傷寒沙門菌長鏈反義RNA AS-RpoH分子特性及功能初步研究
[Abstract]:Objective: Non-coding RNA (ncRNA) plays an important role in gene expression regulation network and has been widely found and studied in many bacteria. Through the analysis of transcriptional RNA-seq of Salmonella typhimurium (S. Typhi) under different stress conditions, we found reverse-coding RNA of RPO H gene, named AS-RpoH. The purpose of this study was to identify AS-RpoH and investigate its molecular expression and function in S.Typhi. METHODS: 1. AS-RpoH molecular characterization analysis: AS-RpoH specific primers and hybridization probes were designed, and the expression of AS-RpoH in S.Typhi was confirmed by RT-PCR and Northern Blot, and the transcription of AS-RpoH was investigated by 5'RACE and RT-PCR. The expression characteristics of AS-RpoH were analyzed by Northern Blot and real-time fluorescence quantitative PCR (q RT-PCR), and the expression levels of AS-RpoH in logarithmic wild strains (OD600 0.4) were analyzed by Q RT-PCR. Analysis of the effect of sigma factor on AS-RpoH expression: Select sigma factor deletion mutants (rpo E and RPO S) which have been prepared in the early stage of the laboratory, and analyze the expression characteristics of AS-RpoH in different defective strains under different conditions by Q RT-PCR. 4. Prepare AS-RpoH high-expression strain: Cover the coding region of RPO H in ncRNA AS-RpoH A pair of primers were designed and primers were added with Noc I and Xho I digestion sites. The AS-RpoH gene fragments were amplified by PCR and inserted into the P BAD/Myc-His A vector. After digestion, PCR and sequencing, the recombinant vector (p BAD-AS-RpoH) and empty vector (p BAD/Myc-His A) were electrotransformed into S.Typhi wild strain to construct a highly expressed strain (WT-p-p-p). BAD-AS-RpoH and blank plasmid control strain (WT-p BAD). 5. Dynamics test: 0.3% isotonic semi-solid dynamic medium was prepared. The strains with high expression of AS-RpoH and the control strains were inoculated on the power plate respectively and cultured at 37 C for a certain period of time. 6. Growth curve was compared according to the diameter of the bacterial circle. The growth of AS-RpoH high-expression strains and control strains under different conditions was observed by using OD600 as ordinate and time as abscissa. 7. Invasion test of He La epithelial cells: AS-RpoH high-expression strains and control strains were cultured to logarithmic phase, incubated with He La cells, and the invasiveness of the two bacteria to epithelial cells was analyzed and compared. Differentiation. 8. Stability analysis of RPO H m RNA: AS-RpoH high-expression strains and control strains were cultured to logarithmic phase, and the RPO H m RNA level was analyzed by Q RT-PCR. Results: 1. RT-PCR and Northern Blot detection showed that AS-RpoH was expressed in S. CR results showed that the transcriptional termination sites of AS-RpoH ranged from 3461 to 3508 NT at the 5'-terminal; Northern Blot analysis showed that the length of hybridization bands of yhh K coding region probe was basically the same as that of AS-RpoH peak region probe. 2. Northern Blot and Q RT-PCR results showed that the expression level of AS-RpoH had no significant difference at different growth stages. The expression of AS-RpoH in RPO S was down-regulated and that in RPO E was unchanged compared with that in WT. The expression of AS-RpoH in WT, RPO S and RPO E did not change significantly under oxygen stress and hyperosmotic stress. Under WT and RPO E, AS-RpoH expression was down-regulated, and the expression of AS-RpoH in RPO S was unchanged. 4. High expression strain of AS-RpoH (WT-p BAD-AS-RpoH) and blank plasmid control strain (WT-p BAD) were successfully constructed. 5. Dynamic test showed that the high expression strain of AS-RpoH and the control strain had no significant change in dynamics. 6. The growth curve showed that AS-RpoH high expression strain and control strain had no significant change under different stress. Compared with the control strain, the invasion ability of AS-RpoH-overexpressing strain to He La cells was weakened. 8. Q RT-PCR results showed that the high expression of AS-RpoH could improve the stability of rpo-H m RNA. Conclusion: A long-chain antisense RNA AS-RpoH was identified in S. Typhi, and its molecular length was 3461-3508 nt. RpoS may be involved in regulating the expression of AS-RpoH under acid stress; AS-RpoH can decrease the invasiveness of bacteria to He-La cells and improve the stability of rpo-H m RNA.
【學(xué)位授予單位】:江蘇大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2017
【分類號】:R378
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