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J. Biol. Chem., Vol. 265, Issue 25, 15067-15075, Sep, 1990

Purification of H gene-encoded beta-galactoside alpha 1----2 fucosyltransferase from human serum

A Sarnesto, T Kohlin, J Thurin and M Blaszczyk-Thurin
Wistar Institute of Anatomy and Biology, Philadelphia, Pennsyvlania 19104.

The human serum enzyme, beta-galactoside alpha 1----2 fucosyltransferase, presumably blood group H gene-encoded, was purified to homogeneity from serum of AB and mixed secretor phenotype individuals. The purification procedure involved chromatography on phenyl-Sepharose, S-Sepharose, GDP-hexanolamine-Sepharose, and high pressure liquid chromatography gel filtration. The enzyme was purified 10 x 10(6)-fold, with a final specific activity of 23.6 units/mg for the phenyl-beta-O-galactoside acceptor. The apparent Mr of the H gene- encoded beta-galactoside alpha 1----2 fucosyltransferase was determined as 200,000 and 50,000 by sodium dodecyl sulfate-polyacrylamide gel electrophoresis in nonreducing and reducing conditions, respectively. The Mr of native enzyme was found by gel filtration chromatography to be 148,000. The subunit structure as well as the sensitivity of the enzymatic activity to beta-mercaptoethanol suggest that the native enzyme exists in polymeric form of covalently bound subunits. Lectin binding properties of the purified molecule indicate that the enzyme is glycosylated. Another human serum beta-galactoside alpha 1----2 fucosyltransferase, presumably Se gene-encoded, was separated from the H enzyme by adsorption on S-Sepharose cation exchange matrix. A comparison of the kinetic parameters of the initial rate data of both alpha 1----2 fucosyltransferases revealed differences between Km values for various oligosaccharide acceptors. Higher Km values for the phenyl- beta-O-galactoside acceptor and a lower Km for the lacto-N-tetraose- beta-O-PA8 type 1 acceptor for the enzyme that adsorbed to S-Sepharose compared with nonadsorbed enzyme were observed. The two enzymes also were differentiated by binding properties to S-Sepharose and electrophoretic mobilities on native gel electrophoresis. We, therefore, postulate that the enzyme which does not adsorb to S- Sepharose and adsorbed enzyme are structurally different molecules and they represent the H and Se gene-encoded beta-galactoside alpha 1----2 fucosyltransferases, respectively.
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