多表位恶性疟疾疫苗M.RCAg-1在大肠杆菌表达的条件优化和大规模培养 |
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引用本文: | 孙成金,王健,丁军颖,郭鹏,郑凡,张振龙.多表位恶性疟疾疫苗M.RCAg-1在大肠杆菌表达的条件优化和大规模培养[J].微生物学免疫学进展,2009,37(3):29-33. |
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作者姓名: | 孙成金 王健 丁军颖 郭鹏 郑凡 张振龙 |
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作者单位: | 北京生物制品研究所,北京,100024 |
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基金项目: | 国家863"疫苗与抗体工程"重大专项资助 |
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摘 要: | 通过以培养基配方、IPTG浓度、金属离子复合液浓度、镁离子浓度、表达时间、接种量、诱导时间点等发酵的重要条件对重组蛋白表达量影响的研究,确定多表位恶性疟疾疫苗M.RCAg-1蛋白最佳表达条件为以改良TB培养基培养、最优Mg2+,诱导剂IPTG和金属离子复合液浓度分别为10mmol/L,0.5mmol/L,6μl/ml,接种量为10%,表达时间为4.5h,将优化后的参数用于50L发酵罐进行连续3批中试规模的发酵,最终收获菌体湿重平均为31.8±1.78g/L,目的蛋白表达量可占菌体总蛋白的50%左右,试验确定了恶性疟疾多表位随机组合蛋白M.RCAg-1在大肠杆菌中的最优表达条件,该条件能够适合大规模培养需要。
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关 键 词: | 恶性疟疾 大肠杆菌 表达优化 |
The optimal condition for expression and large-scale culture of candidate vaccine against Plasmodium falciparum in E.coli |
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Abstract: | The factors influencing the expression of recombination protein and vaccine culture were detected these factors include the medium composition,concentration of IPTG,the concentration of metalions compound liquid,ionic strength of Mg2+,expression time,inoculum dose,induction time and induction dose.The results showed that the optimal conditions for the expression of recombination protein and vaccine culture are as follows:the modified TB culture medium is the best,the optimal concentration of Mg2+,inducer IPTG and ions compound liquid was 10mmol /L,0.5mmol /L,6μl/ml respectively,the inoculum dose is 10% and the induction time is 4.5 h.three consecutive bathes of fermentation culture in a polot scale were carried out at the conditions of the above mentioned optimal parameters.The yield of bacteria reaches the average value of 31.8±1.78g/L and the expressing level of recombinant M.RCAg-1 is about 50% of the host protein in 50 liter fermentor.These conditions can be suitable for large scale culture. |
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Keywords: | Plasmodium falciparum Escherichia coli Optimized expression |
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