引用本文:
【打印本页】   【HTML】   【下载PDF全文】   View/Add Comment  【EndNote】   【RefMan】   【BibTex】
←前一篇|后一篇→ 过刊浏览    高级检索
本文已被:浏览 1548次   下载 1348 本文二维码信息
码上扫一扫!
分享到: 微信 更多
Electronic Structures, DNA-binding, SAR, and Spectral Properties of Ruthenium Methylimidazole Complexes [Ru(MeIm)4L]2+ (L=iip, tip, 2ntz)
Guo-dong Li1, Lan-mei Chen1, Xin-yu Wang2, Ling-feng Wu2, Xin-ming Jie3, Jin-can Chen*3
1.School of Pharmacy, Guangdong Medical College, Zhanjiang 524023, China;2.The First Clinical Medical College, Guangdong Medical College, Zhanjiang 524023, China;3.Analysis Centre of Guangdong Medical College, Zhanjiang 524023, China
Abstract:
Theoretical studies on the electronic and geometric structures, the trend in DNA-binding affinities as well as the the structure-activity relationship (SAR) of a series of water-soluble Ru(II) methylimidazole complexes, i.e. [Ru(MeIm)4iip]2+ (1) (MeIm=1-methylimidazole, iip=2-(1H-imidazo-4-group)-1H-imidazo[4,5-f][1,10]phenanthroline), [Ru(MeIm)4tip]2+ (2) (tip=2-(thiophene-2-group)-1H-imidazo[4,5-f][1,10]phenanthroline), and [Ru(MeIm)42ntz]2+ (3) (2ntz=2-(2-nitro-1,3-thiazole-5-group)-1H-imidazo[4,5-f][1,10]phenanthroline), were car-ried out using the density functional theory (DFT). The electronic structures of these Ru(II) complexes were analyzed on the basis of their geometric structures optimized in aqueous solution, and the trend in the DNA-binding constants (Kb) was reasonably explained. The results show that the replacement of imidazole ligand by thiophene ligand can effectively improve the DNA-binding affinity of the complex. Meanwhile, it was found that introduc-ing the stronger electronegative N atom and NO2 group on terminal loop of intercalative ligand can obviously reduce the complex's LUMO and HOMO-LUMO gap energies. Based on these findings, the designed complex [Ru(MeIm)42ntz]2+ (3) can be expected to have the greatest Kb value in complexes 1-3. In addition, the structure-activity relationships and antitumor mechanism were also carefully discussed, and the antimetastatic activity of the designed complex 3 was predicted. Finally, the electronic absorption spectra of this series of complexes in aqueous solution were calculated, simulated and assigned using DFT/TDDFT methods as well as conductor-like polarizable continuum model (CPCM), and were in good agreement with the experimental results.
Key words:  Ruthenium methylimidazole complex, DNA-binding, Structure-activity rela-tionships, Spectral property, DFT calculation
FundProject:
[Ru(MeIm)4L]2+ (L=iip, tip, 2ntz)的电子结构、DNA-键合、构效关系及光谱特征
李国栋1, 陈兰美*1, 王忻宇2, 巫玲凤2, 揭新明3, 陈锦灿*3
1.广东医学院药学院,湛江524023;2.广东医学院第一临床医学院,湛江524023;3.广东医学院分析中心,湛江524023
摘要:
采用密度泛函的方法,结合导体极化连续模型研究了水溶性二价钌-甲基咪唑类配合物[Ru(MeIm)4iip]2+ (1)、[Ru(MeIm)4tip]2+(2)和[Ru(MeIm)42ntz]2+ (3)的电子结构、DNA的键合倾向及构效关系.在水溶液中几何优化的基础上分析了配合物的电子结构特征,并合理解释了配合物与DNA的键合倾向.计算结果表明,在主配体上用噻吩代替咪唑取代基可以有效提高配合物与DNA的键合力;同时,在主配体的骨架上引入强电负性的N原子及NO2基团可以明显降低配合物最低未占据分子轨道能量及前沿分子轨道能量差.基于以上计算结果,预测所设计的配合物3具有最大的DNA键合力常数.另外,详细分析了配合物1、2的构效关系及抗肿瘤作用机理,并预测了配合物3的抗肿瘤活性.最后,用含时密度泛函方法对配合物的电子吸收光谱进行了计算和模拟,并与实验结果进行了对比分析.
关键词:  钌甲基咪唑配合物,DNA键合,构效关系,光谱特征,密度泛函理论
DOI:10.1063/1674-0068/27/02/159-167
分类号: