Herein, 15 phenylpiperazine 3-benzyl-5,5-dimethylhydantoin derivatives (1–15) were screened for modulatory activity towards Msr(A) efflux pump present in S. epidermidis bacteria. Synthesis, crystallographic analysis, biological studies in vitro and structure–activity relationship (SAR) analysis were performed. The efflux pump inhibitory (EPI) potency was determined by employing ethidium bromide accumulation assay in both Msr(A) efflux pump overexpressed (K/14/1345) and deficient (ATCC 12228) S. epidermidis strains. The series of compounds was also evaluated for the capacity to reduce the resistance of K/14/1345 strain to erythromycin, a known substrate of Msr(A). The study identified five strong modulators for Msr(A) in S. epidermidis. The 2,4-dichlorobenzyl-hydantoin derivative 9 was found as the most potent EPI, inhibiting the efflux activity in K/14/1345 at a concentration as low as 15.63 µM. Crystallography-supported SAR analysis indicated structural properties that may be responsible for the activity found. This study identified the first synthetic compounds able to inhibit Msr(A) efflux pump transporter in S. epidermidis. Thus, the hydantoin-derived molecules found can be an attractive group in search for antibiotic adjuvants acting via Msr(A) transporter.
在这里,筛选了15种苯基
哌嗪3-苄基-5,5-二甲基
异噁唑啉衍
生物(1-15),用于调节存在于表皮葡萄球菌细菌中的Msr(A)外流泵的活性。进行了合成、晶体学分析、体外
生物学研究以及结构-活性关系(
SAR)分析。利用
溴化乙锭积累实验确定了外流泵抑制(E
PI)活性,分别在过度表达(K/14/1345)和缺失(A
TCC 12228)的S. e
PIdermidis菌株中。该系列化合物还评估了降低K/14/1345菌株对
红霉素(Msr(A)已知底物)抗性的能力。研究确定了5种对S. e
PIdermidis中的Msr(A)具有强效调节作用的化合物。2,4-二
氯苄基-
噁唑啉衍
生物9被发现是最有效的E
PI,以低至15.63 µM的浓度抑制了K/14/1345中的外流活性。晶体学支持的
SAR分析指出可能负责所发现活性的结构特性。这项研究确定了第一批能够抑制S. e
PIdermidis中Msr(A)外流泵转运蛋白的合成化合物。因此,所发现的
噁唑啉衍生分子可能是寻找通过Msr(A)转运蛋白作用的抗生素辅助剂的有吸引力的组合。