1.Quantitative Structure Activity Relationship between Diazabicyclo4.2.0octanes Derivatives and Nicotinic Acetylcholine Receptor Agonists.
Eun Ae KIM ; Kyoung Chul JUNG ; Uy Dong SOHN ; Chaeuk IM
The Korean Journal of Physiology and Pharmacology 2009;13(1):55-59
Three dimensional quantitative structure activity relationship between diazabicyclo[4.2.0]octanes and nicotinic acetylcholine receptor (h alpha4beta2 and h alpha3beta4) agonists was studied using comparative molecular field analysis (CoMFA) and comparative molecular similarity indices analysis (CoMSIA). From 11 CoMFA and CoMSIA models, CoMSIA with steric and electrostatic fields gave the best predictive models (q2=0.926 and 0.945, r2(ncv)=0.983 and 0.988). This study can be used to develop potent h alpha4beta2 receptor agonists with low activity on h alpha3beta4 subtype.
Quantitative Structure-Activity Relationship
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Receptors, Nicotinic
2.Applications of QSAR in Toxicological Risk Assessment of Medical Devices.
Xin TANG ; Wenjing ZHAO ; Qing YU
Chinese Journal of Medical Instrumentation 2022;46(2):200-205
The chemical characterization analysis of a medical device often results in chemical substances with unknown toxicities. While identification of each individual toxicity could result in a time-consuming hurdle with tremendous labor and financial burden, quantitative structure-activity relationship (QSAR) is of great significance for toxicity risk assessment of such chemical substances. By establishing quantitative relationship between the molecular structures or active groups of similar chemical compounds with their biological activities, QSAR can be utilized to predict the toxicity of such target compounds with significantly reduced cost and time. In this article, the authors generally summarized the mechanisms of QSAR approaches, current applications of QSAR modeling in the field of medical device, an introduction of the characteristics of publicly and commercially-available QSAR software, and briefly explored future trends of QSAR modeling in medical device toxicological risk assessment. The utilization of QSAR would undoubtedly further advance the toxicological risk assessment of medical devices.
Quantitative Structure-Activity Relationship
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Risk Assessment
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Software
3.Assessment of quantitative structure-activity relationship of toxicity prediction models for Korean chemical substance control legislation.
Kwang Yon KIM ; Seong Eun SHIN ; Kyoung Tai NO
Environmental Health and Toxicology 2015;30(Suppl):s2015007-
OBJECTIVES: For successful adoption of legislation controlling registration and assessment of chemical substances, it is important to obtain sufficient toxicological experimental evidence and other related information. It is also essential to obtain a sufficient number of predicted risk and toxicity results. Particularly, methods used in predicting toxicities of chemical substances during acquisition of required data, ultimately become an economic method for future dealings with new substances. Although the need for such methods is gradually increasing, the-required information about reliability and applicability range has not been systematically provided. METHODS: There are various representative environmental and human toxicity models based on quantitative structure-activity relationships (QSAR). Here, we secured the 10 representative QSAR-based prediction models and its information that can make predictions about substances that are expected to be regulated. We used models that predict and confirm usability of the information expected to be collected and submitted according to the legislation. After collecting and evaluating each predictive model and relevant data, we prepared methods quantifying the scientific validity and reliability, which are essential conditions for using predictive models. RESULTS: We calculated predicted values for the models. Furthermore, we deduced and compared adequacies of the models using the Alternative non-testing method assessed for Registration, Evaluation, Authorization, and Restriction of Chemicals Substances scoring system, and deduced the applicability domains for each model. Additionally, we calculated and compared inclusion rates of substances expected to be regulated, to confirm the applicability. CONCLUSIONS: We evaluated and compared the data, adequacy, and applicability of our selected QSAR-based toxicity prediction models, and included them in a database. Based on this data, we aimed to construct a system that can be used with predicted toxicity results. Furthermore, by presenting the suitability of individual predicted results, we aimed to provide a foundation that could be used in actual assessments and regulations.
Humans
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Quantitative Structure-Activity Relationship*
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Reproducibility of Results
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Social Control, Formal
4.Evaluation of Advanced Structure-Based Virtual Screening Methods for Computer-Aided Drug Discovery.
Hui Sun LEE ; Ji Won CHOI ; Suk Joon YOON
Genomics & Informatics 2007;5(1):24-29
Computational virtual screening has become an essential platform of drug discovery for the efficient identification of active candidates. Moleculardocking, a key technology of receptor-centric virtual screening, is commonly used to predict the binding affinities of chemical compounds on target receptors. Despite the advancement and extensive application of these methods, substantial improvement is still required to increase their accuracy and time-efficiency. Here, we evaluate several advanced structure-based virtual screening approaches for elucidating the rank-order activity of chemical libraries, and the quantitative structureactivity relationship (QSAR). Our results show that the ensemble-average free energy estimation, including implicit solvation energy terms, significantly improves the hit enrichment of the virtual screening. We also demonstrate that the assignment of quantum mechanical-polarized (QM-polarized) partial charges to docked ligands contributes to the reproduction of the crystal pose of ligands in the docking and scoring procedure.
Drug Discovery*
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Ligands
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Mass Screening*
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Quantitative Structure-Activity Relationship
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Reproduction
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Small Molecule Libraries
5.Quantitative structure activity relationship models based on heuristic method and gene expression programming for the prediction of the pK(a) values of sulfa drugs.
Yu-qin LI ; Hong-zong SI ; Yu-liang XIAO ; Cai-hong LIU ; Cheng-cai XIA ; Ke LI ; Yong-xiu QI
Acta Pharmaceutica Sinica 2009;44(5):486-490
Quantitative structure-property relationships (QSPR) were developed to predict the pK(a) values of sulfa drugs via heuristic method (HM) and gene expression programming (GEP). The descriptors of 31 sulfa drugs were calculated by the software CODESSA, which can calculate constitutional, topological, geometrical, electrostatic, and quantum chemical descriptors. HM was also used for the preselection of 4 appropriate molecular descriptors. Linear and nonlinear QSPR models were developed based on the HM and GEP separately and two prediction models lead to a good correlation coefficient (R) of 0.90 and 0.95. The two QSPR models are tseful in predicting pK(a) during the discovery of new drugs and providing theory information for studying the new drugs.
Algorithms
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Gene Expression
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Models, Chemical
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Quantitative Structure-Activity Relationship
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Software
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Sulfonamides
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chemistry
6.Chemical QSAR recognition by using fuzzy min-max neural-network.
Yongwu LI ; Zhiqian YE ; Jinfang LU
Journal of Biomedical Engineering 2002;19(3):449-451
By using the fuzzy min-max neural network, the quantitative structure-activity relationship (QSAR) of mutagenicity is studied. With the established QSAR model, the mutagenicity is predicted and the results showed that QASR is superior to linear-regression model. Further discussion on the models and the results is presented in this paper.
Algorithms
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Cluster Analysis
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Fuzzy Logic
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Models, Chemical
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Neural Networks (Computer)
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Quantitative Structure-Activity Relationship
7.Chemical structural characterization of some components from essential oil of Rosa banksiae for estimation and prediction of their retention time.
Wan-Ping ZHU ; Hu MEI ; Mao SHU ; Li-Min LIAO ; Juan YANG ; Zhi-Liang LI
China Journal of Chinese Materia Medica 2008;33(5):609-611
The molecular electronegativity-distance vector (MEDV) was used to describe the chemical structural characterization of 46 components of essential oils in the flower of Rosa banksiae. Various multiple linear regression (MLR) models were created with variable screening by the stepwise multiple regression technique and statistics. The QSRR models of 10 and 6 variables were built by MLR with the correlation coefficients (R) of molecular modeling being 0.906 and 0.903. Cross-validation of the models, which contain selected vectors were performed by leave-one -out procedure (LOO) and the satisfied results with correlation coefficients (Rcv) of 0.904 and 0.903, respectively. The results showed that the models constructed can provide estimation stability and favorable predictive ability.
Flowers
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chemistry
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Linear Models
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Molecular Structure
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Oils, Volatile
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chemistry
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Plants, Medicinal
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chemistry
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Quantitative Structure-Activity Relationship
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Regression Analysis
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Rosa
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chemistry
8.Quantitative structure-cytotoxicity relationship of anti-HIV 5-phenyl-1-phenylamino-1H-imidazole derivatives.
Acta Pharmaceutica Sinica 2010;45(2):274-278
Both AM1 semi-empirical quantum chemistry method and HF/3-21g* ab initio method were employed to get related parameters or descriptors, particularly, the parameters of the solvation energy delta G with polarizable continuum model, for 42 anti-HIV 5-phenyl-1-phenylamino-1H-imidazole derivatives with known cytotoxicity. With parameters of quantum chemical calculation and traditional ones, 2 multiple linear regression models were obtained. The better regression equation has a high correlation coefficient (r = 0.938) and a low standard deviation (s = 0.125) and the squared correlation coefficient Q2 of the cross-validation is 0.799 (literaure: 0.740) by leave-one-out method. The results have certain significance for the design of new anti-HIV-1 drugs with lower cytotoxicity.
Anti-HIV Agents
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chemistry
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pharmacology
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toxicity
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Imidazoles
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chemistry
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pharmacology
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toxicity
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Linear Models
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Models, Chemical
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Quantitative Structure-Activity Relationship
9.Quantitative structure characteristics and fractal dimension of Chinese medicine granules measured by synchrotron radiation X-ray computed micro tomography.
Xiao-long LU ; Qin ZHENG ; Xian-zhen YIN ; Guang-qing XIAO ; Zu-hua LIAO ; Ming YANG ; Ji-wen ZHANG
Acta Pharmaceutica Sinica 2015;50(6):767-774
The shape and structure of granules are controlled by the granulation process, which is one of the main factors to determine the nature of the solid dosage forms. In this article, three kinds of granules of a traditional Chinese medicine for improving appetite and promoting digestion, namely, Jianwei Granules, were prepared using granulation technologies as pendular granulation, high speed stirring granulation, and fluidized bed granulation and the powder properties of them were investigated. Meanwhile, synchrotron radiation X-ray computed micro tomography (SR-µCT) was applied to quantitatively determine the irregular internal structures of the granules. The three-dimensional (3D) structure models were obtained by 3D reconstruction, which were more accurately to characterize the three-dimensional structures of the particles through the quantitative data. The models were also used to quantitatively compare the structural differences of granules prepared by different granulation processes with the same formula, so as to characterize how the production process plays a role in the pharmaceutical behaviors of the granules. To focus on the irregularity of the particle structure, the box counting method was used to calculate the fractal dimensions of the granules. The results showed that the fractal dimension is more sensitive to reflect the minor differences in the structure features than the conventional parameters, and capable to specifically distinct granules in structure. It is proved that the fractal dimension could quantitatively characterize the structural information of irregular granules. It is the first time suggested by our research that the fractal dimension difference (Df,c) between two fractal dimension parameters, namely, the volume matrix fractal dimension and the surface matrix fractal dimension, is a new index to characterize granules with irregular structures and evaluate the effects of production processes on the structures of granules as a new indicator for the granulating process control and optimization.
Drugs, Chinese Herbal
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analysis
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Fractals
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Medicine, Chinese Traditional
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Powders
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Quantitative Structure-Activity Relationship
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Synchrotrons
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Technology, Pharmaceutical
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Tomography, X-Ray Computed
10.Application of an R-group search strategy into three-dimensional quantitative structure-activity relationship of HEA beta-secretase inhibitors and molecular virtual screening.
Bozhi SHI ; Yonglan LIU ; Yueting LI ; Guixue WANG ; Guizhao LIANG
Journal of Biomedical Engineering 2014;31(1):196-204
The beta-secretase is one of prospective targets against Alzheimer's disease (AD). A three-dimensional quan titative structure-activity relationship (3D-QSAR) model of Hydroethylamines (HEAs) as beta-secretase inhibitors was established using Topomer CoMFA. The multiple correlation coefficient of fitting, cross validation and external validation were r2 = 0.928, q(loo)2 = 0.605 and r(pred)2 = 0.626, respectively. The 3D-QSAR model was used to search R groups from ZINC database as the source of structural fragments. As a result, a series of R groups with relatively high activity contribution was obtained to design a total of 15 new compounds, with higher activity than that of the template molecule. The molecular docking was employed to study the interaction mode between the new compounds as ligands and beta-secretase as receptors, displaying that hydrogen bond and hydrophobicity played important roles in the binding affinity between the new compounds and beta-secretase. The results showed that Topomer CoMFA and To pomer Search could be effectively used to screen and design new molecules of HEAs as beta-secretase inhibitors, and the designed compounds could provide new candidates for drug design targeting AD.
Amyloid Precursor Protein Secretases
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antagonists & inhibitors
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Drug Design
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Hydrophobic and Hydrophilic Interactions
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Ligands
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Molecular Docking Simulation
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Quantitative Structure-Activity Relationship