Method for screening for substances which are activators,...

C - Chemistry – Metallurgy – 12 – Q

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C12Q 1/48 (2006.01) C07K 7/06 (2006.01)

Patent

CA 2351166

The invention relates to a method for screening for substances which are activators or inhibitors of Protein kinase B (PKB) and can be used as a kinase substrate for PKB. The substrate is a peptide comprising the two sequences R-R- R-A-A/V-S-M and R-P/S-R-S/T-S/N-S-N and preferably comprising the three sequences R-P-R-S-C-T-W, R-R-R-A-A/V-S-M and R-P/S-R-S/T-S/N-S-N. These sequences as well as the human Afx, amino acids 12-505 or amino acids 1-505, can be used in assays measuring the activity of PKB, and in screening for substances which are activators or inhibitors of gene transcriptional regulation of forkhead proteins through the catalytic activities of PKB. These sequences can also be used for discrimination between the effects of compounds which mediate insulin action through transcription from those which modulate activity of enzymes involved in metabolism by phosphorylation.

L'invention concerne un procédé permettant de sélectionner des substances qui sont des activateurs ou des inhibiteurs de la protéine kinase B (PKB) et peuvent être utilisés en tant que substrat de la kinase pour la PKB. Ce substrat est un peptide comprenant les deux séquences R-R-R-A-A/V-S-M et R-P/S-R-S/T-S/N-S-N, et de préférence les trois séquences suivantes: R-P-R-S-C-T-W, R-R-R-A-A/V-S-M et R-P/S-R-S/T-S/N-S-N. Ces séquences ainsi que l'Afx humain, les acides aminés 12-505 ou les acides aminés 1-505, peuvent être utilisés dans des processus permettant de mesurer l'activité de la PKB, et de sélectionner des substances qui sont des activateurs ou des inhibiteurs de la régulation transcriptionnelle des protéines à tête de fourche, résultant des activités catalytiques de la PKB. Ces séquences peuvent également être utilisées pour établir une distinction entre les effets des composés qui sont des médiateurs de l'activité insulinique par voie de transcription, et ceux qui modulent l'activité des enzymes intervenant dans le métabolisme par phosphorylation.

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