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O ‐Mannosylation of recombinant human insulin‐like growth factor I (IGF‐I) produced in Saccharomyces cerevisiae
Author(s) -
Hård Karl,
Bitter Wilbert,
Kamerling Johannis P.,
Vliegenthart Johannes F.G.
Publication year - 1989
Publication title -
febs letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.593
H-Index - 257
eISSN - 1873-3468
pISSN - 0014-5793
DOI - 10.1016/0014-5793(89)80442-9
Subject(s) - mannose , chemistry , oligosaccharide , saccharomyces cerevisiae , tetrasaccharide , biochemistry , glycoprotein , recombinant dna , gel permeation chromatography , carbohydrate , chromatography , yeast , organic chemistry , polysaccharide , polymer , gene
A glycosylated form of recombinant human insulin‐like growth factor I (IGF‐I) expressed in Saccharomyces cerevisiae was shown to contain mannose as the only carbohydrate constituent. All oligosaccharide chains of the glycoprotein could be released by mild alkaline treatment, and separated from the protein by gel‐permeation chromatography on Bio‐Gel P‐2. The structures of these O ‐linked carbohydrate chains were determined by 500‐MHz 1 H‐NMR spectroscopy, affording the disaccharide Manα1‐2Man as the major component and the tetrasaccharide Manα1‐3Manα1‐2Manα1‐2Man as a minor component. Reference oligosaccharides were prepared from mannoproteins released from the cell wall of S. cerevisiae X2180 (α‐wild type). In addition to previously reported structures, ranging from mannose to mannotetraose, the pentasaccharide Manα1‐3Manα1‐3Manα1‐2Manα1‐2Man was identified in the cell wall mannoprotein.