Streptavidin mutants

C - Chemistry – Metallurgy – 12 – N

Patent

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Details

C12N 15/31 (2006.01) C07K 1/22 (2006.01) C07K 14/36 (2006.01) C12Q 1/68 (2006.01) G01N 33/53 (2006.01) A61K 38/00 (2006.01)

Patent

CA 2222035

The present invention relates to streptavidin proteins and peptides having altered physical properties such as an increased stability or increased or decreased affinity for binding biotin. The invention also relates to methods for the detection, identification, separation and isolation of targets using streptavidin proteins or peptides. Streptavidin with increased or reduced affinity allows for the use of the streptavidin-biotin coupling systems for detection and isolation systems wherein it is necessary to remove one or the other of the binding partners. Such systems are useful for the purification of functional proteins and viable cells. The invention also relates to nucleic acids which encode these streptavidin proteins and peptides and to recombinant cells such as bacteria, yeast and mammalian cells which contain these nucleic acids.

Cette invention porte sur des protéines et des peptides de streptavidine présentant des propriétés physiques modifiées, par exemple, dans le sens d'un stabilité accrue ou d'une affinité accrue ou amoindrie pour fixer la biotine. Cette invention concerne également des procédés de détection, d'identification, de séparation et d'isolation de cibles à l'aide de protéines ou de peptides de streptavidine. La streptavidine pourvue d'une affinité accrue ou amoindrie permet l'utilisation de systèmes de couplage streptavidine-biotine pour la détection et l'isolation de systèmes dans lesquels il est nécessaire de retirer l'un ou l'autre des partenaires de liaison. Ces systèmes se révèlent utiles pour la purification de protéines fonctionnelles et de cellules viables. L'invention porte, en outre, sur des acides nucléiques codant ces protéines et peptides de streptavidine ainsi que sur des cellules de recombinaison telles que des bactéries, de la levure de bière et des cellules mammaliennes contenant ces acides nucléiques.

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