Galactose-alpha-1, 3-galactose-containing n-glycans in glycoprotein products derived from CHO cells
First Claim
1. A method of producing a recombinant therapeutic fusion protein, comprising the steps of:
- (a) culturing Chinese hamster ovary (CHO) cells under conditions suitable for expression of a recombinant therapeutic fusion protein comprising one or more glycans, wherein the CHO cells have not been genetically engineered to produce terminal alpha-galactosyl residues on glycans;
(b) treating the one or more glycans of the fusion protein with one or more exoglycosidases;
(c) measuring glycans containing terminal galactose-alpha-1-3-galactose residues on the fusion protein by nuclear magnetic resonance (NMR); and
(d) producing a recombinant therapeutic fusion protein in the CHO cells if a target level of terminal galactose-alpha-1-3-galactose residues is measured.
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Accused Products
Abstract
Methods of producing recombinant therapeutic fusion proteins described herein can include culturing Chinese hamster ovary (CHO) cells under conditions suitable for expression of a recombinant therapeutic fusion protein including one or more glycans, where the CHO cells have not been genetically engineered to produce terminal alpha-galactosyl residues on glycans; treating the one or more glycans of the recombinant glycoprotein with one or more exoglycosidases; measuring glycans containing terminal galactose-alpha-1-3-galactose residues on the fusion protein by nuclear magnetic resonance (NMR); and producing a recombinant therapeutic fusion protein in the CHO cells if a target level of terminal galactose-alpha-1-3-galactose residues is measured.
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Citations
17 Claims
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1. A method of producing a recombinant therapeutic fusion protein, comprising the steps of:
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(a) culturing Chinese hamster ovary (CHO) cells under conditions suitable for expression of a recombinant therapeutic fusion protein comprising one or more glycans, wherein the CHO cells have not been genetically engineered to produce terminal alpha-galactosyl residues on glycans; (b) treating the one or more glycans of the fusion protein with one or more exoglycosidases; (c) measuring glycans containing terminal galactose-alpha-1-3-galactose residues on the fusion protein by nuclear magnetic resonance (NMR); and (d) producing a recombinant therapeutic fusion protein in the CHO cells if a target level of terminal galactose-alpha-1-3-galactose residues is measured. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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Specification