Design, synthesis and microbiological evaluation of ampicillin–tetramic acid hybrid antibiotics
作者:Philip T Cherian、Aditi Deshpande、Martin N Cheramie、David F Bruhn、Julian G Hurdle、Richard E Lee
DOI:10.1038/ja.2016.52
日期:2017.1
activities of the hybrids improved in the presence of clavulanic acid revealing that the tetramic acid moiety did not provide added protection against β-lactamases. In addition, the hybrids were found to be efflux pump substrates as their activities markedly improved against pump-inactivated strains. Unlike the catechol and hydroxamic acid siderophore β-lactam conjugates, the activities of the hybrids did not
通过将β-内酰胺抗生素与铁螯合剂(例如儿茶酚和异羟肟酸)结合来利用铁吸收途径是克服革兰氏阴性细菌中与通透性相关的抗性的行之有效的策略。由于先前尚未为此目的检查过天然存在的铁螯合的四酸,因此设计并合成了一系列探索性新结构的氨苄青霉素-四酸杂种,这些杂物在结构上与尿嘧啶青霉素相似。针对具有代表性的临床上重要的细菌病原体,评估了新的类似物的螯合铁的能力及其MIC活性。tetra酸β-内酰胺杂化物表现出对铁的高亲和力,约为10 -30 M 3。杂种对革兰氏阳性细菌的活性较低。然而,针对革兰氏阴性细菌,它们的活性是依赖于物种的,与几种杂种相比,杂种表现出比氨苄西林更高的针对野生型铜绿假单胞菌的活性。在棒酸存在下,杂种的抗-Gram负活性得到了改善,这表明tetra酸部分并未提供针对β-内酰胺酶的额外保护作用。此外,发现杂种是外排泵底物,因为它们的活性明显增强,可抵抗泵灭活的菌株。与邻苯二酚和异羟肟酸