Expression-enhanced polypeptides

C - Chemistry – Metallurgy – 07 – K

Patent

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C07K 16/00 (2006.01) C07K 16/46 (2006.01) C12N 15/67 (2006.01)

Patent

CA 2570990

A composite polypeptide, said composite polypeptide comprising a desired polypeptide and an expression enhancing domain ("EED"), said EED comprising first and second cysteine amino acid residues Cys1 and Cys2, respectively, Cys1 being located closer to the N-terminus of the composite polypeptide molecule than Cys2, wherein Cys1 and Cys2 are separated by a polypeptide linker, said linker - being free of cysteine and proline; - defining a length sufficient to allow Cys1 and Cys2 to engage in an intramolecular disulfide bond with one another; and - having a flexible polypeptide conformation essentially free of secondary polypeptide structure in aqueous solution, wherein at least one of Cys1 and Cys2 is derivatized with a derivatization moiety.

L'invention concerne un polypeptide composite, ledit polypeptide composite comprenant un polypeptide désiré et un domaine d'amélioration d'expression ("EED"), ledit EED comprenant un premier et un deuxième résidus d'acides aminés de cystéine Cys1 et Cys2, respectivement, Cys1 étant situé plus près de l'extrémité N de la molécule de polypeptide composite que Cys2, Cys1 et Cys2 étant séparés par un lieur de polypeptide, ledit lieur; - étant exempt de cystéine et de proline; - définissant une longueur suffisante pour permettre à Cys1 et Cys2 d'entrer dans une liaison de disulfure; - et possédant une conformation de polypeptide souple sensiblement exempte de structure de polypeptide secondaire dans une solution aqueuse, au moins Cys1 ou Cys2 étant dérivatisé avec un groupe fonctionnel dérivatisé.

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