光酶誘導(dǎo)桑葉中桑辛素N抗BmNPV機(jī)制及其生物合成關(guān)鍵酶的研究
[Abstract]:Bombyx Mori L. (Bombyx mori.) belongs to Lepidoptera, Silkworm moth family, and Bombyx mori nuclear polyhedrosis virus (BmNPV) disease is the most common and serious type of silkworm disease in silkworm rearing, causing enormous economic losses in silkworm industry. Previous studies showed that mulberry leaves induced by UV-B changed the content of secondary metabolites, and the content of morin N increased significantly. It was found for the first time that mulberry leaves induced by UV-B could improve the resistance of silkworm to BmNPV, and it was speculated that Morin N was the main active component. The differential proteomic analysis of midgut proteins of silkworm by label-free technique revealed the mechanism of inducing mulberry leaves and Morin N resistance. The results provided a new treatment scheme for nuclear polyhedrosis of silkworm and laid a foundation for further study. In addition, the key enzymes inducing the biosynthesis of morin N in mulberry leaves were also studied. The results of this study laid a foundation for studying the changes of secondary metabolites in mulberry leaves induced by UV-B. The main contents and results of this paper are as follows: (1) Photoenzyme-induced changes in mulberry leaves. BmNPV is one of the most harmful viruses to silkworm. In the late stage of BmNPV disease, silkworm often exudes pus and contains a large number of polyhedrosis viruses, commonly known as pyosis. These diseases cause death of silkworm and cause huge economic losses in silkworm industry. The experiment of silkworm anti-virus found that feeding UV-B induced mulberry leaves or coating. After mulberry leaves were fed with mulberry leaves containing Morin N, the resistance of silkworm to BmNPV disease was improved and the mortality of Silkworm Infected with BmNPV was decreased. In order to further study the mechanism of resistance, the midgut of silkworm fed with induced mulberry leaves (BUM) and Morin N (BNM) was analyzed by comparative proteomics. The results showed that 413 and 102 differences were identified between BUM and BNM groups, respectively. Protein. Further analysis by bioinformatics showed that inducing mulberry leaves and Morin N could induce more changes in ribosomal protein expression, regulate protein synthesis and DNA repair, up-regulate ATPase expression and down-regulate ATP synthase expression, thus changing the cellular environment to prevent virus shelling into the cell nucleus and resist virus infection. Morin N can also up-regulate the expression of cytochrome oxidase, Ca2+ related protein and programmed cell death protein, thereby promoting cell apoptosis and inhibiting virus proliferation and replication; up-regulate the expression of lipase-1 and serine protease precursor, thereby enhancing the immunity of silkworm and resisting virus invasion; and up-regulate the expression of histone and Rab proteins. The above results reveal the process of inducing resistance of mulberry leaves and Morin N, which is a new therapeutic scheme for improving the survival rate of Silkworm Infected with BmNPV. (2) Study on the key enzyme of inducing Morin N biosynthesis in mulberry leaves. Morus alba L., mulberry, deciduous tree or shrub, is an important medicinal plant, with a variety of pharmacological effects, but also the main source of silkworm food. Morin is an important secondary metabolite in mulberry leaves, with anti-tumor, anti-inflammatory, anti-virus and other activities. At present, the chemical synthesis of morin N has been reported, but the biosynthesis of morin N has not been reported in detail. The important precursor of biosynthesis of morin N was found to be Morin M. A novel Morin oxidative cyclooxygenase was found in the induced mulberry leaves for the first time. It is important to elucidate the biosynthesis of morin N by catalyzing the cyclization of resveratrol to form Morin M. In addition, the activity of morin oxidative cyclase in mulberry leaves induced by UV-B or cultured in dark was increased by enzyme activity reaction. The extraction conditions of morin oxidative cyclase were optimized by single factor experiment and orthogonal experiment. The results showed that the specific activity of the enzyme was the highest when the pH of the extract was 7.5, the ratio of material to liquid was 1:10, the concentration of the extract was 100 mM and the concentration of Na2-EDTA was 10 mM. The results laid a foundation for the isolation and purification of the oxidative cyclooxygenase from mulberry leaves.
【學(xué)位授予單位】:浙江大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2017
【分類號】:S884.51
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