Peptide substrates recognisable by a botulinum toxin a,...

C - Chemistry – Metallurgy – 12 – Q

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C12Q 1/37 (2006.01) C07K 7/08 (2006.01) C07K 14/00 (2006.01) G01N 21/64 (2006.01)

Patent

CA 2565678

The invention relates to a peptide substrate selectively recognisable by a botulinum toxin A, BoNT/A comprising a Nop-(Z)-Pya fragment in the peptide structure thereof, wherein Z is an aminoacid chain, preferably RA and said fragment is cleaved by the toxin. Said invention also relates to the substrate use, in particular for carrying out methods for detecting, identifying and/or dosing the botulinum toxin A at very low concentrations (of order of 20 pg) or the inhibitors and/or activators of the toxin metallopeptidase activity, thereby making it possible to quantify the power thereof.

La présente invention a pour objet un substrat peptidique reconnu sélectivement par la toxine botulique de type A, BoNT/A, caractérisée en ce qu'il comprend dans sa. structure peptidique un fragment Nop-(Z)-Pya dans lequel Z représente un enchaînement d'aminoacides, préférentiellement RA, le dit fragment étant clivé par la dite toxine. L'invention concerne également les utilisations de ce substrat, notamment dans le cadre de la mise en oeuvre de procédés pour détecter, identifier et/ou doser la toxine botulique de type A à des concentrations très faibles (de l'ordre de 20 pg), ou des inhibiteurs et/ou activateurs de l'activité métallopeptidasique de ladite toxine, et dans ce dernier cas quantifier leur puissance.

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