Improved chimeric toxins

C - Chemistry – Metallurgy – 12 – N

Patent

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Details

C12N 15/62 (2006.01) A61K 47/48 (2006.01) C07K 14/34 (2006.01) C07K 14/485 (2006.01) C07K 14/54 (2006.01) C07K 14/55 (2006.01) C07K 19/00 (2006.01) C12N 9/10 (2006.01) C12N 15/18 (2006.01) C12N 15/26 (2006.01) C12N 15/31 (2006.01) C12N 15/54 (2006.01) A61K 38/00 (2006.01)

Patent

CA 2076678

A chimeric toxin comprising protein fragments joined together by peptide bonds, the chimeric toxin comprising, in sequential order, beginning at the amino terminal end of the chimeric toxin, (a) the enzymatically active Fragment A of diphtheria toxin, (b) a first fragment including the cleavage domain 1 1 adjacent the Fragment A of diphtheria toxin, (c) a second fragment comprising at least a portion of the hydrophobic transmembrane region of Fragment B of diphtheria toxin, the second fragment having a deletion of at least 50 diphtheria toxin amino acid residues, the deletion being C-terminal to the portion of the transmembrane region, and the second fragment not including domain 12, and (d) a third fragment comprising a portion of a cell-specific polypeptide ligand, the portion including at least a portion of the binding domain of the polypeptide ligand, the portion of the binding domain being effective to cause the chimeric toxin to bind selectively to a predetermined class of cells to be attacked by the enzymatically active Fragment A.

Toxine chimérique comprenant des fragments protéiques reliés par des liaisons peptides comportant, dans un ordre séquentiel commençant à l'extrémité amino de la toxine chimérique, (a) le Fragment A enzymatiquement actif de la toxine de la diphtérie, (b) un premier fragment englobant le domaine de clivage 11 adjacent au Fragment A de la toxine de la diphtérie, (c) un deuxième fragment comprenant au moins une portion de la région transmembraneuse hydrophobe du Fragment B de la toxine de la diphtérie, le deuxième fragment ayant une délétion d'au moins 50 résidus aminoacides de toxine de la diphtérie, la délétion allant de l'extrémité C à la portion de la région transmembraneuse, et le deuxième fragment n'englobant pas le domaine 12, et (d) un troisième fragment comprenant une portion d'un ligand polypeptidique spécifique de la cellule, cette portion englobant au moins une portion du domaine liant du ligand polypeptidique, la portion du domaine liant étant efficace pour que la toxine chimérique se lie sélectivement à une classe de cellules prédéterminée devant être attaquée par le Fragment A enzymatiquement actif.

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