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首页> 外文期刊>Applied Microbiology and Biotechnology >Fed-batch production of recombinant human calcitonin precursor fusion protein using Staphylococcus carnosus as an expression-secretion system
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Fed-batch production of recombinant human calcitonin precursor fusion protein using Staphylococcus carnosus as an expression-secretion system

机译:肉食葡萄球菌作为表达分泌系统的分批生产重组人降钙素前体融合蛋白

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A pH-auxostatic fed-batch process was developed for the secretory production of a fusion protein consisting of the pro-part of Staphylococcus hyicus lipase and two synthetic human calcitonin (hCT) precursor repeats under the control of a xylose-inducible promotor from Staphylococcus xylosus. Using glycerol as the energy source and pH-controlled addition of yeast extract resulted in the production of 2000 mg l(-1) of the fusion protein (420 mg l(-1) of the recombinant hCT precursor) within 14 h, reaching 45 g l(-1) cell dry mass with Staphylococcus carnosus in a stirred-tank reactor. Product titer and space-time yield (30 mg calcitonin precursor l(-1) h(-1)) were thus improved by a factor of 2, and 4.5, respectively, compared to Escherichia coli expression-secretion systems for the production of calcitonin precursors. Two hundred grams of the fusion protein was secreted by the recombinant S. carnosus on a 150-1 scale (scale-up factor of 50) with a minimum use of technical-grade yeast extract (40 mg fusion protein g(-1) yeast extract). [References: 28]
机译:开发了一种pH恒定的补料分批工艺,用于分泌生产一种融合蛋白,该融合蛋白由葡萄球菌脂肪酶的前部分和两个合成的人降钙素(hCT)前体重复序列组成,这些重复序列在木糖诱导的木糖启动子的控制下。 。使用甘油作为能源并控制pH值添加酵母提取物,可在14小时内产生2000 mg l(-1)的融合蛋白(420 mg l(-1)的重组hCT前体),达到45搅拌罐反应器中带有葡萄球菌的gl(-1)细胞干重。因此,与用于生产降钙素的大肠杆菌表达分泌系统相比,产品滴度和时空产率(30 mg降钙素前体l(-1)h(-1))分别提高了2倍和4.5倍。前体。重组鼻肉链球菌以150-1的比例(放大倍数为50)分泌了200克融合蛋白,并最少使用了工业级酵母提取物(40 mg融合蛋白g(-1)酵母)提取)。 [参考:28]

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