Protease-activatable pseudomonas exotoxin a-like proproteins

C - Chemistry – Metallurgy – 12 – N

Patent

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Details

C12N 15/31 (2006.01) A61K 39/104 (2006.01) A61K 47/48 (2006.01) C07K 14/21 (2006.01) C07K 16/30 (2006.01) C07K 19/00 (2006.01) C12N 15/62 (2006.01) C12P 21/06 (2006.01) A61K 38/00 (2006.01)

Patent

CA 2271291

This invention provides protease-activatable Pseudomonas exotoxin A-like ("PE- like") proproteins. The proproteins comprise (1) a cell recognition domain of between 10 and 1500 amino acids that binds to a cell surface receptor; (2) a modified PE translocation domain comprising an amino acid sequence sufficiently homologous to domain II of PE to effect translocation to a cell cytosol upon proteolytic cleavage, wherein the translocation domain comprises a cysteine-cysteine loop that comprises a protease activatable sequence cleavable by a protease and wherein the cysteine-cysteine loop is substantially un-activatable by furin; (3) optionally, a PE Ib-like domain comprising an amino acid sequence up to 1500 amino acids; (4) a cytotoxicity domain comprising an amino acid sequence substantially homologous to domain III of PE, the cytotoxicity domain having ADP-ribosylating activity; and (5) an endoplasmic reticulum ("ER") retention sequence. The invention also provides methods of using these proproteins for killing target cells.

L'invention concerne des proprotéines similaires à l'exotoxine de pseudomonas (PE). Lesdites protéines comprennent (1) un domaine de reconnaissance cellulaire comprenant entre 10 et 1 500 acides aminés qui se lient à un récepteur de surface; (2) un domaine de translocation de PE comprenant une séquence d'acides aminés suffisamment homologue du domaine II de PE pour assurer la translocation dans un cytosol cellulaire lors d'un clivage protéolytique, le domaine de translocation comprenant une boucle cystéine-cystéine présentant une séquence activable par une protéase, pouvant être clivée par une protéase, la boucle cystéine-cystéine étant sensiblement non activable par la furine; (3) éventuellement, un domaine similaire à PE Ib, comprenant une séquence d'acides aminés ayant jusqu'à 1 500 acides aminés; (4) un domaine de cytotoxicité comprenant une séquences d'acides aminés sensiblement homologue du domaine II de PE, et ayant une activité d'ADP-ribosylation; et (5) une séquence de maintien du réticulum endoplasmique. L'invention porte aussi sur des procédés d'utilisation de ces proprotéines utilisés pour tuer des cellules cibles.

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