Cdc42在甲型流感病毒NA蛋白修飾及轉(zhuǎn)運(yùn)中的作用
[Abstract]:Influenza virus neuraminidase (NA) has enzyme activity and plays an important role in virus invasion and release. According to its characteristics, NA has become the most suitable target for the design of anti-influenza drugs. At present, although studies continue to improve the NA inhibitors, influenza virus strains are still rapidly developing drug resistance to these drugs. Therefore, it is urgent to develop new anti-influenza drugs and find new targets. In host cells, many host proteins play an important role in the replication of influenza viruses. Among them, Cdc42,RhoA and Rac1, three important family members of small G protein RhoGTPases, are involved in many cell signal transduction pathways and participate in many cellular biological activities as molecular switches. More and more studies show that they are involved in the regulation of intracellular transport. However, whether they play a role in intracellular transport of NA protein and which of them is involved has not been reported. This paper studies this problem. We first observed the localization of NA and NA (H274Y) mutants in cells and detected the decrease of surface enzyme activity of NA (H274Y) mutants, and established a system of intracellular transport of NA proteins. Then, the cells transfected with NA were treated with Toxin B, which confirmed that Rho GTPases family members (Cdc42, RhoA and Rac1) promoted the intracellular transport of NA protein. Then we observed the co-localization of Cdc42,RhoA and Rac1 and their continuous activation and inhibition with NA protein, as well as the drug C3Transferase treatment. It was proved that Cdc42 played a promoting role. Our exogenous transfer into Cdc42, a specific GTP activator protein, (GAP)-ARHGAP21, inhibited the activity of Cdc42 in host cells, further confirming the role of endogenous Cdc42. We also studied the interaction between Cdc42 and NA protein. GST-pulldown test showed that there was no direct interaction between Cdc42 and NA. TGN and GM130 were used to label Golgi body respectively. Confocal test showed that Cdc42 affected the transport of NA protein from Golgi body to cytoplasm and cell membrane. Subsequently, the Cytochalasin D treatment test revealed that Cdc42 affected the transport of NA protein through the regulation of actin. In addition, we constructed a series of NA deletion mutants for NA signal peptide region. We found that the absence of more than 10 amino acids in the transmembrane region of NA resulted in no expression of NA protein. We studied the protein transport of the mutant with NA deletion of 11 amino acid. The results showed that the localization in the cell had not changed. These results suggest that Cdc42 plays an important role in the modification and transport of NA protein of influenza A virus. The mechanism of Cdc42 in NA protein transport needs further study.
【學(xué)位授予單位】:福建農(nóng)林大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2011
【分類(lèi)號(hào)】:R373.13
【共引文獻(xiàn)】
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