title: Asn-linked sugar chain structures of recombinant human thrombopoietin produced in Chinese hamster ovary cells.
abstract: Human thrombopoietin (TPO) that regulates the numbers of megakaryocytes and platelets is a heavily N- and O-glycosylated glycoprotein hormone with partial homology to human erythropoietin (EPO). We prepared recombinant human TPO produced in Chinese hamster ovary (CHO) cells and analyzed the sugar chain structures quantitatively using 2-aminobenzamide labeling, sequential glycosidase digestion and matrix-assisted laser desorption ionization time-of-flight mass spectrometry (MALDI-TOF/MS). We found bi-, tri- and tetraantennary complex-type sugar chains with one or two N-acetyllactosamine repeats, which are common to recombinant human EPO produced in CHO cells. On the other hand, there were triantennary sugar chains with one or two N-acetyllactosamine repeats that were specific to the recombinant human TPO, and their distributions of branch structures were also different. These results suggested that proximal protein structure should determine the branch structure of Asn-linked sugar chains in addition to the glycosyltransferases subset.
authors.affiliation: Pharmaceutical Development Laboratory, KIRIN Brewery Co., Ltd., Takasaki, Gunma, Japan. no-inoue@kirin.co.jp
authors.forename: N
authors.initials: N
authors.lastname: Inoue
authors.forename: T
authors.initials: T
authors.lastname: Watanabe
authors.forename: T
authors.initials: T
authors.lastname: Kutsukake
authors.forename: H
authors.initials: H
authors.lastname: Saitoh
authors.forename: H
authors.initials: H
authors.lastname: Tsumura
authors.forename: H
authors.initials: H
authors.lastname: Arai
authors.forename: M
authors.initials: M
authors.lastname: Takeuchi
mesh_terms: D000818:Animals; D001216:Asparagine / Q000378:metabolism*; D016466:CHO Cells; D050260:Carbohydrate Metabolism; D002240:Carbohydrate Sequence; D003001:Cloning, Molecular; D006224:Cricetinae; D006031:Glycosylation; D006801:Humans; D008969:Molecular Sequence Data; D009844:Oligosaccharides / Q000737:chemistry* / Q000378:metabolism; D011994:Recombinant Proteins; D019032:Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization; D013926:Thrombopoietin / Q000235:genetics / Q000378:metabolism*; D014162:Transfection
chemical_list: D009844:Oligosaccharides; D011994:Recombinant Proteins; D001216:Asparagine; D013926:Thrombopoietin