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Proteoglycans (PGs), including heparan sulfate forms, are important regulators of tumor progression. In the PGs biosynthetic process, the core protein is synthesized on a ribosomal template and the sugar chains are assembled post-translationally, one sugar at a time, starting with the linkage of xylose to a serine residue of the core protein and followed by galactosidation of the xylosylprotein. Hydrophobic xylopyranosides have been previously shown to prime heparan sulfate synthesis, a property that was required to cause growth inhibition of tumor cells. To know if the antiproliferative activity of synthetic xylopyranosides is related to their ability to act as "decoy acceptors" of xylosylprotein 4-β-galactosyltransferase, we have heterologously expressed the catalytic domain of the human β-1,4-GalT 7 and studied the ability of a variety of synthetic xylopyranoside derivatives to act as substrates or inhibitors of the recombinant enzyme.

Synthesis and evaluation of xylopyranoside derivatives as “decoy acceptors” of human β-1,4-galactosyltransferase 7