Novel osp-c derived peptide fragments

C - Chemistry – Metallurgy – 07 – K

Patent

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Details

C07K 14/20 (2006.01) A61K 39/02 (2006.01) C07K 7/06 (2006.01) G01N 33/569 (2006.01) A61K 39/00 (2006.01)

Patent

CA 2253374

A diagnostic method is disclosed which utilises short C-terminal fragments of Borrelia burgdorferi sensu lato derived protein OspC. The 4 amino-terminal amino acids Pro-Lys-Lys-Pro (SEQ ID NO: 22) are shown to be essential in immune reactivity between sera from patients suffering from early borreliosis and various OspC derivatives and it is shown that in order to be effective as a diagnostic agent, 5 consecutive amino acid residues must be present. Therefore, an immuno-logical agent used according to the invention comprises an at least amino acid residues long homologue of a fragment identical to the 10 C- terminal amino acids of OspC (SEQ ID NO: 1). Also disclosed are vaccines utilising the short peptides as well as methods for their preparation.

L'invention porte sur une méthode diagnostique faisant intervenir de courts fragments carboxy terminal de la protéine OspC issue de <u>Borrelia burgdorferi</u>, lato sensu. Les quatre acides aminés Pro-Lys-Lys-Pro (SEQ ID N DEG 22) à extrémité N-terminale se sont révélés comme étant un facteur décisif d'une réactivité immunitaire entre sérums de patients atteints de borréliose et différents dérivés de cette protéine OspC. Il a également été démontré que, pour être efficaces en tant qu'agent diagnostique, cinq groupes consécutifs aminoacides devaient être présents. Par conséquent, un agent immunologique utilisé au titre de l'invention comporte au moins un homologue long de cinq restes d'acides aminés d'un fragment identique aux dix acides aminés carboxy terminal de la protéine OspC (SEQ ID N DEG 1). Cette invention porte également sur des vaccins utilisant les peptides courts ainsi que sur des techniques permettant de les préparer.

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