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人β防御素3和植物甜蛋白des-pGlu1-Brazzein基因的重组表达研究
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摘要
食品安全一直是人们关注的焦点,安全、天然的食品添加剂是保障食品安全的重要方面。人β防御素3(hBD_3)因其广谱高效的杀菌作用和较低的细胞毒性,有望成为新型食品防腐剂。植物des-pGlul-Brazzein甜蛋白因其高甜度和对pH、热的稳定性而有望成为新型甜味剂。本课题以大肠杆菌和甲醇酵母为宿主重组表达了hBD_3、des-pGlul-Brazzein以及两者的嵌合基因,并采用摇瓶发酵分析了适合三株重组大肠杆菌菌株生长和目的蛋白表达的发酵条件。主要结果如下:
     采用细菌和酵母偏爱密码子分别合成了hBD_3、des-pGlul-Brazzein及两者的嵌合基因片段(中间加了一段编码凝血酶酶切位点的片段),这些编码序列被插入pET30a和pPIC9K载体,分别构建成重组载体pET-hBD_3、pET-Bra、pET-hBD_3-Bra和pPIC9K-hBD_3、pPIC9K-Bra、pPIC9K-hBD_3-Bra。
     以E.coli为重组表达宿主,pET30a为表达载体,对hBD_3进行了融合表达,重组hBD_3融合蛋白占总蛋白的30.9%,实现了目的蛋白的高效表达。通过亲和层析和进一步酶切纯化得到了较纯的hBD_3蛋白,无论是重组hBD_3融合蛋白还是hBD_3蛋白对革兰氏阳性菌金黄色葡萄球菌和革兰氏阴性菌大肠杆菌都具有较高的抑菌活性,并且酶切后得到的hBD_3蛋白的活性比重组hBD_3融合蛋白高,完全可以与提取得到的天然hBD_3的活性相媲美。
     以E.coli为重组表达宿主,pET30a为表达载体,对des-pGlul-Brazzein进行了融合表达,重组des-pGlul-Brazzein融合蛋白占总蛋白的35%以上,通过亲和层析和进一步酶切纯化得到了较纯的des-pGlul-Brazzein蛋白,两者的相对甜度分别是蔗糖的400和600倍,在80℃作用4h后其甜味并未丧失,说明得到的甜蛋白具有较强热稳定性。
     以E.coli为重组表达宿主,pET30a为表达载体,对嵌合基因hBb_3-Bra进行了融合表达。hBD_3-Bra融合蛋白占总蛋白的30.5%,实现了在大肠杆菌中的高效表达。融合蛋白只有很弱的杀菌活性,但甜度约为蔗糖200倍,通过凝血酶切割纯化后,得到了具有明显杀菌活性的重组hBD_3融合蛋白和甜度约为蔗糖600倍的des-pGlul-Brazzein蛋白。
Food safety is one of the hot spot all the time, and the natural & safe food additive is the key to assuring food safety. Human p-defensin-3 (hBD_3) is expected to be developed as a new food antimicrobial additive because of its broad-spectrum antimicrobial activity and low cytotoxicity to human. The sweet-tasting protein des-pGlul-Brazzein, isolated from the fruit of Pentadiplandra brazzeana Baillion, is expected to be developed as a new food sweet additive because of its high sweetness and heat & pH-stability. The project aimed at: (1) High-level expression of hBD_3, des-pGlul-Brazzein and hBD_3-Bra mosaic gene in E.coli and Pichia pastoris respectively; (2) Optimizing the fermentation conditions of the target strains by flask shake. The main results are shown as following:According to Escherichia and yeast biased codon, the coding sequence of hBD_3, des-pGlul-Brazzein and mosaic gene hBD_3-Bra ( connected with the sequence coding thrombin cleavage site) were constructed respectively, and were inserted into the multiclone site in pET30a and pPIC9K vector respectively, resulting in the recombinant expression vectors pET-hBD_3, pEl-Bra, pET-hBD_3-Bra and pPIC9K-hBD_3, pPlC9K-Bra, pPIC9K-hBD_3-Bra.The fusion protein of hBD_3 was expressed by using pET30a as expression vector and E.coli as host, the recombinant protein was expressed after induction by IPTG, which accounted for 30.9% of total protein of host cell. The recombinant fusion protein of hBD3 was purified by affinity column and then digested by enterokinase and purified by affinity column again, resulting in the recombinant natural hBD_3. The two interested protein both have high antimicrobial activity against E.coli and S.aureus, similar as natural protein.The fusion protein of des-pGlul-Brazzein was expressed by using pET30a as expression vector and E.coli as host, the recombinant protein was expressed after induction by IPTG, which accounted for 35% of total protein of host cell. The recombinant fusion protein of des-pGlul-Brazzein was purified by affinity column and then digested by enterokinase and purified by affinity column again, resulting in the recombinant natural des-pGlul-Brazzein. The sweetness of the two interested protein is 200 times and 600 times than that of sucrose respectively, including kept after 4h at 80 °C.
    The chimeric protein of hBD3-Bra was expressed by using pET30a as expression vector and E.coli as host, the recombinant chimeric protein of hBD3-Bra was expressed after induction by IPTG, which accounted for 30.5% of total protein of host cell. hBD3-Bra has a weak antimicrobial activity, but is 200 times sweeter than that of sucrose. After digested by thrombin and purified by affinity column, the recombinant hBD3 has a high antimicrobial activity, and the natural des-pGlul-Brazzein also has 600-time sweetness of sucrose, much sweeter than that of fusion protein Most of the expressed proteins were in inclusion bodies, some was soluble. Both the soluble and renaturation protein from inclusion bodies have their own activity whether by dialysis or by column.The fermentation conditions for BL21-pET-hBD_3, BL21-pET-Bra and BL2l-pET-hBD3-Bra were optimized respectively by flask shake. The best conditions for growth and fermentation were basically same, i.e. culture volume 100mL (500mL flask), seed dose 1.5%, medium original pH value 7.0. The culture volume was the most important factor. The growth speed would be lower as the culture volume increased more. It suggested the content of soluble O2 is key factor for growth and fermentation of the strains,. The biomass would increase as time passed.In order to study the influence of different concentration of inducer, temperature and time on the growth and the yield of target protein of strain respectively, the strains were induced by IPTG and lactose at 37°C and 30°C for 4h and 6h respectively. The results showed that the concentration of IPTG had no obvious effect on the growth and the yield of expression of strains between 0.2-lmM, The concentration of lactose obviously inhibit the growth of s
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