying out of the fusion of spleen cells of an animal previously immunized by a virus or virion having a "C" antigenicity (obtained by thermal treatment for 1 hour at 56.degree. C. of the corresponding infectious poliovirus having "D" antigenicity) and suita

REFERENCES:
patent: 4508708 (1985-04-01), Van Wezel
patent: 4554101 (1985-11-01), Hopp
patent: 4591552 (1986-05-01), Neurath
The EMBO Journal, vol. 2, No. 11, pp. 2019-2024 (1983).
Journal of Virology (1986), 81-90, vol. 57, No. 1.
Virology, vol. 143, 337-341, (1985).
Proc. Natl. Acad. Sci., vol. 80, (1983), pp. 5080-5084.

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