The Inhibition of Liposaccharide Heptosyltransferase WaaC with Multivalent Glycosylated Fullerenes: A New Mode of Glycosyltransferase Inhibition
作者:Maxime Durka、Kevin Buffet、Julien Iehl、Michel Holler、Jean-François Nierengarten、Stéphane P. Vincent
DOI:10.1002/chem.201102052
日期:2012.1.9
(L‐glycero‐D‐manno‐heptopyranoses) are found in important bacterial glycolipids such as lipopolysaccharide (LPS), the biosynthesis of which is targeted for the development of novel antibacterial agents. This work describes the synthesis of a series of fullerene hexa‐adducts bearing 12 copies of peripheral sugars displaying the mannopyranose core structure of bacterial l,d‐heptoside. The multimers were assembled
在重要的细菌糖脂(例如脂多糖(LPS))中发现了l,d-庚糖苷(L-甘油-D-甘露聚糖-庚糖),其生物合成旨在开发新型抗菌剂。这项工作描述了一系列富勒烯六加合物的合成,这些加合物带有12个拷贝的外围糖,显示了细菌l,d-庚酮的甘露吡喃糖核心结构。最后一步是通过有效的铜催化炔烃-叠氮化物环加成反应组装多聚体。将最终的富勒烯糖球作为庚基转移酶WaaC的抑制剂进行分析,该糖基转移酶催化第一个L的掺入将庚糖转化为LPS。有趣的是,最终分子的抑制在低微摩尔范围被发现(IC 50 = 7-45μ中号),而相应的单体苷显示高微摩尔至毫摩尔低抑制水平(IC 50总是高于400μ中号)。当以“每糖”为基础进行评估时,这些抑制数据表明,在每种情况下,富勒烯的一个糖苷对WaaC的平均亲和力在以多聚体形式显示时均得到显着增强,从而证明了意想不到的多价效应。迄今为止,从未用糖基转移酶证实过这种多价抑制方式。