期刊
JOURNAL OF BIOLOGICAL CHEMISTRY
卷 285, 期 3, 页码 1582-1586出版社
AMER SOC BIOCHEMISTRY MOLECULAR BIOLOGY INC
DOI: 10.1074/jbc.C109.065409
关键词
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资金
- National Institutes of Health [GM061126]
- Deutsche Forschungsgemeinschaft (DFG)
The epidermal growth factor repeats of the Notch receptor are extensively glycosylated with three different O-glycans. O-Fucosylation and elongation by the glycosyltransferase Fringe have been well studied and shown to be essential for proper Notch signaling. In contrast, biosynthesis of O-glucose and O-N-acetylglucosamine is less well understood. Recently, the isolation of the Drosophila mutant rumi has shown that absence of O-glucose impairs Notch function. O-Glucose is further extended by two contiguous alpha 1,3-linked xylose residues. We have identified two enzymes of the human glycosyltransferase 8 family, now named GXYLT1 and GXYLT2 (glucoside xylosyltransferase), as UDP-D-xylose:beta D-glucoside alpha 1,3-D-xylosyltransferases adding the first xylose. The enzymes are specific for beta-glucose-terminating acceptors and UDP-xylose as donor substrate. Generation of the alpha 1,3-linkage was confirmed by nuclear magnetic resonance. Activity on a natural acceptor could be shown by in vitro xylosylation of a Notch fragment expressed in a UDP-xylose-deficient cell line and in vivo by co-expression of the enzymes and the Notch fragment in insect cells followed by mass spectrometric analysis of peptide fragments.
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