Cationic and non-peptide small molecules containing a total of six positive charges arranged on one side and a long aliphatic tail on the other have been synthesized and tested against Gram-positive and Gram-negative bacteria. The positive charges have been contributed by two aminophenol residues. These molecules have showed remarkable antimicrobial activity against Gram-positive bacteria including multidrug-resistant strains. Our structure–activity relationship studies demonstrated the importance of the length and flexibility of the hydrophobic tail for the antimicrobial activity. Importantly, these compounds are non-toxic to eukaryotic cells at the concentration affecting growth in bacteria, reflecting an acceptable margin of safety. The small size and easy synthetic accessibility of our molecules can be of interest for the further development of novel antimicrobials against Gram-positive bacterial pathogens, including multidrug-resistant strains.
我们已经合成了含有六个正电荷的阳离子非肽小分子,这些正电荷分布在一侧,而另一侧则是一个长链脂肪族尾部,并对它们进行了针对革兰氏阳性菌和革兰氏阴性菌的测试。这些正电荷由两个
氨基
酚残基贡献。这些分子显示出对包括多药耐药菌株在内的革兰氏阳性菌具有显著的抗菌活性。我们的构效关系研究表明,疏
水尾部的长度和柔韧性对抗菌活性至关重要。重要的是,这些化合物在影响细菌生长的浓度下对真核细胞无毒,反映了可接受的安全边际。我们分子的小尺寸和易于合成的特点对于进一步开发针对包括多药耐药菌株在内的革兰氏阳性细菌病原体的新型抗菌剂具有潜在的兴趣。