Synthesis of Nucleotide-Activated Oligosaccharides by ?-Galactosidase from Bacillus circulans
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Astrid Zervosen
Abstract
The enzymatic access to nucleotideactivated oligosaccharides by a glycosidasecatalyzed transglycosylation reaction was explored. The nucleotide sugars UDPGlcNAc and UDPGlc were tested as acceptor substrates for ?galactosidase from Bacillus circulans using lactose as donor substrate. The UDPdisaccharides Gal(?1-4)GlcNAc(?1-UDP) (UDPLacNAc) and Gal(?1 4) Glc(?1-UDP) (UDPLac) and the UDPtrisaccharides Gal(?1-4)Gal(?1-4)GlcNAc(?1- UDP and Gal(?1 4 ) Gal(?1 4 ) Glc(?1-UDP) were formed stereo and regioselectively. Their chemical structures were characterized by [1]H and [13]C NMR spectroscopy and fast atom bombardment mass spectrometry. The synthesis in frozen solution at -5 C instead of 30 C gave significantly higher product yields with respect to the acceptor substrates. This was due to a remarkably higher product stability in the small liquid phase of the frozen reaction mixture. Under optimized conditions, at 5 C and pH 4.5 with 500 mM lactose and 100 mM UDPGlcNAc, an overall yield of 8.2% (81.8 mol, 62.8 mg with 100% purity) for Gal(b1 4 ) GlcNAc(?1-UDP) and 3.6% (36.1 mol, 35 mg with 96% purity) for Gal(?1-4)Gal(?1-4)GlcNAc(?1- UDP) was obtained. UDPGlc as acceptor gave an overall yield of 5.0% (41.3 mol, 32.3 mg with 93% purity) for Gal(?1-4)Glc(?1-UDP) and 1.6% (13.0 mol, 12.2 mg with 95% purity) for Gal(?1-4)Gal(?1- 4)Glc(?1-UDP). The analysis of other nucleotide sugars revealed UDPGal, UDPGalNAc, UDPXyl and dTDP, CDP, ADP and GDPGlc as further acceptor substrates for ?galactosidase from Bacillus circulans.
Copyright © 2001 by Walter de Gruyter GmbH & Co. KG
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- Highlight: Glycobiology
- O-Glycosylation of the Mucin Type
- Glycoproteins from Insect Cells: Sialylated or Not?
- Congenital Disorders of Glycosylation: Glycosylation Defects in Man and Biological Models for Their Study
- Mitochondrial Single-Stranded DNA-Binding Proteins: in Search for New Functions
- Do Rodent and Human Brains Have Different N-Glycosylation Patterns?
- The Liver Flukes Fasciola gigantica and Fasciola hepatica Express the Leucocyte Cluster of Differentiation Marker CD77 (Globotriaosylceramide) in Their Tegument
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