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- W1601403937 abstract "Purified glycolipids were tested for their ability to serve as acceptors of [14C]fucose from GDP-[14C]fucose as catalyzed by cell-free extracts and purified membrane fractions of human colorectal carcinoma cells, SW1116, cultured in serum-free medium. Purified lactotetraosyl ceramide (Galβ1→3GlcNAcβ1→3Galβ1→4Glc-Cer or LcOse4Cer) and H-1 glycolipid (Fucα1→2Galβ1→3GlcNAcβ1→3Galβ1→4Glc-Cer or IV2 FucαLcOse4Cer) stimulated incorporation of radioactivity into lipid-soluble glycolipid at a rate greater than ten times that of Lea glycolipid [Galβ1→3(Fucα1→4)GlcNAcβ1→3Galβ1→4Glc-Cer or III4 FucαLcOse4Cer]. The enzymatic activities in crude and purified membrane fractions were optimized for substrate concentrations (glycolipid and GDP-fucose), detergent requirement (taurocholate), pH, time and protein. The radioactive product of H-1 fucosylation migrated as discrete and distinct bands on high-performance thin-layer chromatograms (HPTLC). Evidence for their identity with Leb fucolipid described previously [Fucα1→2Galβ1→3(Fucα1→4)GlcNAcβ1→3Galβ1→4Glc-Cer or III4IV2 (Fucα) LcOse4Cer] is presented. The radioactive product of LcOse4Cer fucosylation was mainly Lea fucolipid as determined by co-migration with authentic Lea fucolipid in three HPTLC systems as native and acetylated derivatives. Our results also indicated a low level of H-1 and Leb glycolipid synthesis from LcOse4Cer. On the basis of the optima, linearity for time, and enzyme-limiting conditions, we obtained a 12–19-fold purification of the LcOse4Cer and H-1 fucosyl transferase acceptor activities in three peaks of a sucrose gradient. The peak with the highest specific activity (peak 3) was highest in density and in Na+, K+, ATPase specific activity, although NADH–cytochrome-c reductase and UDP-GalNac transferase were also present in peak 3. The apparent Km values of LcOse4Cer acceptor activity and H-1 acceptor activity in peak 3 were significantly different (p < 0.01) by statistical tests, 2.4 μM and 0.5 μM, respectively. These apparent Km values were much lower (103×) and the pH optima were lower (4.8–5.3), than the corresponding properties reported for the α1→3/α1→4 fucosyl transferase purified from human milk. Our results suggest a role for the non-glycosidic moieties of the acceptors and/or the tissue-specific or primitive expression of these fucosyl transferase activities." @default.
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- W1601403937 date "1987-10-01" @default.
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- W1601403937 title "Biosynthesis of Lewis fucolipid antigens in human colorectal carcinoma cells. Partial characterization of LcOse4Cer and H-1 fucolipid fucosyl transferase acceptor activities" @default.
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- W1601403937 doi "https://doi.org/10.1111/j.1432-1033.1987.tb13407.x" @default.
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