產(chǎn)單核細(xì)胞李斯特菌減毒突變株的構(gòu)建及其免疫生物學(xué)特性的研究
[Abstract]:Listeria monocytogenes (Listeria monocytogenes,LM) is the pathogen of Listeria monocytogenes. It can cause meningitis, febrile septic gastroenteritis, miscarriage of pregnant women and so on by eating food contaminated with LM. The death rate after infection was about 25%. There have been many outbreaks in Europe and America, and the contamination and harm of food by LM has attracted worldwide attention. Among them, the development of live attenuated vaccine against Listeria monocytogenes is one of the most important topics. On the other hand, since LM is an intracellular parasite, attenuated LM is one of the promising vaccine vectors. In this study, two virulence genes, actA and plcB, were deleted from the genome of wild-type strains with serotype of 1 / 2a by homologous recombination, and the attenuated recombinant strains were obtained. The study on the transport of mode protein GFP by prokaryotic and eukaryotic expression was carried out with attenuated strain. In order to evaluate the immune protection of the attenuated strain and to confirm the deletion of the gene at different levels, the virulence genes hly and actA were expressed in E. coli and the monoclonal antibody against ActA protein was developed. The acquisition of attenuated mutants not only plays an important role in the prevention of Listeria, but also lays a foundation for the construction of vaccine vectors for the prevention of human and animal diseases. In addition, it provides conditions for LM to elucidate the pathogenicity of virulence factors and immune protection. 1. Prokaryotic expression of actA gene and hly gene of Listeria monocytogenes and preparation of ActA monoclonal antibody actA gene was amplified from 1 / 2 a LM4 strain of serotype by PCR technique. The expression of the target protein was induced by IPTG after the construction of prokaryotic expression vectors pGEX-6P-1-actA and pET-actA, into E.coli. The results of SDS-PAGE electrophoresis showed that actA gene was expressed in both vectors. The size of the fusion protein was about 120KD and 97kD, respectively.
【學(xué)位授予單位】:揚(yáng)州大學(xué)
【學(xué)位級(jí)別】:博士
【學(xué)位授予年份】:2006
【分類號(hào)】:R378
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