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Purification, Properties and Possible Gene Assignment of an Alpha 1,3-fucosyltransferase Expressed in Human Liver

Overview
Journal Glycoconj J
Publisher Springer
Date 1995 Dec 1
PMID 8748166
Citations 4
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Abstract

alpha 1,3-Fucosyltransferase solubilized from human liver has been purified 40,000-fold to apparent homogeneity by a multistage process involving cation exchange chromatography on CM-Sephadex, hydrophobic interaction chromatography on Phenyl Sepharose, affinity chromatography on GDP-hexanolamine Sepharose and HPLC gel exclusion chromatography. The final step gave a major protein peak that co-chromatographed with alpha 1,3-fucosyltransferase activity and had a specific activity of approximately 5-6 mumol min-1 mg-1 and an M(r) approximately 44,000 deduced from SDS-PAGE and HPLC analysis. The purified enzyme readily utilized Gal beta 1-4GlcNAc, NeuAc alpha 2-3Gal beta 1-4GlcNAc and Fuc alpha 1-2Gal beta 1-4GlcNAc, with a preference for sialylated and fucosylated Type 2 acceptors. Fuc alpha 1-2Gal beta 1-4Glc and the Type 1 compound Gal beta 1-3GlcNAc were very poor acceptors and no incorporation was observed with NeuAc alpha 2-6Gal beta 1-4GlcNAc. A polyclonal antibody raised against the liver preparation reacted with the homologous enzyme and also with the blood group Lewis gene-associated alpha 1,3/1,4-fucosyltransferase purified from the human A431 epidermoid carcinoma cell line. No cross reactivity was found with alpha 1,3-fucosyltransferase(s) isolated from myeloid cells. Examination by Northern blot analysis of mRNA from normal liver and from the HepG2 cell line, together with a comparison of the specificity pattern of the purified enzyme with that reported for the enzyme expressed in mammalian cells transfected with the Fuc-TVI cDNA, suggests a provisional identification of Fuc-TVI as the major alpha 1,3-fucosyltransferase gene expressed in human liver.

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