Synthesis and evaluation of xylopyranoside derivatives as “decoy acceptors” of human β-1,4-galactosyltransferase 7
作者:Juan Francisco García-García、Guillermo Corrales、Josefina Casas、Alfonso Fernández-Mayoralas、Eduardo García-Junceda
DOI:10.1039/c0mb00206b
日期:——
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 âdecoy acceptorsâ 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.
包括硫酸乙酰肝素在内的蛋白聚糖(PGs)是肿瘤进展的重要调控因子。在PGs的生物合成过程中,核心蛋白在核糖体模板上合成,糖链则是翻译后逐个糖基化组装而成,起始于木糖与核心蛋白丝氨酸残基的连接,随后是木糖蛋白的半乳糖基化。此前研究表明,疏水的木糖吡喃糖苷能启动硫酸乙酰肝素的合成,这一特性对于诱导肿瘤细胞生长抑制是必需的。为了了解合成木糖吡喃糖苷的抗增殖活性是否与其作为木糖蛋白4-β-半乳糖基转移酶的“诱饵受体”的能力有关,我们异源表达了人β-1,4-半乳糖基转移酶7的催化结构域,并研究了多种合成木糖吡喃糖苷衍生物作为重组酶底物或抑制剂的能力。