cIAP2蛋白下調(diào)乙型肝炎病毒多聚酶水平機(jī)制的初步研究
[Abstract]:Hepatitis B virus (HBV) is a pathogen that is seriously harmful to human health, and its greatest harm is that chronic persistent infection of HBV is easy to develop into liver cirrhosis or liver cancer. Currently, the drugs for treating HBV are mainly interferon (IFN), nuclear antigen analogs (lamivudine lamivudine, etc.) and immunomodulators, but these methods can only reduce the virus copy number in the body, and can not finally clear the hepatitis B virus in the body. It has been shown that tumor necrosis factor-1 (TNF-1) can inhibit the replication of HBV by non-killing mechanism, and the possible mechanism is the activation of the NF-K B pathway by TNF-antigen, which in turn affects the package of virus core particles. In this paper, Dr. Liu Xiaoying, in this room, was used to screen the gene expression profile of HepG2 cells treated with TNF, and it was found that the expression of the protein 2 could be significantly induced, and that the expression of the protein could inhibit the replication of HBV. Further, it was found that cIAP2 could downregulate the HBV RNA water. In view of the fact that the clAP2 protein is an E3 ligase, the protein degradation can be mediated, so the expression clAP2 ( ?) The plasmid of each of the HBV-encoding proteins is co-transfected into the cell, and it is found that the clAP2 can specifically down-regulate the water of the HBV polymerase. On the basis of this, it is proposed to further clarify its molecular machine System. First, the expression method was used to confirm that the expression of clAP2 in the liver cell system could significantly reduce the HBV polymerase. And the level of the endogenous clAP2 protein in the Huh7 and Hela cells is further detected by using the RNA interference technique, and the level of the HBV multimer can be obtained. In view of the fact that the clAP2 protein is composed of the BIR domain, the CARD domain and the RING domain, a truncated mutant of each domain of the clAP2 protein is constructed in the study to understand the domain of the clAP2 down-regulation of the level of the polyenzyme protein, and the truncated mutant of the clAP2 protein is co-rotated with the HBV polymerase expression plasmid. The results of the experiment show that the BIR2 and RING domains of the clAP2 protein are down-regulated in the cells. Due to the fact that the C-terminal RING domain of the clAP2 protein has the activity of E3 ligase, the degradation of the substrate caused by the specific substrate ubiquitination can be promoted, the deletion mutant plasmid of the clAP2 E3 function is further constructed, and the mutant plasmid is co-transfected with the HBV polymerase into the H uh7 cells, it was found that this mutant could not down-regulate the level of the expression of the polyenzyme, suggesting that the clAP2 down-regulate the level of the multimer expression and its RING domain E3 connection The enzyme activity is related. clAP2 should be used as the E3 ligase of the HBV polymerase. In order to confirm this, a clAP2 containing the GST-labeled protein and each of the truncated constitutional particles was constructed and expressed in a prokaryote. The results of the GST-pull down show that the clAP2 and the HBV polymerase have a direct interaction in vitro, and this interaction is mediated by BIR2 and BI of clAP2. At the same time, the fluorescent test suggested that the HBV polyenzyme was mainly located in the cytoplasm of the cell, and it was closely related to the clAP2 protein. in order to detect whether the clAP2 can be used as E3 ligase to mediate the ubiquitin molecule to be linked to the HBV polymerase and lead to the degradation of the ubiquitin, the in vivo ubiquitination experiment is further adopted, and the result proves that the clAP2 can promote the HBV The ubiquitination of the polyase is enhanced. It is known that the ubiquitin molecule is usually linked to the substrate in two modes: via a lysine site inside the substrate The results of this research show that the instability of the HBV polymerase is mainly mediated by its TP and RH domains. In this study, the lysine sites on the TP and RH domains were first mutated to arginine, and the results showed that the modified polyenzyme It can still be degraded by clAP2, suggesting that the clAP2-mediated ubiquitin molecule may not be linked to the HBV polymerase. The further study shows that the macromolecular tag attached to the N-terminal of the HBV polymerase can stabilize the protein and indicate the instability of the HBV polymerase. In conclusion, by transient transfection and RNA interference, it is clear that the clAP2 protein can downregulate the level of HBV polymerase protein. It was found that the biR2 and RING domains of clAP2 play a very important role in the degradation of the biR2 and the RING domains of clAP2, and the interaction of clAP2 with the HBV polymerase is mainly caused by BIR2. And the clAP2 can mediate the binding of the ubiquitin molecule to the N-terminal amino acid residue of the HBV polymerase. The above-mentioned research part reveals the mechanism of down-regulation of the level of HBV polymerase protein by the ubiquitin-related protein clAP2, and can be used for clinical treatment of hepatitis B and for searching for potential medicine.
【學(xué)位授予單位】:復(fù)旦大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2010
【分類號(hào)】:R373.21
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