第一篇:柔嫩艾美耳球蟲2-甲基檸檬酸合成酶的酶促動(dòng)力學(xué)分析 第二篇:雞球蟲基因組DNA甲基化修飾的檢測(cè)
[Abstract]:Genome data analysis revealed that the chicken coccidia has a fungal-like type I 2-MCC pathway catalytic enzyme coding gene. Inhibition or blocking of 2-MCC pathway may be a new drug target for anti-coccidial drugs. It is of great significance to develop new anti-coccidial drugs and to establish new strategies for the prevention and cure of coccidia. On the basis of genomic data analysis, the gene of Eimeria tenella 2-MCC pathway related enzyme was cloned and prokaryotic expression, and the enzyme activity determination and kinetic analysis were carried out on 2-MCC pathway key enzyme 2-methylcitric acid synthase in Eimeria tenella. In order to further study the function of 2-MCC pathway and its related enzymes in chicken coccidia and to find new drug targets and develop new anti-coccidial drugs. The main work of this paper includes: 1. The EMS was successfully cloned by RT-PCR. EtOH. EtCS. The full-length ORF sequence of EtACS and the partial sequence of EtMD and EtML coding genes confirmed the presence of 2-MCC pathways in Cocciella. Bioinformatics analysis of the genomic data of Eimeria tenella found that the gene sequence encoding EtPrpE was completely consistent with the sequence of EACS gene. According to the results reported in some bacteria, ACS may have the PrpE function at the same time in coccidia. EtMS. EtOH. EtCS and EtACS were successfully expressed in E. coli expression system, which laid the foundation for further study of its function. The recombinant expression protein A-EtMS with activity was obtained, and the enzymatic kinetic analysis was carried out. It was confirmed that EtMS was not only able to use propylated coenzyme A as a substrate but also NADA as a substrate, and further explained that the 2-MCC pathway in chicken coccidia was similar to the 2-MCC pathway in bacteria, possibly also with the bypass function of TCA cycle. However, the screening and inhibition kinetic analysis of its inhibitor still need to be studied further. DNA methylation is a covalent modification process (5-xylenol, 5-mC) which uses S-methionogen (SAM) to provide methyl in the catalysis of DNA methyltransferase (DNMTs). Genomic DNA methylation plays an important role in regulating gene expression, cell differentiation and other life processes as an important epigenetic modification system. In this study, the DNA methylation level of 4 species of chicken coccidia was detected, and the DNA methylation levels of Toxoplasma, neospora and three cryptosporidium were also detected. In addition, we also tested genomic DNA methylation level at different developmental stages of chicken coccidia. DNA methyltransferase activity detection of the total protein extract of sporozoites and sporozoites is processed by DNA methyltransferase inhibitor 5-azacytidine to verify whether there is active DNA methyltransferase in the chicken coccidian body, and meanwhile, the DNMT2 coding gene of Eimeria tenella is also cloned, The enzyme activity assay was carried out. Through in vitro culture model, the relationship between DNA methylation level and chicken coccidia invasion cells was studied. The main conclusions of this paper are: 1. It was confirmed that 5-mC was widely existed in the protozoa, but the level was lower. The levels of 5-mC were significantly different in different developmental stages of coccidia, and the sporozospore stage was significantly higher than that of the other 4 stages. The genomic DNA methylation might play an important role in the development and transformation of chicken coccidia. The DNA methylation level of the insect spores genomic DNA of EAMU can be inhibited by the DNA methyltransferase inhibitor 5-azacytidine, and the DNA methyltransferase-like activity can be detected in the total protein extract of the tender Eamey ball worm spore total protein. It is shown that possible DNA methyltransferase-like mechanism exists in chicken coccidia. EtDNMT2 may not have DNA methyltransferase activity. 5. In vitro tests demonstrated that inhibition of the DNA methylation level of sporozoite genomic DNA could promote its invasion of cells.
【學(xué)位授予單位】:中國農(nóng)業(yè)科學(xué)院
【學(xué)位級(jí)別】:博士后
【學(xué)位授予年份】:2016
【分類號(hào)】:S852.7
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