Fusion proteins comprising cell cycle regulatory proteins

C - Chemistry – Metallurgy – 12 – N

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Details

C12N 9/96 (2006.01) C07K 14/47 (2006.01) C12N 9/12 (2006.01)

Patent

CA 2241849

The present invention provides novel fusion proteins comprising cyclins and CDKs. A preferred embodiment of the invention provides fusion proteins comprising human cyclin D1 and human CDK4. The fusion proteins of the invention optionally contain modifications, which facilitate their purification. Addition of histidine residues to selected constructs allows purification via immobilized metal affinity chromatography. Antigenic determinants allowing monoclonal antibody-based affinity chromatography purification are provided in selected embodiments of the invention. Protease cleavage sites are incorporated in selected constructs to allow cleavage of the regions incorporated in the cyclin-CDK fusion proteins for purification. Additional modifications which facilitate purification include strepavadin binding domains and antigenic determinants for antibody affinity chromatography.

La présente invention concerne de nouvelles protéines de fusion comprenant des cyclines et des CDK. Une réalisation préférée de l'invention porte sur des protéines de fusion comprenant de la cycline D1 humaine et de la CDK4 humaine. Les protéines de l'invention présentent facultativement des modifications qui en facilitent la purification. L'addition de restes histidine à des produits de recombinaison sélectionnés permet une purification par chromatographie d'affinité à métaux immobilisés. Certaines réalisations de l'invention concernent des déterminants antigéniques permettant la purification par chromatographie d'affinité aux anticorps monoclonaux. Des sites de clivage de protéase sont incorporés dans les produits de recombinaison sélectionnés pour permettre le clivage des régions incorporées dans les protéines de fusion cycline-CDK destinées à la purification. Des modifications supplémentaires facilitant la purification concernent des domaines de liaison de la strépavadine et des déterminants antigéniques destinés à la chromatographie d'affinité aux anticorps.

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