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- W1990111624 abstract "Crude membrane fractions from Volvox carteri in the presence of detergent and metal complexing agent catalyze the transfer of glucose from dolichyl phosphate glucose to branched dolichyl diphosphate chitobiosyl pentamannoside Dol-PP-(GlcNAc)2-(Man)5, a known intermediate of the lipid-mediated pathway of N-glycosylation of proteins, resulting in the formation of Dol-PP-(GlcNAc)2-(Man)5-(Glc)1. Under the various conditions tested, neither Dol-P-Man nor other known mannosyl donors of the nucleoside-activated or lipid-activated type can serve as donor molecules for the elongation of the lipid-linked heptasaccharide. On the other hand, calf liver microsomes in similar experiments mannosylated the heptasaccharide further with Dol-P-Man up to a nonamannoside, Dol-PP-(GlcNAc)2-(Man)9. A direct glucosylation of the acceptor, however, with Dol-P-Glc failed in this system. The (GlcNAc)2-(Man)5-(Glc)1, obtained after mild acid hydrolysis of the above glycolipid is not significantly split by an unspecific alpha-glucosidase from yeast. However, Volvox microsomes liberated most of the glucose indicating a specific glucosidase in the membranes of the alga. This enzyme does not act on (GlcNAc)2-(Man)9-(Glc)1, the usual protein-linked carbohydrate intermediate of trimming processes of N-glycosidic glycoproteins. The data on glycolipid formation let us postulate that in Volvox the normal N-glycosylation pathway differs from that found in higher plants and animals either by a lack of evolution or by mutation in the genes coding for the mannosyl transferases involved." @default.
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- W1990111624 date "1984-01-01" @default.
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- W1990111624 title "Evidence for an incomplete dolichyl-phosphate pathway of lipoglycan formation in Volvox carteri f. nagariensis" @default.
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- W1990111624 doi "https://doi.org/10.1111/j.1432-1033.1984.tb07894.x" @default.
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