Design and Synthesis of Amphiphilic Xanthone-Based, Membrane-Targeting Antimicrobials with Improved Membrane Selectivity
作者:Hanxun Zou、Jun-Jie Koh、Jianguo Li、Shengxiang Qiu、Thet Tun Aung、Huifen Lin、Rajamani Lakshminarayanan、Xiaoping Dai、Charles Tang、Fang Hui Lim、Lei Zhou、Ai Ling Tan、Chandra Verma、Donald T. H. Tan、Hardy Sze On Chan、Padmanabhan Saraswathi、Derong Cao、Shouping Liu、Roger W. Beuerman
DOI:10.1021/jm301683j
日期:2013.3.28
This work describes how to tune the amphiphilic conformation of α-mangostin, a natural compound that contains a hydrophobic xanthone scaffold, to improve its antimicrobial activity and selectivity for Gram-positive bacteria. A series of xanthone derivatives was obtained by cationic modification of the free C3 and C6 hydroxyl groups of α-mangostin with amine groups of different pKa values. Modified
这项工作描述了如何调节α-芒果的两亲构象,α-芒果是一种天然化合物,含有疏水性的蒽酮骨架,以提高其抗菌活性和对革兰氏阳性细菌的选择性。通过用不同p K a值的胺基对α-芒果的游离C3和C6羟基进行阳离子修饰,获得了一系列的an吨酮衍生物。使用具有高p K a值的部分(例如AM-0016(3b))修饰的结构表现出对革兰氏阳性细菌的有效抗菌性能。化合物3b也可迅速杀死细菌而不会引起耐药性,局部使用时无毒。生物物理研究和分子动力学模拟表明,3b靶向细菌内膜,在疏水-水界面形成两亲构象。相反,具有低p K a值的部分在与the吨酮骨架偶联时降低了母体化合物的抗微生物活性。该策略为改善针对耐药性病原体的膜活性抗生素的开发提供了新的途径。