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• W2169827355 startingPage "793" @default.
• W2169827355 abstract "Alpha(1,3)Galactosyltransferase (GT) is a Golgi-localized enzyme that catalyzes the transfer of a terminal galactose to N-acetyllactosamine to create Galalpha(1,3)Gal. This glycosyltransferase has been studied extensively because the Galalpha(1,3)Gal epitope is involved in hyperacute rejection of pig-to-human xenotransplants. The original crystal structure of bovine GT defines the amino acids forming the catalytic pocket; however, those directly involved in the interaction with the donor nucleotide sugars were not characterized. Comparison of amino acid sequences of GT from several species with the human A and B transferases suggest that His271 of pig GT may be critical for recognition of the donor substrate, UDP-Gal. Using pig GT as the representative member of the GT family, we show that replacement of His271 with Ala, Leu, or Gly caused complete loss of function, in contrast to replacement with Arg, another basic charged residue, which did not alter the ability of GT to produce Galalpha(1,3)Gal. Molecular modeling showed that His271 may interact directly with the Gal moiety of UDP-Gal, an interaction possibly retained by replacing His with Arg. However, replacing His271 with amino acids found in alpha(1,3)GalNAc transferases did not change the donor nucleotide specificity. Thus His271 is critical for enzymatic function of pig GT." @default.
• W2169827355 created "2016-06-24" @default.
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• W2169827355 creator A5049970438 @default.
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• W2169827355 date "2002-12-01" @default.
• W2169827355 modified "2023-10-10" @default.
• W2169827355 title "Histidine 271 has a functional role in pig -1,3galactosyltransferase enzyme activity" @default.
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• W2169827355 doi "https://doi.org/10.1093/glycob/cwf092" @default.
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• W2169827355 hasPublicationYear "2002" @default.
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