Composition, methods and reagents for the synthesis of a...

C - Chemistry – Metallurgy – 12 – N

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C12N 9/64 (2006.01) A61K 38/48 (2006.01) A61K 39/395 (2006.01) A61K 48/00 (2006.01) C07K 16/40 (2006.01) C12N 5/10 (2006.01) C12N 15/57 (2006.01) G01N 33/53 (2006.01) A61K 38/00 (2006.01)

Patent

CA 2365094

This invention relates to a soluble form of PHEX, PHEX being a type II integral membrane glycoprotein. This enzyme is the gene product of a phosphate-regulating gate with homologies to endopeptidases on the X chromosome. To produce a soluble forth of PHEX, the transmembrane anchor domain has been modified to encode a signal peptidase coding sequence. The soluble PHEX therefore comprises the active ectodomain. An inactive mutant of PHEX is also an object of this invention. Both soluble and inactive mutant forms of PHEX can be used to screen ligands to PHEX. These ligands can also be used as substrates or inhibitors of PHEX.PHEX being phosphaturic, an inhibitor thereof will be used to treat phosphaturia and/or hypophosphatemia. On the opposite, a substrate for PHEX or PHEX itself can be used to treat hyperphosphatemia.

L'invention concerne une forme soluble du PHEX (PHEX étant une glycoprotéine intrinsèque de type II). Cette enzyme est le produit génique d'un gène régulateur de phosphate présentant des homologies avec les endopeptidases sur le chromosome X. Pour produire une forme soluble de PHEX, on a modifié le domaine d'ancrage transmembranaire de sorte qu'il code une séquence de codage de peptidase signal. En conséquence, le PHEX soluble comprend l'ectodomaine actif. L'invention concerne en outre un mutant inactif du PHEX. Les formes mutantes soluble et inactive du PHEX peuvent être utilisées pour le criblage des ligands vis-à-vis du PHEX. On peut aussi utiliser les ligands en question comme substrats ou inhibiteurs du PHEX. Etant donné que le PHEX est phosphaturique, tout inhibiteur de PHEX sera utilisé pour le traitement de la phosphaturie et/ou de l'hypophosphatémie. Inversement, un substrat du PHEX ou le PHEX lui-même peuvent être utilisés pour le traitement de l'hyperphosphatémie.

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