Streptavidin having low immunogenicity and use thereof

C - Chemistry – Metallurgy – 12 – N

Patent

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Details

C12N 15/09 (2006.01) A61K 31/4188 (2006.01) A61K 38/00 (2006.01) A61K 39/395 (2006.01) A61P 37/06 (2006.01) C07K 14/195 (2006.01) C07K 16/00 (2006.01) C07K 19/00 (2006.01) G01N 33/53 (2006.01)

Patent

CA 2753048

It is an object of the present invention to provide a mutant streptavidin wherein the immunogenicity (antigenicity) in mammals of a streptavidin is reduced. The present invention provides a mutant streptavidin, which comprises an amino acid sequence in which (a) the arginine residue at position 72 is substituted with another amino acid residue, and (b) any one or more of the tyrosine residue at position 10, the tyrosine residue at position 71, the glutamic acid residue at position 89, the arginine residue at position 91, and the glutamic acid residue at position 104 are substituted with other amino acid residues, with respect to the amino acid sequence of a core streptavidin as shown in SEQ ID NO: 2, and which has decreased immunogenicity as compared with that of a wild-type streptavidin.

L'invention porte sur un mutant de la streptavidine dans lequel l'immunogénicité (l'antigénicité) de la streptavidine chez des mammifères a été réduite. La séquence d'acides aminés de base de la streptavidine du mutant de la streptavidine, décrite par la séquence n°2, contient une séquence d'acides aminés dans laquelle (a) l'arginine au niveau du résidu d'acide aminé 72 est remplacée par un autre acide aminé et (b) un ou plusieurs acides aminés quelconques parmi la tyrosine au niveau du résidu d'acide aminé 10, la tyrosine au niveau du résidu d'acide aminé 71, l'acide glutamique au niveau du résidu d'acide aminé 89, l'arginine au niveau du résidu d'acide aminé 91 et l'acide glutamique au niveau du résidu d'acide aminé 104 sont remplacés par un autre acide aminé, ce qui réduit de cette manière l'immunogénicité par comparaison avec la streptavidine de type sauvage.

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