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To explore whether there is an inter-relationship between the rate of low-density (LD) lipoprotein binding to its receptor and the formation of dolichol-linked oligosaccharides, experiments were performed with human fibroblasts where the synthesis of lipoprotein receptor and dolichyl saccharides was under control of LD lipoprotein and compactin. Pretreatment of the cells with nonlabelled LD lipoprotein resulted in a suppression of both the binding of 125I-labelled LD lipoprotein to the receptor and the synthesis of dolichyl saccharides from [14C]acetate and [3H]mannose, but not from [3H]mevalonolactone. Compactin, in contrast, inhibited only the formation of dolichol-linked oligosaccharides. Mevalonolactone (1 microM) abolished the inhibitory effect of LD lipoprotein on dolichyl saccharide formation, but was not able to restore the receptor-binding capacity, thus suggesting that the synthesis of lipoprotein receptor is not coupled to the formation of dolichyl saccharides.

biochemical journal. cellular aspects

Action of low-density lipoprotein and compactin, a competitive inhibitor of 3-hydroxy-3-methylglutaryl-CoA reductase, on the synthesis of dolichol-linked oligosaccharides and low-density-lipoprotein receptor in human skin fibroblasts