In the past decade,the p53-MDM2 protein-protein interaction by small molecules has been confirmed as a successful strategy for cancer therapy.In our previous work,pyrrolo[3,4-c]pyrazol-6（1H）-ones were found to be po...In the past decade,the p53-MDM2 protein-protein interaction by small molecules has been confirmed as a successful strategy for cancer therapy.In our previous work,pyrrolo[3,4-c]pyrazol-6（1H）-ones were found to be potent p53-MDM2 inhibitors.Further optimization and structure-activity relationship studies were described in the present work.The result revealed that benzyl group on position N1 of imidazole and bromine on C4-phenyl of pyrrolidone showed higher inhibitory activities.In vitro antiproliferative assay demonstrated the potent p53-MDM2 inhibitor 5c with 4-fold selectivity for U2 OS and Saos-2 cells.These data indicated that 4,5-dihydropyrrolo[3,4-c]pyrazol-6（1H）-one moiety is a valuable scaffold for further development of p53-MDM2 inhibitors.展开更多
Mycobacterium tuberculosis FabH, an essential enzyme in mycolic acids biosynthetic pathway, is an attractive target for novel anti-tuberculosis agents. Structure-based design, synthesis of novel inhibitors of mtFabH w...Mycobacterium tuberculosis FabH, an essential enzyme in mycolic acids biosynthetic pathway, is an attractive target for novel anti-tuberculosis agents. Structure-based design, synthesis of novel inhibitors of mtFabH was reported in this paper. A novel scaffold structure was designed, and 12 candidate compounds that displayed favorable binding with the active site were identified and synthesized. 2009 Song Li. Published by Elsevier B.V. on behalf of Chinese Chemical Society. All rights reserved.展开更多
Oleanolic acid derivatives act as newer protein tyrosine phosphatase 1B （PTP-1B） inhibitors for type 2 diabetes mellitus （T2DM）. In order to understand the structural requirement of PTP-1B inhibitors, 52 oleanolic...Oleanolic acid derivatives act as newer protein tyrosine phosphatase 1B （PTP-1B） inhibitors for type 2 diabetes mellitus （T2DM）. In order to understand the structural requirement of PTP-1B inhibitors, 52 oleanolic acid derivatives were divided into a training set （34 compounds） and a test set （18 compounds）. The highly reliable and predictive 3D-QSAR models were constructed by CoMFA, CoMSIA and topomer CoMFA methods, respectively. The results showed that the cross validated coefficient （q2） and non-cross-validated coefficient （R2） were 0.554 and 0.999 in the CoMFA model, 0.675 and 0.971 in the CoMSIA model, and 0.628 and 0.939 in the topomer CoMFA model, which suggests that three models are robust and have good exterior predictive capabilities. Furthermore, ten novel inhibitors with much higher inhibitory potency were designed. Our design strategy was that （i） the electronegative substituents （Cl, -CH2OH, OH and -CH2Cl） were introduced into the double bond of ring C, （ii） the hydrogen bond acceptor groups （C≡N and N atom）, electronegative groups （C≡N, N atom, -COOH and -COOCH3） and bulky substituents （C6H5N） were connected to the C-3 position, which would result in generating potent and selective PTP-1B inhibitors. We expect that the results in this paper have the potential to facilitate the process of design and to develop new potent PTP-1B inhibitors.展开更多
In this work, 25 3-O-β-chacotriosyl ursolic acid derivatives were employed to achieve the highly reliable and predictive 3 D-QSAR models by Co MFA and Co MSIA methods, respectively. The predictive capabilities of two...In this work, 25 3-O-β-chacotriosyl ursolic acid derivatives were employed to achieve the highly reliable and predictive 3 D-QSAR models by Co MFA and Co MSIA methods, respectively. The predictive capabilities of two constructed CoMFA and CoMSIA models were verified by the leave-one-out cross-validation method. The results showed that the cross-validated coefficient（q2） and non-cross-validated coefficient（R2） were 0.559, 0.981 in the CoMFA model and 0.696, 0.978 in the CoM SIA model, respectively, which suggests that these two models are robust and have good exterior predictive capabilities. Furthermore, based on the contour maps information of two models, ten novel inhibitors with higher inhibitory potency were designed, and the quantum chemical calculation of density functional theory（DFT） was performed to investigate the mechanism why the designed molecules have stronger inhibitory activity than the lead compound. The calculations show that the C-50 position of lead compound is a key active site for the enhancement of inhibitory activity, and it should be introduced into the large electron withdrawing group, which would result in generating potent and selective H5 N1 entry inhibitors. We expect that the results in this paper could provide important information to develop new potent H5 N1 entry inhibitors.展开更多
Dipeptidyl peptidase Ⅳ（DPP4） inhibitors are proven in the treatment of type 2 diabetes.We designed and synthesized a series of novel indole compounds that selectively inhibit the activity of DPP4 over dipeptidyl pe...Dipeptidyl peptidase Ⅳ（DPP4） inhibitors are proven in the treatment of type 2 diabetes.We designed and synthesized a series of novel indole compounds that selectively inhibit the activity of DPP4 over dipeptidyl peptidase 9（DPP9）（〉200 fold）.We further co-crystallized DPP4 with indole sulfonamide（compound 1） to confirm a proposed binding mode.Good metabolic stability of the indole compounds represents another positive attribute for further development.展开更多
探讨扎那米韦类衍生物对禽流感病毒神经氨酸酶(NA)的抑制作用,为新的NA抑制剂的研发和设计提供有用的结构信息,进而对流感病毒的新药研发产生一定的积极意义.首先,选取22个扎那米韦类的合成化合物为配体,与PDB(protein data bank)数据...探讨扎那米韦类衍生物对禽流感病毒神经氨酸酶(NA)的抑制作用,为新的NA抑制剂的研发和设计提供有用的结构信息,进而对流感病毒的新药研发产生一定的积极意义.首先,选取22个扎那米韦类的合成化合物为配体,与PDB(protein data bank)数据库中下载的3BEQ受体蛋白进行对接.然后,采用CoMFA和CoMSIA方法建立3D-QSAR预测模型,其中,CoMFA和CoMSIA模型的交叉验证系数q^(2)分别为0.599和0.592,非交互验证相关系数R^(2)分别为0.999和0.775,这一结果表明2种模型都具有良好的预测能力.最后,根据对接结果和3D-QSAR模型的预测分析,设计得到2种对禽流感病毒抑制活性更高的分子.展开更多
基金supported in part by the National Natural Science Foundation of China (Nos. 81373331 and 81502978)the Bio-Pharmaceutical Project of Science and Technology of Shanghai (No. 14431902300)Youth grant of Second Military Medical University (No. 2014QN08)
文摘In the past decade,the p53-MDM2 protein-protein interaction by small molecules has been confirmed as a successful strategy for cancer therapy.In our previous work,pyrrolo[3,4-c]pyrazol-6（1H）-ones were found to be potent p53-MDM2 inhibitors.Further optimization and structure-activity relationship studies were described in the present work.The result revealed that benzyl group on position N1 of imidazole and bromine on C4-phenyl of pyrrolidone showed higher inhibitory activities.In vitro antiproliferative assay demonstrated the potent p53-MDM2 inhibitor 5c with 4-fold selectivity for U2 OS and Saos-2 cells.These data indicated that 4,5-dihydropyrrolo[3,4-c]pyrazol-6（1H）-one moiety is a valuable scaffold for further development of p53-MDM2 inhibitors.
基金supported by the National Basic Research Program of China(No.2004CB518908)the National High Technology Research and Development Program of China(No.2006AA020601)
文摘Mycobacterium tuberculosis FabH, an essential enzyme in mycolic acids biosynthetic pathway, is an attractive target for novel anti-tuberculosis agents. Structure-based design, synthesis of novel inhibitors of mtFabH was reported in this paper. A novel scaffold structure was designed, and 12 candidate compounds that displayed favorable binding with the active site were identified and synthesized. 2009 Song Li. Published by Elsevier B.V. on behalf of Chinese Chemical Society. All rights reserved.
基金Supported by the Natural Science Foundation of Guangxi Province(Nos.2013GXNSFAA019019 and 2013GXNSFAA019041)
文摘Oleanolic acid derivatives act as newer protein tyrosine phosphatase 1B （PTP-1B） inhibitors for type 2 diabetes mellitus （T2DM）. In order to understand the structural requirement of PTP-1B inhibitors, 52 oleanolic acid derivatives were divided into a training set （34 compounds） and a test set （18 compounds）. The highly reliable and predictive 3D-QSAR models were constructed by CoMFA, CoMSIA and topomer CoMFA methods, respectively. The results showed that the cross validated coefficient （q2） and non-cross-validated coefficient （R2） were 0.554 and 0.999 in the CoMFA model, 0.675 and 0.971 in the CoMSIA model, and 0.628 and 0.939 in the topomer CoMFA model, which suggests that three models are robust and have good exterior predictive capabilities. Furthermore, ten novel inhibitors with much higher inhibitory potency were designed. Our design strategy was that （i） the electronegative substituents （Cl, -CH2OH, OH and -CH2Cl） were introduced into the double bond of ring C, （ii） the hydrogen bond acceptor groups （C≡N and N atom）, electronegative groups （C≡N, N atom, -COOH and -COOCH3） and bulky substituents （C6H5N） were connected to the C-3 position, which would result in generating potent and selective PTP-1B inhibitors. We expect that the results in this paper have the potential to facilitate the process of design and to develop new potent PTP-1B inhibitors.
基金Supported by the Natural Science Foundation of Guangxi Province(Nos.2013GXNSFAA019019 and 2013GXNSFAA019041)
文摘In this work, 25 3-O-β-chacotriosyl ursolic acid derivatives were employed to achieve the highly reliable and predictive 3 D-QSAR models by Co MFA and Co MSIA methods, respectively. The predictive capabilities of two constructed CoMFA and CoMSIA models were verified by the leave-one-out cross-validation method. The results showed that the cross-validated coefficient（q2） and non-cross-validated coefficient（R2） were 0.559, 0.981 in the CoMFA model and 0.696, 0.978 in the CoM SIA model, respectively, which suggests that these two models are robust and have good exterior predictive capabilities. Furthermore, based on the contour maps information of two models, ten novel inhibitors with higher inhibitory potency were designed, and the quantum chemical calculation of density functional theory（DFT） was performed to investigate the mechanism why the designed molecules have stronger inhibitory activity than the lead compound. The calculations show that the C-50 position of lead compound is a key active site for the enhancement of inhibitory activity, and it should be introduced into the large electron withdrawing group, which would result in generating potent and selective H5 N1 entry inhibitors. We expect that the results in this paper could provide important information to develop new potent H5 N1 entry inhibitors.
基金supported in part by funds from the Ministry of Science and Technology (No. 2014CB910300)the Natural Science Foundation of Zhejiang Province (No. R2100439)the Specialized Research Fund for the Doctoral Program of Higher Education (No. 20110101110122)
文摘Dipeptidyl peptidase Ⅳ（DPP4） inhibitors are proven in the treatment of type 2 diabetes.We designed and synthesized a series of novel indole compounds that selectively inhibit the activity of DPP4 over dipeptidyl peptidase 9（DPP9）（〉200 fold）.We further co-crystallized DPP4 with indole sulfonamide（compound 1） to confirm a proposed binding mode.Good metabolic stability of the indole compounds represents another positive attribute for further development.
文摘探讨扎那米韦类衍生物对禽流感病毒神经氨酸酶(NA)的抑制作用,为新的NA抑制剂的研发和设计提供有用的结构信息,进而对流感病毒的新药研发产生一定的积极意义.首先,选取22个扎那米韦类的合成化合物为配体,与PDB(protein data bank)数据库中下载的3BEQ受体蛋白进行对接.然后,采用CoMFA和CoMSIA方法建立3D-QSAR预测模型,其中,CoMFA和CoMSIA模型的交叉验证系数q^(2)分别为0.599和0.592,非交互验证相关系数R^(2)分别为0.999和0.775,这一结果表明2种模型都具有良好的预测能力.最后,根据对接结果和3D-QSAR模型的预测分析,设计得到2种对禽流感病毒抑制活性更高的分子.
