结核分枝杆菌螺旋酶GyrB与GyrA相互作用核心区域的研究
[Abstract]:DNA helicase is the basic enzyme necessary for the survival of prokaryotes and is the natural target of many anticancer drugs (quinolones) and antibiotics (neomycin etc.) and plays a very important role in the prevention and treatment of tuberculosis. In recent years, helicase has become a hotspot in the research of basic life activities and the development and design of new drugs. DNA helicase is a dimeric dimer composed of subunits of DNA B. At present, the interaction between GyrA and GyrB of Mycobacterium tuberculosis is not deeply studied, and the way in which the two subunits are recombined to have the whole enzyme activity. The mechanism is completely unclear. The Toprim domain of Mycobacterium tuberculosis helicase GyrB has been identified as the key region of interaction with GyrA in our laboratory. On this basis, we plan to construct a series of GyrB deletion mutants, analyze the interaction between GyrB and GyrA by yeast two-hybrid and SPR detection, and determine the core region of the interaction between GyrB and GyrA. It provides the basis for the study of the catalytic mechanism of helicase, the regulation function of the helicase in the life activities of Mycobacterium tuberculosis and the screening and development of new drug targets for tuberculosis, and promotes the prevention and treatment of tuberculosis. The main results of this study are as follows: 1. According to the published gyrB gene sequence, the amplified mutant gyrB1-518,gyrB1-531,gyrB1-550,gyrB 531-550 gyrB 548-564; The corresponding expression vector pET28a and yeast vector pGADT7 were constructed from the amplified mutant gene, and the GyrB1-550,GyrB1-531, GyrB1-518 mutant was constructed on the basis of GyrB1-564, and the protein of the mutant was expressed and purified. 2. The results of yeast two-hybrid and SPR showed that the missing C-terminal GyrB could not interact with GyrA, indicating that GyrB-CTD was the necessary functional domain for the interaction between GyrB-CTD and GyrA. 3. The construction of 伪 -helix deletion mutant GyrB 531-550 and yeast two-hybrid experiments showed that the deletion of 531-550aa 伪 helix resulted in the loss of interaction activity between GyrB and GyrA. 伪 helix 531-550aa may be a core region of the interaction between GyrB and GyrA, and 伪 helix 531-550aa may play an important role in the formation of GyrB dimer. 4. GyrB 548-564, an irregular crimp deletion mutant, was constructed. The results of yeast two-hybrid experiments showed that the deletion of 548-564aa short peptide resulted in a decrease in the interaction activity between GyrB and GyrA. 548-564aa short peptides may play an important role in spatially supporting the conformation of Toprim 伪 / 尾 and may interact with other functional domains on GyrB.
【学位授予单位】:华中农业大学
【学位级别】:硕士
【学位授予年份】:2011
【分类号】:R346
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