3D-QSAR Study on the Inhibitory Activity of Flavonoids on PIM-1 Kinase

20 Typical flavonoids were selected for study on the interaction between them and PIM-1 kinase with the comparative molecular field analysis method（CoMFA） as well as the comparative molecular similarity index analysis method（CoMSIA） based on molecule docking.3D-QSAR models between these flavonoids and receptor PIM-1 kinase were established.The obtained optimal cross-validation correlation coefficient Q2 for CoMFA model was 0.582,and the non-cross-validation correlation coefficient R2 was 0.955;the corresponding values for CoMSIA model were 0.790 and 0.974,respectively.These two models showed fairly fine stability and predictive ability.In addition,molecule docking results revealed the key residues in the receptor cavity and their specific action ways with flavonoids.

3-取代苄氧基-6-取代氨基哒嗪衍生物的合成及其除草活性

通过3-取代苄氧基-6-氟哒嗪在75～80℃与二甲胺的绝对无水乙醇溶液封管反应,或在回流条件下分别与吗啡啉或哌啶反应,合成一系列新颖的3-取代苄氧基-6-取代氨基哒嗪类化合物,它们的结构均经IR,1HNMR和元素分析确证.初步的除草活性测定结果表明,该类化合物具有一定的除草活性,讨论了它们的结构与除草活性的关系.

Synthesis, Biological Activity and 3D-QSAR Study of Novel Pyrrolidine-2,4-dione Derivatives Containing N-Substituted Phenylhydrazine Moiety

Twenty-seven novel pyrrolidine-2,4-dione derivatives containing N-substituted phenylhydrazine moiety were synthesized. Their structures were confirmed by IH NMR, 13C NMR and MS. The half effective concentration （ECs0） values of the title compounds against the phytopathogenic fungi Rhizoctonia cerealis were evaluated. Com- pounds 61 and 6q displayed good bioactivity with EC50 values of 1.626 and 2.043 μg/mL, respectively. The 3D quantitative structure activity relationship（3D-QSAR） model of CoMFA was established with reliable cross-validated correlation coefficient q2 value of 0.585 and Noncross-validated correlation coefficient r2 value of 0.971. This model provided a tool for guiding further design and synthesis of novel pyrrolidine-2,4-dione derivatives with high fungicidal activity.

3D-QSAR studies on glycogen phosphorylase inhibitors by flexible comparative molecular field analysis

Canceling grids accommodating probes in comparative molecular field analysis (CoMFA), the idea of flexibleness is introduced into the CoMFA, and in combination with swarm intelligent algorithm which attempts to optimize distributions of diverse probes around drug molecules, a new 3D-QSAR method is proposed in this context as flexible comparative molecular field analysis (FCoMFA). In preliminary at-tempts to performing QSAR studies on 47 glycogen phosphorylase inhibitors, FCoMFA is employed and confirmed to be potent to exploring ligand-receptor interaction manners at active positions and thus to generating stable and predictable models. Simultaneously by an intuitive graphics regarding probe distribution patterns, impacts of different substituted groups on activities is also given an insight into.

STAT3抑制剂及其抗肿瘤活性研究进展

信号转导和转录激活因子3(STAT3)为细胞内重要的信号转导蛋白,与肿瘤的发生发展密切相关,抑制STAT3的过度的表达为治疗肿瘤的手段之一。分别从肽和拟肽类、天然产物类以及虚拟筛选技术发现的小分子这几个方面对目前已报道的STAT3抑制剂的抗肿瘤活性及其构效关系的研究进展进行综述。

含偕二甲基环丙烷结构的1,3,4-噻二唑-脲化合物的合成、抑菌活性及分子对接研究

为了寻找以天然可再生资源为基础的杀菌剂,设计并合成了18个新型含偕二甲基环丙烷结构的1,3,4-噻二唑-脲化合物.在质量浓度为50 mg/L时,初步测定了目标化合物对6种植物病原菌的抑菌活性.结果表明,(+)-顺-1-(4-溴苯基)-3-{5-[(2,2-二甲基-3-丙基环丙基)甲基]-1,3,4-噻二唑-2-基}脲(7i)对西瓜炭疽病菌、玉米小斑病菌和番茄早疫病菌的抑制率分别为91.2%、85.0%和60.1%,均高于阳性对照百菌清.此外,采用比较分子力场分析法(Co MFA)建立了一个合理有效的三维定量构效关系(3D-QSAR)模型(r^(2)=0.990,q^(2)=0.517);通过分子对接探究了目标化合物与琥珀酸脱氢酶之间的作用模式,并定量分析了其中关键的Arg残基与苯环之间的阳离子-π相互作用;前线分子轨道计算表明目标化合物中的偕二甲基环丙烷以及噻二唑-脲-苯结构可能对抑菌活性起主要贡献.