细菌包膜的结构是导致革兰氏阴性细菌抗性的主要因素之一。为了开发靶向细菌膜的新试剂,我们类似于我们之前的肽偶联物,合成了新的两亲性3',4',6-三萘甲基亚甲基胺,其在第5位通过一个短间隔基被一个螯合基tris(2-吡啶甲基)胺(TPA)和二(吡啶甲基)胺(DPA)和四氮杂环十四烷(Cyclam)。ESI +质谱分析表明,在用于抗菌测定的Mueller Hinton(MH)培养基中,Zn(II)(NeaDPA)和Cu(II)(NeaCyclam)均不稳定。相反,Zn(NeaTPA)在MH培养基中稳定。有趣的是,在MH中,发现游离配体NeaTPA与锌结合,锌盐是该培养基中最丰富的盐。因此,所有化合物的抗菌活性均被评估为针对大肠杆菌菌株,野生型AG100和产气大肠杆菌EA289(过表达AcrAB-TolC外排泵的临床MDR菌株)以及AG100A(针对AcrAB-大肠杆菌的菌株)的游离配体。 EA
New Peptide-Based Antimicrobials for Tackling Drug Resistance in Bacteria: Single-Cell Fluorescence Imaging
摘要:
New peptide molecules with metal binding :abilities proved to he active against multidrug resistant clinical isolates. One of them, labeled with a dansylated lysine has been imaged inside single-multidrug resistant bacteria cells by deep ultraviolet fluorescence, showing a heterogeneous Subcellular localization. The fluorescence intensity is clearly related to the accumulation of the drug inside the bacteria, being dependent both on its concentration and on the incubation time with cells.