Polypeptides having binding affinity for her2

C - Chemistry – Metallurgy – 07 – K

Patent

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C07K 14/31 (2006.01) A61P 35/00 (2006.01)

Patent

CA 2531238

A polypeptide is provided, which has a binding affinity for HER2 and which is related to a domain of staphylococcal protein A (SPA) in that the sequence of the polypeptide corresponds to the sequence of the SPA domain having from 1 to about 20 substitution mutations. Nucleic acid encoding the polypeptide, as well as expression vector and host cell for expressing the nucleic acid, are also provided. Also provided is the use of such a polypeptide as a medicament, and as a targeting agent for directing substances conjugated thereto to cells overexpressing HER2. Methods, and kits for performing the methods, are also provided, which methods and kits rely on the binding of the polypeptide to HER2.

La présente invention a trait à un polypeptide présentant une affinité de liaison pour le récepteur 2 du facteur de croissance épidermique humain (HER2) et associé à un domaine de la protéine A de Staphylococcus (SPA) caractérisé en ce que cette séquence du polypeptide correspond à la séquence du domaine de la protéine A de Staphylococcus ayant 1 à 20 mutations de substitution. L'invention a également trait à un acide nucléique codant pour le polypeptide, ainsi qu'à un vecteur d'expression et une cellule hôte pour l'expression de l'acide nucléique. L'invention a trait en outre à l'utilisation d'un tel polypeptide en tant que médicament, et à un agent de ciblage pour diriger des substances conjuguées à celui-ci à des cellules surexprimant le HER2. Enfin, l'invention a trait à des procédés, et des trousses pour la réalisation des procédés, lesquels procédés et trousses reposent sur la liaison du polypeptide au HER2.

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