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• W2071299534 endingPage "20996" @default.
• W2071299534 startingPage "20987" @default.
• W2071299534 abstract "Five different human α(1,3)-fucosyltransferase (α(1,3)-Fuc-T) genes have been cloned. Their corresponding enzymes catalyze the formation of various α(1,3)- and α(1,4)-fucosylated cell surface oligosaccharides, including several that mediate leukocyte-endothelial cell adhesion during inflammation. Inhibitors of such enzymes are predicted to operate as anti-inflammatory agents; in principle, the isolation or design of such agents may be facilitated by identifying peptide segment(s) within these enzymes that interact with their oligosaccharide acceptor substrates. Little is known, however, about the structural features of α(1,3)-Fuc-Ts that dictate acceptor substrate specificity. To begin to address this problem, we have created and functionally characterized a series of 21 recombinant α(1,3)-Fuc-T chimeras derived from three human α(1,3)-Fuc-Ts (Fuc-TIII, Fuc-TV, and Fuc-TVI) that maintain shared and distinct polypeptide domains and that exhibit common as well as idiosyncratic acceptor substrate specificities. The in vivo acceptor substrate specificities of these α(1,3)-Fuc-T chimeras, and of their wild type progenitors, were determined by characterizing the cell surface glycosylation phenotype determined by these enzymes, after expressing them in a mammalian cell line informative for the synthesis of four distinct α(1,3)- and α(1,4)-fucosylated cell surface oligosaccharides (Lewis x, sialyl Lewis x, Lewis a, and sialyl Lewis a). Our results indicate that as few as 11 nonidentical amino acids, found within a “hypervariable” peptide segment positioned at the NH2 terminus of the enzymes' sequence-constant COOH-terminal domains, determines whether or not these α(1,3)-Fuc-T can utilize type I acceptor substrates to form Lewis a and sialyl Lewis a moieties. Five different human α(1,3)-fucosyltransferase (α(1,3)-Fuc-T) genes have been cloned. Their corresponding enzymes catalyze the formation of various α(1,3)- and α(1,4)-fucosylated cell surface oligosaccharides, including several that mediate leukocyte-endothelial cell adhesion during inflammation. Inhibitors of such enzymes are predicted to operate as anti-inflammatory agents; in principle, the isolation or design of such agents may be facilitated by identifying peptide segment(s) within these enzymes that interact with their oligosaccharide acceptor substrates. Little is known, however, about the structural features of α(1,3)-Fuc-Ts that dictate acceptor substrate specificity. To begin to address this problem, we have created and functionally characterized a series of 21 recombinant α(1,3)-Fuc-T chimeras derived from three human α(1,3)-Fuc-Ts (Fuc-TIII, Fuc-TV, and Fuc-TVI) that maintain shared and distinct polypeptide domains and that exhibit common as well as idiosyncratic acceptor substrate specificities. The in vivo acceptor substrate specificities of these α(1,3)-Fuc-T chimeras, and of their wild type progenitors, were determined by characterizing the cell surface glycosylation phenotype determined by these enzymes, after expressing them in a mammalian cell line informative for the synthesis of four distinct α(1,3)- and α(1,4)-fucosylated cell surface oligosaccharides (Lewis x, sialyl Lewis x, Lewis a, and sialyl Lewis a). Our results indicate that as few as 11 nonidentical amino acids, found within a “hypervariable” peptide segment positioned at the NH2 terminus of the enzymes' sequence-constant COOH-terminal domains, determines whether or not these α(1,3)-Fuc-T can utilize type I acceptor substrates to form Lewis a and sialyl Lewis a moieties." @default.
• W2071299534 created "2016-06-24" @default.
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• W2071299534 date "1995-09-01" @default.
• W2071299534 modified "2023-09-27" @default.
• W2071299534 title "Human α(1,3/1,4)-Fucosyltransferases Discriminate between Different Oligosaccharide Acceptor Substrates through a Discrete Peptide Fragment" @default.
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• W2071299534 doi "https://doi.org/10.1074/jbc.270.36.20987" @default.
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