Ribonuclease zymogen design

C - Chemistry – Metallurgy – 12 – N

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C12N 9/00 (2006.01) C12N 9/22 (2006.01)

Patent

CA 2489446

An enzyme is re-engineered to be a zymogen, an enzyme precursor which is converted into an enzyme by protease cleavage. In the example described here, an RNase A enzyme is converted into a zymogen by adding to the enzyme a bridge of amino acids linking the amino and carboxyl termini of the enzyme. The bridge has built in it a protease cleavage site for a specific protease, for example the protease plasmepsin II, produced by the malaria parasite. Since RNase A can be made cytotoxic, this permits a cytotoxic enzyme to be made in the form of a zymogen that becomes active only when it is acted on by a protease only present in a particular target cell such as a pathogen.

Une enzyme est re-manipulée pour devenir une proenzyme, précurseur d'enzyme qui est transformé en une enzyme par clivage de la protéase. Dans l'exemple spécifié, une enzyme Rnase A est transformée en une proenzyme en ajoutant à l'enzyme un pont d'aminoacides liant l'amino et les terminaisons carboxyle de l'enzyme. Le pont a ainsi édifié dans l'enzyme un site de clivage de protéase pour une protéase spécifique, par exemple, la protéase plasmepsine II produite par le parasite du paludisme. Du fait que la Rnase A peut être cytotoxique, ceci permet de former une enzyme cytotoxique sous la forme d'une proenzyme qui ne devient active que si elle est influencée par une protéase uniquement présente dans une cellule cible particulière, telle qu'une pathogène.

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