Method for the production of fusion proteins in transgenic...

C - Chemistry – Metallurgy – 07 – K

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C07K 1/00 (2006.01) A01N 43/04 (2006.01) A61K 38/00 (2006.01) C07H 21/04 (2006.01) C12N 5/00 (2006.01) C12N 15/00 (2006.01) C12P 21/00 (2006.01)

Patent

CA 2537273

Desirable fusion proteins can be produced in and purified from the milk of transgenic animals. The peptides are made as fusion proteins with a suitable fusion partner such as human alpha-fetoprotein. The fusion partner protein acts to promote and increase the half-life of the overall molecule as well as having therapeutic effects on its own. The fusion protein is typically produced through the use of transgenic animals and can be purified away from the now the milk or other bodily fluid of such an animal by an affinity purification method. A particular advantage of producing peptides via this route, in addition to the obvious advantages of high yield and biocompatibility, is that specific post-translational modifications, such as carboxy terminal amidation, can be performed in the mammary gland. Biologically active polypeptides comprising a therapeutically active polypeptide fused to human alpha-fetoprotein fragment or a variant thereof, methods for the preparation thereof, nucleotide sequences encoding such fusion polypeptides, expression cassettes comprising such nucleotide sequences, self- replicating plasmids containing such expression cassettes, and pharmaceutical compositions containing said fusion polypeptides.

L'invention permet de produire des protéines de fusion recherchées dans le lait d'un animal transgénique et de les purifier. Les peptides sont transformés en protéines de fusion à l'aide d'un protéine partenaire de fusion adapté telle qu'une alpha-fétoproteine humaine. La protéine partenaire de fusion agit pour promouvoir et accroître la demi-vie de la globalité de la molécule tout en ayant un effet thérapeutique sur elle-même. La protéine de fusion est normalement produite en utilisant des animaux transgéniques et en l'extrayant de leur lait ou d'autres fluides corporels, puis en la purifiant par un procédé de purification par affinité. En plus de ses avantages évidents de fort rendement et de biocompatibilité, ce procédé de production de peptides présente celui d'effectuer à l'intérieur des glandes mammaires des modifications post-translationnelles spécifiques telles que l'amidation du terminal carboxy. L'invention porte en outre: sur des polypeptides biologiquement actifs à effet thérapeutique fusionnés avec des fragments d'alpha-fétoproteine humaine ou de ses analogues, et sur leurs procédés de préparation; sur des séquences nucléotidiques codant pour lesdits polypeptides de fusion; sur des cassettes d'expression comprenant lesdites séquences nucléotidiques; sur des plasmides auto-réplicants contenant lesdites cassettes d'expression; et sur des préparations pharmaceutiques contenant lesdits polypeptides de fusion.

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