Prion protein modulator factor (ppmf) and prion resistant...

A - Human Necessities – 61 – K

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A61K 38/00 (2006.01) A61K 31/417 (2006.01) A61K 31/4178 (2006.01) C07H 21/00 (2006.01) C07H 21/02 (2006.01) C07H 21/04 (2006.01) C07K 1/00 (2006.01) C07K 1/04 (2006.01) C07K 14/47 (2006.01)

Patent

CA 2287848

A protein designated Prion Protein Modulator Factor (PPMF) is disclosed which protein is an auxiliary factor in prion replication. PPMF is primarily characterized by its ability to bind to PrPC and facilitate a conformational change from PrPC to PrPSc. A discontinuous epitope on PrPC comprising residues 172, 215 and 219 of human PrPC binds PPMF which is encoded by a nucleotide sequence derived from an organism selected from the group consisting of cow, sheep, mouse, hamster and human. In converting PrPC to PrPSc the PPMF forms a PRPC/PrPSc complex and is a rate limiting compound in the formation of that complex. Molecules, including antibodies, which bind PPMF or its epitope on PrPC are useful in the treatment of prion disease. Pharmacophores of the PrPC epitope are disclosed as are useful therapeutics and pharmacophores of the PPMF surface which binds PrPC. Animals resistant to prion disease are taught as are genes for producing such animals. Assay systems are disclosed which use PPMF to amplify PrPSc in sample being tested.

On décrit une protéine appelée facteur de modulation de la protéine du prion (PPMF), qui est un facteur auxiliaire dans la réplication du prion. Le PPMF se caractérise principalement par sa capacité à se fixer à la PrP?C¿ et à faciliter un changement conformationnel de la PrP?C¿ en PrP?Sc¿. Un épitope fragmenté de PrP?C¿ comprenant des résidus (172, 215, 219) de la PrP?C¿ humaine se fixe au PPMF, lequel est codé par une séquence nucléotidique issue d'un organisme sélectionné dans le groupe constitué par une vache, un mouton, une souris, un hamster et un humain. En transformant la PrP?C¿ en PrP?Sc¿, le PPMF forme un complexe PrP?C¿/PrP?Sc¿ et constitue un composé cinétiquement limitant dans la formation dudit complexe. On décrit des molécules incluant des anticorps qui lient le PPMF ou son épitope à la PrP?C¿ et conviennent pour le traitement de maladies à prion. On décrit en outre des pharmacophores de l'épitope de la PrP?C¿ qui conviennent comme agents thérapeutiques, et des pharmacophores de la surface du PPMF qui se lient à la PrP?C¿. On décrit enfin des animaux résistants aux maladies à prion et des gènes pouvant produire de tels animaux, ainsi que des systèmes de dosage qui mettent en oeuvre le PPMF pour amplifier la PrP?Sc¿ dans un échantillon en cours de dosage.

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