鼠疫菌毒力調(diào)節(jié)因子Hfq及CRP作用機(jī)制的研究
[Abstract]:BACKGROUND: The plague is a natural infectious disease caused by Yersinia pestis. In the process of infecting the host, the Yersinia pestis must be adjusted in time to adapt to the external environment pressure while maintaining its virulence and pathogenicity, which are accompanied by changes in the regulation of the Yersinia pestis genes. The regulation factors of the regulation factors, such as Hfq and CRP, play a particularly important role in the regulation of virulence. Hfq is a sRNA molecular chaperone, which mediates the interaction between sRNA and the target mRNA, and the deletion of the gene hfq results in a decrease in the virulence of the Yersinia pestis. The cyclic adeno-monophosphate receptor protein (CRP) plays an important role in the inhibition of carbon source metabolism products, and is a core factor for the regulation of the metabolic pathway and energy metabolism of the Yersinia pestis according to the external carbon source in the survival and reproduction process of the host. The deletion of the Crp gene can lead to a decrease in the virulence of the Yersinia pestis. The effects of two factors, such as Hfq and CRP, on the virulence regulation of Yersinia pestis were studied in this experiment. Methods: The hfq and crp mutants of Yersinia pestis (hfq) and crp mutants (crp) were constructed by mutation of hfq and crp of Yersinia pestis by mutation method based on-Red recombinant system. In the aspect of hfq, the total shadow of the formation of the biofilms by the deletion of the hfq gene of the yersinia pestis was verified by a phenotypic experiment. The response of Hfq to the transcriptional initiation level of each target gene was reflected by the activity of the-galactooligosaccharide. In which the transcription of each target gene to the mRNA level is reflected by the Hfq shadow by a primer extension experiment. In response to that change of the translation of the individual gene of hms to the level of the protein, the hms gene is recombinantly express and the rabbit is immunized to obtain multi-resistance, and western blot is carried out. The c-di-GMP water of the wild strains, hfq and C-hfq strains of Yersinia pestis were analyzed by liquid chromatography-mass spectrometry. In that study of CRP, the difference between the growth of the wild strain and the crp of Yersinia pestis was compared by the growth curve and the different culture medium. The gene (cyaA) transcriptional regulation of CRP on its own gene and the encoding of the adenoid acid cyclase was verified by the primer extension experiment and the activity of the-galactosyenase. Using an electrophoretic mobility experiment (EMSA) and a DNA enzyme I footstep experiment, the binding site of CRP to its own gene and the gene of the encoded adenoid acid cyclase was obtained. Points. The concentration of cAMP in the wild and crp strains of Yersinia pestis was compared. Results: In the presence of pCD1 of plasmid pCD1, Hfq plays a positive role in the process of biofilm formation. In the absence of plasmid pCD1, Hfq has a negative effect on the process of biofilm formation. The results showed that the transcription of hmsP gene was negatively regulated by Hfq, and the other genes of hms were not activated by transcription. The primer extension experiment shows that the hmsHFRS and hmsT gene are positive and the hmsP gene is negative regulated, and the hmsD gene is expressed by the primer extension experiment. The results of Western blot show that the regulation of hms of hms in the post-transcriptional protein level (hfq) is related to the level of mrna. The results showed that, for CRP, the deletion of gene crp results in the growth of Yersinia pestis, the growth rate of crp and the concentration of bacteria in plateau. Wild plant.-Galactomase activity experiment shows that CRP has no regulation on the transcription initiation of its own gene, and the gene cyaA Negative regulation. The primer extension experiment shows that the CRP has no regulation of the mRNA of the gene crp, and the gene cyaA The transcription initiation site of the gene crp is A (-285), and the transcription initiation site of the gene cyaA is G (-1). 33). The experiment of electrophoretic mobility block and the experimental results of DNA enzyme I have shown that CRP has a direct binding on the gene cyaA. The determination of the concentration of intracellular cyclized adenosine phosphate (cAMP) further confirmed the negative regulation of the CRP to the gene cyaA. The results showed that the two virulence regulation factors, Hfq and CRP in Yersinia pestis, were regulated by the respective virulence regulation pathway _ biofilm formation and the regulation of the adenoid acid cyclase, respectively. The results showed that the existence of plasmid pCD1 has a great effect on the process of the regulation of the biological membrane of Hfq. In the presence of the plasmid, the Hfq is under the regulation of the biological membrane, and the Hfq is positive in the case of the deletion of the plasmid. The membrane is negative regulation. hmshfrs and hmsT are regulated by the post-transcriptional mode, hmsP is regulated by transcription and post-transcriptional regulation, and the formation of biofilms is co-regulated. hmsD is not involved in the regulation of hfq under the experimental conditions. The CRP has no regulation on its own gene and does not act on its base. As a result of the promoter region. Inhibition of its transcription. CRP inhibits the production of cAMP by acting on the adeno-acid cyclase gene, which represents the negative feedback self-regulation of CRP in the Yersinia pestis.
【學(xué)位授予單位】:吉林大學(xué)
【學(xué)位級別】:博士
【學(xué)位授予年份】:2014
【分類號】:R516.8
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