Boronic ester-linked macrocyclic lipopeptides as serine protease inhibitors targeting Escherichia coli type I signal peptidase
作者:Natalia Szałaj、Lu Lu、Andrea Benediktsdottir、Edouard Zamaratski、Sha Cao、Gustav Olanders、Charles Hedgecock、Anders Karlén、Máté Erdélyi、Diarmaid Hughes、Sherry L. Mowbray、Peter Brandt
DOI:10.1016/j.ejmech.2018.08.086
日期:2018.9
Type I signal peptidase, with its vital role in bacterial viability, is a promising but underexploited antibacterial drug target. In the light of steadily increasing rates of antimicrobial resistance, we have developed novel macrocyclic lipopeptides, linking P2 and P1′ by a boronic ester warhead, capable of inhibiting Escherichia coli type I signal peptidase (EcLepB) and exhibiting good antibacterial
I型信号肽酶在细菌生存能力中起着至关重要的作用,是一种有前途但未充分利用的抗菌药物靶标。鉴于抗菌药耐药率的稳定增长,我们开发了一种新型的大环脂肽,通过硼酸酯战斗部连接P2和P1',能够抑制大肠杆菌I型信号肽酶(Ec LepB)并表现出良好的抗菌活性。大环环,肽序列和亲脂性尾巴的结构修饰使我们得到了14种新颖的大环硼酸酯。这可以表明,大环来讲是很好的耐受性的EcLepB抑制和抗菌活性。在合成的大环化合物中, 鉴定出低纳摩尔范围的有效酶抑制剂(例如化合物42f,Ec LepB IC 50 = 29 nM)也显示出良好的抗菌活性(例如化合物42b,大肠杆菌WT MIC = 16μg/ mL)。这里描述的独特的大环硼酸酯是基于以前发表的线性脂肽EcLepB抑制剂试图解决细胞毒性和溶血作用。我们在本文中显示,大环的结构变化会影响细胞毒性和溶血活性,这表明P2至P1'接头提供了优化脱靶效应的手段。然而