In search of natural renewable resource-based bioactive molecules,20 hydroxamate inhibitors were designed and synthesized using cinamaldehyde as the starting material.Their structures were characterized by FT-IR,^(1)H...In search of natural renewable resource-based bioactive molecules,20 hydroxamate inhibitors were designed and synthesized using cinamaldehyde as the starting material.Their structures were characterized by FT-IR,^(1)HNMR,^(13)C NMR,and HRMS.And in vitro antifungal activity of the target compounds against 8 tested fungi was preliminarily evaluated by the agar dilution method.The bioassay results revealed that at the concentration of 50 mg/L,the target compounds exhibited certain inhibitory activity against 8 tested fungi,in which compounds 5r(R=o,o-Cl),5c(R=m-F),5b(R=o-F)and 5p(R=o,p-Cl)displayed better inhibitory activity of 93.3%,76.8%,75.3%and 72.3%,respectively,against P.piricola than that of the positive control chlorothalonil.At the same time,3D-quantitative structure-activity relationship(3D-QSAR)study was carried out to explore the relationship of the molecular structures with their antifungal activity against P.piricola.And a reasonable and effective 3D-QSAR model(r^(2)=0.980,q^(2)=0.501)has been established.Besides,molecular docking was also performed to reveal the binding mode of the target compound 5r(R=o,o-Cl)with succinate dehydrogenase(SDH).It was found that compound 5r could be well embedded in the active pocket of the receptor protein.This showed a similar mode with SDH inhibitors(SDHI)carboxin.展开更多
文摘In search of natural renewable resource-based bioactive molecules,20 hydroxamate inhibitors were designed and synthesized using cinamaldehyde as the starting material.Their structures were characterized by FT-IR,^(1)HNMR,^(13)C NMR,and HRMS.And in vitro antifungal activity of the target compounds against 8 tested fungi was preliminarily evaluated by the agar dilution method.The bioassay results revealed that at the concentration of 50 mg/L,the target compounds exhibited certain inhibitory activity against 8 tested fungi,in which compounds 5r(R=o,o-Cl),5c(R=m-F),5b(R=o-F)and 5p(R=o,p-Cl)displayed better inhibitory activity of 93.3%,76.8%,75.3%and 72.3%,respectively,against P.piricola than that of the positive control chlorothalonil.At the same time,3D-quantitative structure-activity relationship(3D-QSAR)study was carried out to explore the relationship of the molecular structures with their antifungal activity against P.piricola.And a reasonable and effective 3D-QSAR model(r^(2)=0.980,q^(2)=0.501)has been established.Besides,molecular docking was also performed to reveal the binding mode of the target compound 5r(R=o,o-Cl)with succinate dehydrogenase(SDH).It was found that compound 5r could be well embedded in the active pocket of the receptor protein.This showed a similar mode with SDH inhibitors(SDHI)carboxin.
文摘以间甲氧基肉桂酸、对位取代的苯甲醛为原料,设计合成了2种未见报道的肉桂酸肟酯类衍生物,并用MS、IR、1H NMR、13C NMR进行结构表征。采用分子对接技术和荧光光谱法、紫外-可见光谱法、位点竞争法研究了2种衍生物分别和人血清白蛋白(HSA)相结合的机理。通过Stern-Volmer方程等处理荧光猝灭相关数据得到了衍生物与HSA相互作用的结合常数和热力学参数。结合紫外-可见光谱对两种衍生物与HSA的相互作用进行了进一步的分析,结果表明在体外生理条件下,衍生物都可以与HSA结合,对HSA内源荧光产生静态猝灭并对其构象产生影响,其主要的结合力为氢键和范德华力。位点竞争实验表明衍生物与HSA相互作用都发生在Sudlow site 1(亚域ⅡA)处。以上实验结果均验证了分子模拟对实验的预测。
