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Partial characterization of microsomal sialyltransferase from chicken liver and hepatoma Mc-29: II. Measurement of enzyme activities utilizing microsomal glycoproteins as exogenous acceptors.

摘要:

Microsomal sialyltransferase was assayed in chicken liver and hepatoma Mc-29 utilizing liver and hepatoma microsomal glycoprotein fractions, treated with Triton X-100, as exogenous acceptors. In a homologous assay system containing enzyme and acceptor from one and the same tissue no quantitative dependence of enzyme activity was revealed with increasing amount of the acceptor. In mixed experiments in which liver enzyme activity was tested towards hepatoma acceptor glycoproteins, a gradual drop in sialyltransferase activity occurred with increasing quantities of the acceptor. This effect seems to be a consequence of the presence of some inhibitor in the microsomal fractions from the hepatoma cells.

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