Rational design and synthesis of new quorum-sensing inhibitors derived from acylated homoserine lactones and natural products from garlic
作者:Tobias Persson、Thomas H. Hansen、Thomas B. Rasmussen、Mette E. Skindersø、Michael Givskov、John Nielsen
DOI:10.1039/b415761c
日期:——
Parallel solution-phase synthesis of sulfide AHL analogues (10a–s) by one-pot or a sequential approach is reported. The corresponding sulfoxides 13a–e and sulfones 14a–e were prepared to expand the diversity of the 19-member array of sulfides 10a–s. Likewise, dithianes 12a–c were prepared with similarity both to sulfides 10a–s and to bioactive structures from garlic. Design and biological screening of all compounds presented in this work targeted inhibition of quorum-sensing comprising competitive inhibition of transcriptional regulators LuxR and LasR. The design was based on critical interactions within the binding-site and structural motifs in molecular components isolated from garlic, 7 and 8, shown to be quorum-sensing inhibitors but not antibiotics. A potent quorum-sensing inhibitor N-(heptylsulfanylacetyl)-L-homoserine lactone (10c) was identified. Together with data collected for the other analogues, the resulting structure–activity relationship led to a hypothesis in which competitive binding was assumed.
报道了一种通过一锅法或连续方法实现的并行解决相合成硫化物AHL类似物(10a–s)。相应的亚砜13a–e和亚磺酸14a–e被制备,以扩展19个成员的硫化物阵列10a–s的多样性。同样,二硫烷12a–c的制备在结构上既与硫化物10a–s相似,也与大蒜中的生物活性结构相似。本研究中所有化合物的设计和生物筛选旨在抑制群体感应,其中包括对转录调节因子LuxR和LasR的竞争性抑制。设计基于从大蒜中分离出的分子组分中的结合位点和结构特征内的关键相互作用,这些组分7和8已被证明是群体感应抑制剂,但不是抗生素。识别出一种有效的群体感应抑制剂N-(庚基硫酰乙酰)-L-同型半胱氨酸内酯(10c)。结合对其他类似物收集的数据,结果的结构-活性关系提出了一个假设,即假定存在竞争性结合。