Methods for purifying protein

C - Chemistry – Metallurgy – 07 – K

Patent

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Details

C07K 19/00 (2006.01) C07K 1/14 (2006.01) C07K 1/16 (2006.01) C07K 1/22 (2006.01) C07K 14/705 (2006.01) C07K 14/715 (2006.01) C07K 16/18 (2006.01) G01N 33/53 (2006.01)

Patent

CA 2469815

A method is provided for separating a protein from one or more other proteins using hydroxyapatite chromatography in which the protein does not bind to hydroxyapatite but the other protein(s) does. In some embodiments, a second protein affixed to a solid support has been used previously to purify the protein by affinity chromatography, and small amounts of the second protein are introduced in the sample during this process. The protein being purified can comprise at least one constant antibody immunoglobulin domain. The second protein can bind to proteins comprising such a domain.

Cette invention concerne une méthode servant à séparer une protéine d'une ou plusieurs autres protéines par chromatographie d'adsorption sur hydroxyapatite dans laquelle la protéine ne se lie pas à l'hydroxyapatite alors que la ou les autres protéines le font. Dans certains modes de réalisation, une deuxième protéine fixée à un support solide a été utilisée préalablement pour purifier la protéine par chromatographie d'affinité, et de petites quantités de la deuxième protéine sont introduites dans l'échantillon au cours de ce procédé. La protéine purifiée peut comprendre au moins un domaine constant d'immunoglobuline. La deuxième protéine peut se lier à des protéines comprenant ce domaine.

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