An active hedgehog-protein-mutant, a process for its...

C - Chemistry – Metallurgy – 12 – N

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C12N 15/12 (2006.01) A61K 38/17 (2006.01) C07K 14/46 (2006.01) C12N 5/10 (2006.01) C12N 15/86 (2006.01) A61K 38/00 (2006.01)

Patent

CA 2312009

A post-translationally processed hedgehog protein mutant which exhibits a molecular weight of 22 ~ 2 kDa under alkylating conditions, exhibits a molecular weight of 24 ~ 2 kD under reducing conditions, is stabilized with respect to its activity by suramin, is inactivated when 8 or more amino acids are cleaved N-terminally, is inactivated by 90 % or more when incubated with 10 mmol/1 DTE for 2.5 hours at 37 ~C, induces an activity for alkaline phosphatase of ca. 90 nmol pNP/min/mg at a concentration of 5 nmol/1 in the presence of suramin, is not modified by cholesterol and has an at least 50- fold activity compared to the recombinant hh protein isolated from the cytoplasm of E. coli, exhibits an activity that is increased many times.

L'invention porte sur un mutant de protéine du hérisson traité de façon post-translationnelle. Ce mutant présente un poids moléculaire de 22 ± 2 kDa dans des conditions d'alkylation, et de 24 ± 2 kD dans des conditions de réduction. Il est stabilisé par rapport à son activité par la suramine; il est inactivé lorsqu'au moins 8 acides aminés sont clivés en N-terminal, et est inactivé d'au moins 90 % lorsqu'il est incubé avec DTE 10 mmol/l pendant 2 heures et demi à 37 ·C; il induit une activité pour l'alcaline phosphatase d'environ 90 nmol pNP/mn/mg dans une concentration de 5 nmol/l en présence de la suramine; il n'est pas modifié par le cholestérol et présente une activité au moins 50 supérieure à celle de la protéine hh recombinée, isolée du cytoplasme d'E. coli. L'activité de ce mutant est largement augmentée.

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