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pubmed-article:8660631pubmed:abstractTextThe chemical synthesis and utilization of two photoaffinity analogs, 125I-labeled 5-[3-(p-azidosalicylamido)-1-propenyl]-UDP-GlcNAc and -UDP-GalNAc, is described. Starting with either UDP-GlcNAc or UDP-GalNAc, the synthesis involved the preparation of the 5-mercuri-UDP-HexNAc and then attachment of an allylamine to the 5 position to give 5-(3-amino)allyl-UDP-HexNAc. This was followed by acylation with N-hydroxysuccinimide p-aminosalicylic acid to form the final product, i.e., 5-[3-(p-azidosalicylamido)-1-propenyl]-UDP-GlcNAc or UDP-GalNAc. These products could then be iodinated with chloramine T to give the 125I-derivatives. Both the UDP-GlcNAc and the UDP-GalNAc derivatives reacted in a concentration-dependent manner with a highly purified UDP-HexNAc pyrophosphorylase, and both specifically labeled the subunit(s) of this protein. The labeling of the protein by the UDP-GlcNAc derivative was inhibited in dose-dependent fashion by either unlabeled UDP-GlcNAc or unlabeled UDP-GalNAc. Likewise, labeling with the UDP-GalNAc probe was blocked by either UDP-GlcNAc or UDP-GalNAc. The UDP-GlcNAc probe also specifically labeled a partially purified preparation of GlcNAc transferase I.lld:pubmed
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pubmed-article:8660631pubmed:dateRevised2007-11-14lld:pubmed
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pubmed-article:8660631pubmed:articleTitleSynthesis of aryl azide derivatives of UDP-GlcNAc and UDP-GalNAc and their use for the affinity labeling of glycosyltransferases and the UDP-HexNAc pyrophosphorylase.lld:pubmed
pubmed-article:8660631pubmed:affiliationDepartment of Biochemistry and Molecular Biology, University of Arkansas for Medical Sciences, Little Rock, Arkansas, 72205, USA.lld:pubmed
pubmed-article:8660631pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:8660631pubmed:publicationTypeResearch Support, U.S. Gov't, P.H.S.lld:pubmed