Reference: Parodi AJ (1979)
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Abstract
The oligosaccharides previously bound to dolichol diphosphate were isolated from Saccharomyces cerevisiae cells incubated with [U-14C]glucose. Five compounds were obtained that migrated with RGlucose of 0.100, 0.120, 0.145, 0.180, and 0.215 on paper chromatography. All of them contained mannose and 2 N-acetylhexosamine residues. The substances that migrated with the three lower RGlucose values had, in addition, glucose units. The structure of the oligosacchardies was very similar if not identical with that of the oligosaccharides isolated from the dolichol diphosphate derivatives synthesized "in vitro" by yeast or rat liver particulate preparations or "in vivo" by dog thyroid or rat liver slices as judged by their migration on paper chromatography, monosaccharide composition, and degradation compounds produced by alpha-mannosidase treatment or acetolysis. The oligosaccharides previously bound to asparagine residues in proteins were isolated from yeast cells which had been pulsed with [U-14C]glucose and chased with medium containing the unlabeled monosaccharide. The samples taken after very short pulses contained four oligosaccharides that migrated with RGlucose of 0.100, 0.120, 0.145, and 0.180 on paper chromatography. The first three compounds contained glucose, mannose, and 2 N-acetylhexosamine residues whereas the one that migrated with a RGlucose of 0.180 was devoid of the former monosaccharide. Samples taken after short chase periods revealed that the compounds that migrated with the lower RGlucose values gradually disappeared and were converted to the oligosaccharide with the higher RGlucose value was they lost their glucose residues. Similar analysis as those mentioned above showed that the structures of these compounds were similar to those of the dolichol diphosphate-bound oligosaccharides. Samples taken after longer chase periods revealed that the oligosaccharide that migrated with a RGlucose of 0.180 was subsequently either enlarged by the addition of more mannose residues or trimmed to smaller sizes.
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Parodi AJ
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