Structural and Functional Characterization of the Enantiomers of the Antischistosomal Drug Oxamniquine
作者:Alexander B. Taylor、Livia Pica-Mattoccia、Chiara M. Polcaro、Enrica Donati、Xiaohang Cao、Annalisa Basso、Alessandra Guidi、Anastasia R. Rugel、Stephen P. Holloway、Timothy J. C. Anderson、P. John Hart、Donato Cioli、Philip T. LoVerde
DOI:10.1371/journal.pntd.0004132
日期:——
the OXA enantiomers using chromatographic methods and assign their optical activities as dextrorotary [(+)-OXA] or levorotary [(-)-OXA]. Crystal structures of the parasite enzyme in complex with optically pure (+)-OXA and (-)-OXA) reveal their absolute configurations as S- and R-, respectively. When tested in vitro, S-OXA demonstrated the bulk of schistosomicidal activity, while R-OXA had antischistosomal
背景技术在过去的二十多年中,向曼氏血吸虫感染的患者施用了奥沙尼喹的消旋混合物(OXA),但是尚不清楚一种或两种对映异构体是否发挥抗血吸虫病的活性。最近,已确定〜30 kDa的曼氏曼陀罗磺基转移酶(SmSULT)是OXA作用的靶标。方法学/主要发现在这里,我们使用色谱方法分离OXA对映异构体,并将其旋光活性指定为右旋[[+]-OXA]或左旋[[-]-OXA]。与光学纯的(+)-OXA和(-)-OXA)复合的寄生虫酶的晶体结构分别显示出其绝对构型为S-和R-。当在体外测试时,S-OXA表现出大量的血吸虫杀虫活性,而R-OXA当以相对较高的浓度存在时具有抗血吸虫病的作用。晶体结构R-OXA•SmSULT和S-OXA•SmSULT配合物揭示了OXA结合方式的相似性,但在暴露于外消旋OXA的酶结构中仅观察到S-OXA对映异构体。结论/意义数据共同表明,S-OXA的较高的血吸虫杀虫活性与其克服R-OX