Fused protein

C - Chemistry – Metallurgy – 12 – N

Patent

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Details

C12N 15/09 (2006.01) C07K 14/505 (2006.01) C07K 19/00 (2006.01) C12N 5/10 (2006.01) C12N 15/62 (2006.01) C12P 21/02 (2006.01)

Patent

CA 2328490

A fused protein containing a target protein which consists of, in the direction from the N-end toward the C-end, a) a signal sequence; b) an immunoglobulin Fc region with the deletion of at least CH1 domain; c) a peptide linker containing at the C-end an enzyme cleavage site allowing cleavage with enterokinase, etc.; and d) the amino acid sequence of the target protein such as erythropoietin, characterized in that, after the completion of the enzymatic cleavage, the target protein contains at the N-end no amino acid residue originating in the peptide linker. Thus, a target protein free from any amino acid-modification at the N-end can be efficiently produced by an enzymatic treatment.

Cette protéine fusionnée contient une protéine cible, constituée, dans le sens extrémité-N extrémité-C, (a), d'une séquence signal, (b), d'une région immunoglobuline Fc avec délétion du domaine CH1 au moins, (c), d'une séquence de liaison peptidique contenant, au niveau de l'extrémité-C, un site de clivage enzymatique permettant le clivage d'avec une entérokinase, etc. et, (d), la séquence aminoacide de la protéine cible telle qu'une erythropoïétine. Cette protéine se caractérise par le fait qu'une fois exécuté le clivage enzymatique, elle ne contient pas, au niveau de l'extrémité-N, de reste d'acide aminé provenant de la séquence de liaison peptidique. Il est ainsi possible de produire de manière satisfaisante, par traitement enzymatique, une protéine cible exempte de toute modification aminoacide au niveau de l'extrémité-N.

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