title: Usefulness of glycopeptide mapping by liquid chromatography/mass spectrometry in comparability assessment of glycoprotein products.
abstract: We previously reported on glycopeptide mapping of erythropoietin (EPO) by liquid chromatography/mass spectrometry (LC/MS). Using this method, glycopeptides in proteolytic digestion can be eluted before peptides, and are further separated on the basis of the carbohydrate structure. The detailed glycosylation at each glycosylation site can be elucidated based on mass chromatography and mass spectroscopy. In this study, we evaluated glycopeptide mapping with regard to its use in comparability assessment of glycoprotein products possessing multiple glycosylation sites. Models of closely related glycoprotein products used in this study are EPOs produced from three different sources. We previously reported that there are differences in the carbohydrate heterogeneity of these EPOs with regard to sialylation, acetylation, and sulphation patterns, using sugar mapping by LC/MS. In this paper, we demonstrated that glycopeptide mapping can distinguish site-specific glycosylation among these three EPOs and reveal the differences in acetylation, sialylation, and sulphation at each glycosylation site in one analysis. Our method can thus be useful in comparability assessment of therapeutic glycoproteins in terms of glycosylation.
authors.affiliation: Division of Biological Chemistry and Biologicals, National Institute of Health Sciences, 1-18-1, Kamiyoga, Setagaya-ku, Tokyo, 158-8501, Japan.
authors.forename: Miyako
authors.initials: M
authors.lastname: Ohta
authors.forename: Nana
authors.initials: N
authors.lastname: Kawasaki
authors.forename: Satsuki
authors.initials: S
authors.lastname: Itoh
authors.forename: Takao
authors.initials: T
authors.lastname: Hayakawa
mesh_terms: D000818:Animals; D016466:CHO Cells; D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D006224:Cricetinae; D004921:Erythropoietin / Q000737:chemistry / Q000302:isolation & purification; D006020:Glycopeptides / Q000737:chemistry / Q000302:isolation & purification*; D006031:Glycosylation; D015394:Molecular Structure; D009844:Oligosaccharides / Q000737:chemistry / Q000302:isolation & purification; D010449:Peptide Mapping / Q000379:methods*; D011994:Recombinant Proteins; D021241:Spectrometry, Mass, Electrospray Ionization / Q000379:methods*
chemical_list: D006020:Glycopeptides; D009844:Oligosaccharides; D011994:Recombinant Proteins; D004921:Erythropoietin