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We have cloned two GalNAc-4-sulfotransferases, GalNAc-4-ST1 and GalNAc-4-ST2, that transfer sulfate to terminal β1,4-linked GalNAc. In conjunction with the action of protein-specific β1,4GalNAc-transferases, GalNAc-4-ST1 and GalNAc-4-ST2 account for the presence of terminal β1,4-linked...
Isolation of glycopeptides utilizing hydrogen bonding between glycopeptide glycans and a carbohydrate-gel matrix in the organic phase is useful for site-specific characterization of oligosaccharides of glycoproteins, when combined with mass spectrometry. In this study, recovery of glycopeptides...
The biological activity of a lectin is influenced by its quaternary structure. Viscumin is special among the family members of toxic AB-type plant lectins, because it triggers mitogenicity, toxicity, and agglutination. Its activity profile is dependent on the concentration, motivating a thorough...
The major neutral glycosphingolipids (GSLs) of High Five insect cells have been extracted, purified, and characterized. It was anticipated that GSLs from High Five cells would follow the arthro-series pathway, known to be expressed by both insects and nematodes at least through the common...
The chondroitin/dermatan sulfate proteoglycans (CS/DSPGs), biglycan, decorin, and versican play several important roles in extracellular matrix influencing matrix organization, cell proliferation, and recruitment. Moreover, they bind and regulate growth factors in the extracellular matrix. We...
Recent studies have begun to investigate the role of agrin in brain and suggest that agrin’s function likely extends beyond that of a synaptogenic protein. Particularly, it has been shown that agrin is associated with the pathological lesions of Alzheimer’s disease (AD) and may contribute to...
Defects in the biosynthesis of N - and core 1 O -glycans may be found by isoelectric focusing (IEF) of plasma transferrin and apolipoprotein C-III (apoC-III). We hypothesized that IEF of transferrin and apoC-III in combination with sodium dodecyl sulphate–polyacrylamide gel electrophoresis...
In the central reaction of N-linked glycosylation, the oligosaccharyltransferase (OTase) complex catalyzes the transfer of a lipid-linked core oligosaccharide onto asparagine residues of nascent polypeptide chains in the lumen of the endoplasmic reticulum (ER). The Saccharomyces cerevisiae OTase...
Untreated classic galactosemia (galactose-1-phosphate uridyltransferase (GALT) deficiency) is known as a secondary congenital disorders of glycosylation (CDG) characterized by galactose deficiency of glycoproteins and glycolipids (processing defect or CDG-II). The mechanism of this...
Oligosaccharyl transferase (OT) scans and selectively glycosylates –Asn-X-Thr/Ser-motifs in nascent polypeptide chains in the endoplasmic reticulum (ER). Several groups have reported different results for the composition of this enzyme complex. In this study, using a membrane protein two-hybrid...
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