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Glycobiology, Vol 9, 353-364, Copyright © 1999 by Oxford University Press

ORIGINAL ARTICLES

Enzymatic synthesis of natural and 13C enriched linear poly-N- acetyllactosamines as ligands for galectin-1

S Di Virgilio, J Glushka, K Moremen and M Pierce
Department of Biochemistry and Molecular Biology and Complex Carbohydrate Research Center, University of Georgia, Athens,GA 30602- 7229, USA.

As part of a study of protein-carbohydrate interactions, linear N- acetyl-polyllactosamines [Galbeta1,4GlcNAcbeta1,3]nwere synthesized at the 10-100 micromol scale using enzymatic methods. The methods described also provided specifically [1-13C]-galactose-labeled tetra- and hexasaccharides ([1-13C]-Galbeta1,4GlcNAcbeta1,3Galbeta1,4Glc and Galbeta1, 4GlcNAcbeta1,3[1-13C]Galbeta1,4GlcNAcbeta1,3Galbeta 1,4Glc) suitable for NMR studies. Two series of oligosaccharides were produced, with either glucose or N-acetlyglucosamine at the reducing end. In both cases, large amounts of starting primer were available from human milk oligosaccharides (trisaccharide primer GlcNAcbeta1,3Galbeta1, 4Glc) or via transglycosylation from N-acetyllactosamine. Partially purified and immobilized glycosyltransferases, such as bovine milk beta1,4 galactosyltransferase and human serum beta1,3 N- acetylglucosaminyltransferase, were used for the synthesis. All the oligo-saccharide products were characterized by1H and13C NMR spectroscopy and MALDI-TOF mass spectrometry. The target molecules were then used to study their interactions with recombinant galectin-1, and initial1H NMR spectroscopic results are presented to illustrate this approach. These results indicate that, for oligomers containing up to eight sugars, the principal interaction of the binding site of galectin- 1 is with the terminal N-acetyllactosamine residues.
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