Recombinant protein expression

C - Chemistry – Metallurgy – 12 – P

Patent

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C12P 21/00 (2006.01) A61K 38/16 (2006.01) A61K 48/00 (2006.01) C12N 15/63 (2006.01) C12N 15/67 (2006.01) C12P 21/02 (2006.01)

Patent

CA 2471178

There are provided methods for the expression of a recombinant protein of interest, said methods comprising, in additional to various additional steps: a) culturing a host cell which expresses: i) one or more genes encoding the recombinant protein(s) of interest; ii) at least two genes encoding proteins selected from the group consisting of the chaperone proteins GroEL, GRoES, Dnak, DnaJ, GRpe, ClpB and their homologs (for example, Hsp104, Ydj1 and Ssal in yeast); under conditions suitable for protein expression; and separating said recombinant protein of interest from the host cell culture. Also provided are methods for increasing the degree of refolding of a recombinant protein of interest by ading a composition containing a chaperone protein to a preparation of the recombinant protein of interest in vitro.

L'invention concerne des procédés d'expression d'une protéine de recombinaison d'intérêt. Ces procédés consistent, outre plusieurs étapes supplémentaires : a) à cultiver une cellule hôte qui exprime : i) un ou plusieurs gènes codant la/les protéine(s) de recombinaison d'intérêt ; ii) au moins deux gènes codant les protéines choisies dans le groupe consistant en des protéines chaperonnes GroEL, GroES, DnaK, DnaJ, GrpE, ClpB et leurs homologues (par exemple, Hsp104, Ydj1, et Ssal dans la levure) ; dans des conditions convenant à l'expression de la protéine ; et b) à séparer ladite protéine de recombinaison d'intérêt de la culture de cellule hôte. L'invention concerne aussi des procédés d'augmentation du degré de repli d'une protéine de recombinaison d'intérêt par addition d'une composition contenant une protéine chaperonne dans une préparation de la protéine de recombinaison d'intérêt in vitro.

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