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- W133676334 abstract "Processing of N-linked oligosaccharides in Saccharomyces cerevisiae begins with the removal of glucose and mannose residues from Glc3Man9GlcNAc2 to form a single isomer of Man8GlcNAc2. The importance of mannose removal for subsequent outer chain synthesis was examined in strains of S. cerevisiae disrupted in the MNS1 gene encoding a specific alpha 1,2-mannosidase responsible for Man8GlcNAc2 synthesis [Camirand, Heysen, Grondin and Herscovics (1991) J. Biol. Chem. 266, 15120-15127]. Both MNS1 transcripts of 1.85 kb and 1.7 kb were not observed in Northern blots of mns1 cells (i.e. cells containing the disrupted gene). Analysis on Bio-Gel P-6 of endo-beta-N-acetylglucosaminidase-H-sensitive oligosaccharides following a 10 min pulse with [2-3H]mannose revealed similar amounts of labelled outer chains excluded from the gel in both control and mns1 cells. H.p.l.c. of the included oligosaccharides showed that a Man9GlcNAc, rather than a Man8GlcNAc, intermediate was formed in mns1 cells. Analysis of [3H]mannose-labelled core oligosaccharides from immunoprecipitated CPY and invertase by h.p.l.c. showed a similar size distribution in mns1 and control cells. Invertase immunoprecipitated from [35S]methionine-labelled mns1 cells was highly glycosylated, but migrated slightly faster than that from control cells on denaturing PAGE, indicating a small difference in glycosylation. A similar difference in mobility was observed for invertase activity stain following non-denaturing gel electrophoresis. It is concluded that the alpha-mannosidase encoded by MNS1 is the only enzyme responsible for mannose removal in vivo, and that this processing step is not essential for outer chain synthesis." @default.
- W133676334 created "2016-06-24" @default.
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- W133676334 date "1993-02-15" @default.
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- W133676334 title "Disruption of the processing <i>α</i>-mannosidase gene does not prevent outer chain synthesis in <i>Saccharomyces cerevisiae</i>" @default.
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- W133676334 doi "https://doi.org/10.1042/bj2900021" @default.
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