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• W2014800908 abstract "Asialofetuin sialyltransferase from Triton X-100 extracts of rat liver was resolved by phosphocellulose chromatography into two fractions, designated I and II in order of elution. When previously treated with Arthrobacter ureafaciens neuraminidase, fraction I eluted at about the same position as II while no alteration occurred in II. Primary rat hepatomas contained only a single asialofetuin sialyltransferase, identical to fraction I in chromatographic behavior. Transferases I and II were purified to near homogeneity. Transferase II, as well as neuraminidase-treated I, could be sialylated auto-catalytically, indicating that the lack of sialic acid in II is not due to the lack of a sialic-acid-accepting site. Both enzymes formed an (alpha 2 leads to 6)sialylgalactoside linkage with asialo-glycoproteins of the glycosylamine-type and with lactose, and were indistinguishable immunologically. Nevertheless, the transferases exhibited different molecular weights of 37000 (I) and 43000 (II). When heated at 50 degrees C, transferase I lost half its original activity within 20 min while II was scarcely inactivated. Kinetically, transferase I showed three-times higher affinity than II for CMP-N-acetylneuraminic acid and for desialylated plasma membrane. Asialofetuin sialyltransferase was also purified from primary rat hepatoma. The purified enzyme was identical to transferase I in every respect examined. We conclude that hepatomas contain transferase I but lack transferase II." @default.
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• W2014800908 date "1982-08-01" @default.
• W2014800908 modified "2023-09-23" @default.
• W2014800908 title "Purification and characterization of beta-galactoside (alpha 2 leads to 6)sialyltransferase from rat liver and hepatomas." @default.
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