HIV-1整合酶抑制劑篩選及其活性檢測(cè)方法研究
[Abstract]:Since the discovery of AIDS patients for the first time in 1981, the rapid spread of AIDS worldwide has seriously threatened the health of mankind and has caused enormous damage to society. AIDS is caused by human immunodeficiency virus (HIV-1), and specific active sites and critical enzymes in viral replication cycles provide potential targets for antiviral chemotherapy. in which HIV-1-encoded integrase (IN) binds HIV-1 back-transcribed product cDNA into the host genome, which is an indispensable enzyme in the viral replication process. Since the functional analogue of IN is not present in the normal cells of the human host, the inhibitor specifically acting on IN is less toxic to normal cells, and in the meantime, the IN employs a single active site to accommodate two different DNA substrates, This, to some extent, limits HIV-1-induced resistance to the IN inhibitor and is therefore a very meaningful target for the development of anti-HIV-1 drugs. In vivo, the whole action is a multi-step reaction process, which mainly includes the combination of virus cDNA and IN, 3 '-processing; IN binds the virus cDNA to the host cell D by chain transfer reaction NA. In vitro, using recombinant IN protein, oligo-DNA substrate and divalent metal ion can realize the whole function of IN in vivo, thereby establishing a screening method of an effective IN inhibitor, which is the main screening method of the IN inhibitor in vitro. The recombinant IN protein was purified by this study, and the high-throughput screening of HIV-1 integrase inhibitor was established. Compared with the original method, the new screening method is sensitive and reliable, Low cost. The drug screening not only includes the biological experiment method, but also the computer-aided virtual screening method also occupies more and more in drug screening. This paper not only carries on the exploration of the screening method of the whole enzyme inhibitor on the basis of biology experiment, but also the virtual screening of the whole enzyme inhibitor from the angle of computer simulation and machine learning. The activity of HIV-1 integrase inhibitor was investigated by means of CoMFA analysis and support vector machine (SVM) modeling, and a prediction model based on quantitative structure effect relation (QSAR) and SVM was established. The results show that SVM shows strong modeling and prediction capability. The work of the thesis mainly comprises the following three aspects: (1) expression and purification of the whole enzyme protein and carrying out the activity identification of chain transfer reaction, firstly, transforming the prokaryotic expression vector of HIV-1 into the prokaryotic expression vector of the whole enzyme of HIV-1 (+)/ IN (F185K/ C280S) into E. coli JM109 cell B, L21 (DE3) was expressed in the prokaryotic expression vector, which contained IN gene and introduced F185K/ C. 280S mutation to improve protein solubility. Purification by affinity chromatography with nickel agarose gel to obtain purity and carrying out chain transfer activity identification on the recombinant protein by using a high-flux enzyme-linked immunosorbent assay (ELISA), The method lays a foundation for the screening method of the reaction inhibitor. The aim of this study is to establish an efficient and convenient screening method for the enzyme transfer inhibitor of HIV-1 integrase chain transfer. The target DNA labeled with FITC-labeled body DNA and fluorescent group is used to capture the DNA product in the reaction system by streptavidin magnetic beads; and finally, the DN is detected by a fluorescence analyzer. The fluorescence signal of A product is calculated and the inhibition rate of the sample to be measured is calculated. The screening method is verified by using the known whole enzyme inhibitor S-1360 and MK-0518, and the measurement result is consistent with the existing experimental data, so that the screening method can be effectively and reliably applied. Compared with the screening method of the original whole enzyme chain transfer reaction inhibitor, the screening method has the remarkable improvement: (i) the original HIV-1 integrase chain transfer reaction inhibitor in vitro screening method The method is characterized by that a fluorescent group is used to mark the target DNA, the fluorescent signal of the fluorescent group can be directly detected, The chain transfer reaction activity of the enzyme or the inhibition activity of the sample to be measured is evaluated, so that the method is simpler and labor-saving, The method does not need to use the anti-goxin antibody, and the cost is lower. The method can also be applied to the de-integration. The research on the mechanism of reaction and inhibitor action has important academic and application values. CoMFA and SVM are used to construct a screening model SVM for the anti-HIV-1 integrase inhibitor, which is applied to inhibitor screening, and the quantitative structure effect relationship (Q) is carried out on the inhibitor. SAR modeling to combine the activity of the compounds A regression equation is established to predict the activity of a new compound by establishing a regression equation to predict the activity of the new compound, and the structure parameters such as the topology, molecular polarization, hydrophilicity and the like of 68 oxycodone compounds are calculated by the CoMFA software, Using the selected structural parameters as the input of the SVM, a nonlinear support vector regression model was established. The correlation coefficient between the activity predicted value and the experimental value of the training set was 0.9938, and the correlation coefficient of the activity predicted value and the experimental value of the test set was 0. 804, indicating the predicted activity predicted value of the model. This study uses SVM and CoMFA to provide some useful exploration and valuable information to establish the inhibitor screening model, which not only can
【學(xué)位授予單位】:北京工業(yè)大學(xué)
【學(xué)位級(jí)別】:博士
【學(xué)位授予年份】:2013
【分類號(hào)】:R512.91;R446.1
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