Antibiotic resistance is one of the main public health concerns of this century. This resistance is also associated with oxidative stress, which could contribute to the selection of resistant bacterial strains. Bearing this in mind, and considering that flavonoid compounds are well known for displaying both activities, we investigated a series of hydroxy-3-arylcoumarins with structural features of flavonoids for their antibacterial activity against different bacterial strains. Active compounds showed selectivity against the studied Gram-positive bacteria compared to Gram-negative bacteria. 5,7-Dihydroxy-3-phenylcoumarin (compound 8) displayed the best antibacterial activity against Staphylococcus aureus and Bacillus cereus with minimum inhibitory concentrations (MICs) of 11 g/mL, followed by Staphylococcus aureus (MRSA strain) and Listeria monocytogenes with MICs of 22 and 44 g/mL, respectively. Moreover, molecular docking studies performed on the most active compounds against Staphylococcus aureus tyrosyl-tRNA synthetase and topoisomerase II DNA gyrase revealed the potential binding mode of the ligands to the site of the appropriate targets. Preliminary structure–activity relationship studies showed that the antibacterial activity can be modulated by the presence of the 3-phenyl ring and by the position of the hydroxyl groups at the coumarin scaffold.
抗生素耐药性是本世纪主要的公共卫生关注点之一。这种耐药性也与
氧化应激有关,可能有助于选择耐药性细菌菌株。考虑到这一点,并且考虑到
黄酮类化合物以展示这两种活性而闻名,我们研究了一系列具有黄
酮类结构特征的羟基-3-芳基
香豆素对不同细菌菌株的抗菌活性。活性化合物对所研究的革兰氏阳性细菌表现出了选择性,而不同于革兰氏阴性细菌。5,7-二羟基-3-
苯基
香豆素(化合物8)对
金黄色葡萄球菌和蜡样芽孢杆菌显示出最佳的抗菌活性,最小抑制浓度(MICs)分别为11 g/mL,其次是
金黄色葡萄球菌(M
RSA菌株)和李斯特菌属,MICs分别为22和44 g/mL。此外,对
金黄色葡萄球菌酪
氨酰-tRNA
合成酶和DNA旋转酶II的最活性化合物进行的分子对接研究揭示了
配体与适当靶点位点的潜在结合方式。初步的结构-活性关系研究显示,3-
苯基环的存在和
香豆素骨架上羟基团的位置可以调节抗菌活性。