eRF3b羧基端部分多肽片段的分子克
[Abstract]:Objective: Hepatitis B virus (HBV) is a worldwide epidemic disease caused by hepatitis B virus (HBV), which is one of the most harmful types of hepatitis known in the world. Carriers: About 230,000 people die of hepatitis every year. For these reasons, our country also spends a lot of money on prevention and treatment of hepatitis B. It has been reported that the annual cost of prevention and treatment of hepatitis B is about 50 billion yuan [2,3]. Although there are many studies on hepatitis B, there is no good cure for hepatitis B, so far. Hepatitis B poses a great threat to the health level of the people and the national financial revenue. Therefore, it is urgent to study new diagnostic methods with high sensitivity and specificity, and find new valuable biomarkers, so as to achieve early prevention, early diagnosis, early treatment and improve the patient's condition.
It is of great significance to study the mechanism of viral hepatitis B and to prepare polyclonal antibodies against the carboxyl-terminated polypeptide fragments of eRF3b. In the previous study, MALDI-TOF MS technique was used to identify 4210Da protein as "GSPT2, Eukaryotic Peptide Chain Releasing Factor GTP Binding Subunit (eRF)", which is a part of the cleavage of eRF3b-37 peptide.GSPT2 encodes eRF3b. ERF3b plays an important role in the immune response to hepatitis B virus infection. 4210Da polypeptide, as a part of the peptide, is constantly present in the blood. The expression of eRF3b is significantly different in different groups of liver diseases, suggesting that it can be used as an acute hepatitis B (AHB) to change to chronic hepatitis B. (CHB) and biomarkers [1]. in patients with liver cancer (HCC) screened from chronic hepatitis B (CHB).
The aim of this study is to prepare the rabbit polyclonal antibody against GST-eRF3b-37 and the rat polyclonal antibody against GST-eRF3b-37, which will be used as a marker for the future study of hepatitis B. It provided a basis for the study, and laid the foundation for the molecular epidemiological study of hepatitis B.
Method:
(1) Molecular cloning of GSPT2-111. Human genomic DNA was extracted from peripheral blood by guanidine hydrochloric acid method [14] and a large number of GSPT2-111 gene fragments were amplified by polymerase chain reaction (PCR). The GSPT2-111 gene fragments were linked to the expression vector pGEX-4T-1 (GST) by BamH I and EcoR I, and extracted by alkaline lysis [14]. Plasmids were digested with BamH I and EcoR I, then plasmid PCR was identified and sequenced.
(2) Expression and solubility identification of GST-eRF3b-37 fusion protein. GSPT2-111 gene fragment was cloned into pGEX-4T-1 (GST) expression vector. After transfection into E. coli DH5a, GST-eRF3b-37 fusion protein with GST tag was obtained by 1.0 mM IPTG induction. The expression and solubility of GST-eRF3b-37 fusion protein were detected by 10% SDS-PAGE electrophoresis.
(3) Purification of fusion protein GST-eRF3b-37. GST-eRF3b-37 fusion protein was expressed in large quantities. GST-eRF3b-37 fusion protein with GST tag was purified by GST SefinoseTM Resin. The purified GST-eRF3b-37 fusion protein was detected by 10% SDS-PAGE electrophoresis.
(4) Preparation of polyclonal antibodies. New Zealand white rabbits and rats were immunized with fusion protein GST-eRF3b-37 as antigen. 1 ml PBS (containing 1 mg antigen) and an equivalent volume of complete Freund's adjuvant were emulsified and subcutaneously injected into 6 different parts of the back of the animal. Each rabbit was injected with about 300 ml antigen solution at each part, each large. About 30 ml antigen solution was injected into each part of the mice every two weeks for four consecutive times. Complete Freund's adjuvant was used for the first time and incomplete Freund's adjuvant was used for the third time.
(5) Detection and purification of polyclonal antibodies. Detection of fusion protein GST-eRF3b-37 antibody in serum of immunized animals by dot blot hybridization. Purification of fusion protein antibody by Protein A affinity chromatography column. Indirect ELISA was used to determine antibody titer and Western blot was used to detect fusion protein antibody. Specificity of protein GST-eRF3b-37 antibody.
Result:
(1) Molecular cloning of GSPT2-111. In this study, 111bp.
(2) Expression, solubility identification and purification of fusion protein GST-eRF3b-37. Induced by 1.0 mM IPTG, the recombinant plasmid pGEX-4T-1-GSPT2-111 of E. coli DH5a was expressed with a molecular weight of about 30 kDa, which was consistent with the theoretical molecular weight of GST (26 kDa) and eRF3b-37 (4.1 kDa) and was a soluble protein.
Fusion proteins were purified from GST SefinoseTM Resin to immunize 2 New Zealand white rabbits and 10 rats for two months.
(3) Detection and purification of polyclonal antibodies. After four immunizations, the fusion protein GST-eRF3b-37 was detected by dot blot hybridization. The antibody titer was tested by indirect ELISA. The rabbit antibody titer was more than 51,200 and the rat antibody titer was more than 12,800 before purification. The titer of purified rabbit antibody was higher than 384,000 and the IgG was 60mg/ml. The titer of purified rat antibody was higher than 25,600 and the IgG was 25mg/ml. Western-blot results showed that the purified antibody could detect the GST-eRF3b-37 fusion protein with a clear molecular weight of about 30kDa, whether the rabbit antibody was diluted at 1:6000 or the mouse antibody was diluted at 1:3000. The strip.
Conclusion:
(1) cloned the GSPT2-111 gene fragment and constructed the recombinant plasmid pGEX-4T-1-GSPT2-111..
(2) expression and purification of GST-eRF3b-37 fusion protein.
(3) Rabbit anti-human GST-eRF3b-37 polyclonal antibody and rat anti-human GST-eRF3b-37 polyclonal antibody were prepared and purified.
【學(xué)位授予單位】:河北醫(yī)科大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2011
【分類號】:R373
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4 陳U,
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