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A comparison of galactosyltransferase activity in mouse ascites lymphoma cells (Ly/Ya), in cultured lymphoma cells, in ascitic fluid and culture medium.

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Comparative studies were carried out on the galactosyltransferase activity in ascites lymphoma cells isolated from mouse with ascitic lymphoma Ly/Ya, in these cells grown in vitro (24 hrs culture), in ascitic fluid and culture medium. The effect of varying amounts of UDP-galactose on transfer rate of galactose to ovomucoid by the cell enzyme (ascitic and cultured lymphoma cells) and by the soluble enzyme (ascitic fluid and culture medium) was studied. The activity of the enzyme in the cell culture medium was 2.5-fold higher than that in ascitic fluid. The apparent Km values for UDP-galactose of the enzyme from both kinds of cells and from the two fluids was 7.14 x 10(-7) M. At saturating concentrations of donor substrate, V values for the cells and culture medium was 765 pmoles/10(6) cells/h and 180 pmoles/10(6) cells/h for the ascitic fluid.

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