Improved fix-mutant proteins for hemophilia b treatment

C - Chemistry – Metallurgy – 12 – N

Patent

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C12N 9/64 (2006.01)

Patent

CA 2674879

The present invention relates to recombinant blood coagulation factor IX (rFIX) mutants having improved FIX clotting activity. Three full length FIX proteins with combinations of mutations of amino acids important for functional activity of FIX and FIX wild type were cloned and expressed in HEK 293 cells. The proteins were tested by an activated partial thromboplastin time (aPTT) assays in FIX-depleted plasma. Two mutant proteins had increased specific FIX activity. Furthermore, a pre-activated FIX protein had an increased activity in FIX-depleted plasma. Therefore these FIX mutants can be used for the treatment of FIX associated bleeding disorders.

L'invention concerne des mutants recombinés du facteur IX (rFIX) de la coagulation sanguine, présentant une activité accrue de coagulation FIX. Trois protéines FIX pleine longueur présentant des combinaisons de mutations ou d'acides aminés importantes pour une activité fonctionnelle de FIX et de FIX de type sauvage sont clonées et exprimées dans des cellules HEK 293. Ces protéines sont testées par des bioanalyses de temps de thromboplastine partielle activée (TTPa) dans un plasma dépourvu de FIX. Deux protéines mutantes présentent une activité FIX spécifique. En outre, une protéine FIX pré-activée présente une activité accrue dans un plasma dépourvu de FIX. Par conséquent, ces mutants FIX peuvent être utilisés pour traiter des troubles de saignement associés à FIX.

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