Pegylated mutated clostridium botulinum toxin

C - Chemistry – Metallurgy – 07 – K

Patent

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Details

C07K 14/33 (2006.01) A61K 38/16 (2006.01)

Patent

CA 2638862

The invention relates to a modified botulinum toxin which has a naturally occurring heavy chain and a modified light chain. The invention is characterized in that the modification of the light chain is that it comprises (i) on its N terminus an extension of the chain which has the structure -(C)n- (tag)m-(X)l- in the direction from the N terminus to the C terminus, C representing a cysteine group, tag representing any tag and X representing a group of any naturally occurring amino acid, n being an integer from 1 to 50, m being 0 or 1 and l being 0 or an integer from 1 to 50, and (ii) that at least one of the cystein groups in the extension of the chain is coupled to at least one chain PEG.

La présente invention concerne une toxine botulique modifiée présentant une chaîne lourde naturelle et une chaîne légère modifiée. L'invention se caractérise en ce que la modification de la chaîne légère consiste (i) en un allongement de la chaîne au niveau de sa terminaison N qui présente la structure -(C)n-(tag)m-(X)l- de l'extrémité N-terminale à l'extrémité C-terminale, C désignant un résidu cystéine, tag désignant une étiquette quelconque et X le résidu d'un acide aminé quelconque d'origine naturelle, n étant un nombre entier de 1 à 50, m = 0 ou 1 et l = 0 ou un nombre entier de 1 à 50. Cette invention se caractérise également (ii) en ce qu'au moins un des résidus cystéine dans l'allongement de la chaîne est couplé à au moins une chaîne PEG.

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