C4ST-1在大肠杆菌中的可溶性表达
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Soluble Expression of C4ST-1 in Escherichia coli
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    摘要:

    软骨素-4-O-硫酸转移酶-1(Chondroitin-4-O-sulfotransferase-1,C4ST-1,EC 2.8.2.5)催化软骨素N-乙酰半乳糖胺(N-Acetylgalactosamine,GalNAc)4号位羟基硫酸化生成硫酸软骨素A(chondroitin sulfate A,CSA)。C4ST-1含3对二硫键,在Escherichia coli 细胞质内二硫键难以正确形成,故在E. coli 中表达时主要以包涵体形式存在。为提高胞内可溶性蛋白质的表达水平,共表达了催化二硫键从头形成的巯基氧化酶(Erv1p)或/和促进二硫键正确折叠的二硫键异构酶(DsbC)。结果表明共表达DsbC可使C4ST-1融合蛋白的胞内可溶性表达水平显著提高,但C4ST-1和Erv1p共表达对胞内可溶性蛋白质的表达影响相对较小。C4ST-1和Erv1p或C4ST-1和DsbC共表达菌株的酶活分别为原始菌株的1.30和2.33倍,活力达到(12.32±0.76) U/L和(21.99±0.42) U/L。挑取同时共表达C4ST-1、Erv1p和DsbC的菌株进行摇瓶水平和3 L发酵罐放大培养,酶活分别达到(29.12±0.66) U/L和49.97 U/L。本研究为C4ST-1的大规模应用奠定了一定的基础。

    Abstract:

    Chondroitin-4-O-sulfotransferase-1(C4ST-1, EC 2.8.2.5) catalyzes the sulfation of 4-OH of GalNAc to generate chondroitin sulfate A(CSA). C4ST-1 contains three pairs of disulfide bonds and is hard to correctly fold into active form. As a result, C4ST-1 mainly exists as inclusion bodies in E. coli. To increase the soluble expression, the effects of co-expression of thiol oxidase (Erv1p) and C4ST-1 or C4ST-1 and disulfide isomerase (DsbC) were investigated. The results showed that co-expression of DsbC significantly increased the expression level of intracellular soluble protein while no significant effect was observed for co-expression of Erv1p. Co-expression of C4ST-1 and Erv1p, or C4ST-1 and DsbC increased the enzyme activities to (12.32±0.76) U/L and (21.99±0.42) U/L, which were 1.30 and 2.33 times of that of the original strain, respectively. Then, C4ST-1, Erv1p and DsbC were co-expressed and the enzyme activities in shake flask and 3 L fermenter were improved to (29.12±0.66) U/L and 49.97 U/L, respectively. The present study provides a solid foundation for further applications.

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李青,周正雄,堵国成,李江华,康振. C4ST-1在大肠杆菌中的可溶性表达[J].食品与生物技术学报,2020,39(6):68-75.

LI Qing, ZHOU Zhengxiong, DU Guocheng, LI Jianghua, KANG Zhen. Soluble Expression of C4ST-1 in Escherichia coli[J]. Journal of Food Science and Biotechnology,2020,39(6):68-75.

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  • 在线发布日期: 2020-10-20
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