Recombinant clostridial toxin fragments with proteolytic...

C - Chemistry – Metallurgy – 12 – N

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C12N 9/52 (2006.01)

Patent

CA 2498502

A single polypeptide is provided which comprises first and second domains. The first domain enables the polypeptide to cleave one or more vesicle or plasma- membrane associated proteins essential to exocytosis, and the second domain enables the polypeptide to be translocated into a target cell or increases the solubility of the polypeptide, or both. The polypeptide thus combines useful properties of a clostridial toxin, such as a botulinum or tetanus toxin, without the toxicity associated with the natural molecule. The polypeptide can also contain a third domain that targets it to a specific cell, rendering the polypeptide useful in inhibition of exocytosis in target cells. Fusion proteins comprising the polypeptide, nucleic acids encoding the polypeptide and methods of making the polypeptide are also provided. Controlled activation of the polypeptide, is possible and the polypeptide can be incorporated into vaccines and toxin assays.

Cette invention se rapporte à un polypeptide unique qui comprend un premier et un second domaine. Le premier domaine permet au polypeptide de cliver une ou plusieurs protéines associées à des vésicules ou à des membranes de plasma, essentielles pour l'exocytose, et le second domaine permet la translocation du polypeptide dans une cellule cible et/ou augmente la solubilité du polypeptide. Ce polypeptide combine ainsi les propriétés d'une toxine clostridiale, par exemple d'une toxine botulinique ou tétanique, sans la toxicité associée à la molécule naturelle. Ce polypeptide peut également contenir un troisième domaine qui le cible sur une cellule spécifique, le rendant ainsi utile pour inhiber l'exocytose dans des cellules cibles. Des protéines de fusion comprenant ce polypeptide, des acides nucléiques codant ce polypeptide et des procédés pour fabriquer ce polypeptide sont également décrits. L'activation régulée de ce polypeptide est possible et ce polypeptide peut être incorporé dans des vaccins et des dosages de toxines.

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