title: Comparative study of the asparagine-linked sugar chains of natural human interferon-beta 1 and recombinant human interferon-beta 1 produced by three different mammalian cells.
abstract: The asparagine-linked sugar chains of natural interferon-beta 1 secreted from human foreskin fibroblasts by poly I:poly C induction and of three recombinant human interferon-beta 1 produced by Chinese hamster ovary cells, mouse epithelial cells (C127), and human lung adenocarcinoma cells (PC8) were released quantitatively as oligosaccharides by hydrazinolysis followed by N-acetylation. After being reduced with either NaB3H4 or NaB2H4, their structures were comparatively analyzed. More than 80% of the sugar chains of natural interferon-beta 1 occur as biantennary complex-type sugar chains, approximately 10% of which contain N-acetyllactosamine repeating structure in their outer chain moieties. The remainders are 2,4- and 2,6-branched triantennary complex-type sugar chains. The sugar chains of the recombinant interferon-beta 1 derived from Chinese hamster ovary cells were very similar to those of its natural counterpart. In contrast, two other recombinant proteins contain quite different sugar chains. The protein derived from C127 cells contains complex-type sugar chains with the Gal alpha 1----3Gal beta 1----4GlcNAc group in their outer chain moieties. Their sialic acid residues occur solely as the Sia alpha 2----6Gal group, where Sia is sialic acid. In contrast, the sialic acid residues of other interferon-beta 1 occur as the Sia alpha 2----3Gal group only. A part of the sugar chains of the protein derived from PC8 cells contains bisecting N-acetylglucosamine residue in addition to the Gal alpha 1----3Gal beta 1----4GlcNAc group.
authors.affiliation: Department of Biochemistry, University of Tokyo, Japan.
authors.forename: Y
authors.initials: Y
authors.lastname: Kagawa
authors.forename: S
authors.initials: S
authors.lastname: Takasaki
authors.forename: J
authors.initials: J
authors.lastname: Utsumi
authors.forename: K
authors.initials: K
authors.lastname: Hosoi
authors.forename: H
authors.initials: H
authors.lastname: Shimizu
authors.forename: N
authors.initials: N
authors.lastname: Kochibe
authors.forename: A
authors.initials: A
authors.lastname: Kobata
mesh_terms: D001216:Asparagine; D002236:Carbohydrate Conformation; D002240:Carbohydrate Sequence; D002460:Cell Line; D002478:Cells, Cultured; D002846:Chromatography, Affinity; D006801:Humans; D007370:Interferon Type I / Q000235:genetics; D008297:Male; D008745:Methylation; D008969:Molecular Sequence Data; D009844:Oligosaccharides / Q000302:isolation & purification*; D011994:Recombinant Proteins; D012867:Skin / Q000378:metabolism
chemical_list: D007370:Interferon Type I; D009844:Oligosaccharides; D011994:Recombinant Proteins; D001216:Asparagine