Expression and function of two chaperone proteins, AtGroEL and AtGroES, from Acidithiobacillus ferrooxidans ATCC 23270

Expression and function of two chaperone proteins, AtGroEL and AtGroES, from Acidithiobacillus ferrooxidans ATCC 23270
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氧化亚铁硫杆菌 ATCC 23270 中两种伴侣蛋白 AtGroEL 和 AtGroES 的表达和功能

DOI:
10.1007/s11274-011-0781-8
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发表时间:
2011-05
影响因子:
4.1
通讯作者:
Qiu, Guanzhou
Qiu, Guanzhou
中科院分区:
工程技术3区
文献类型:
--
作者:
Qin, Wenqing;Huang, Qiuxia;Zhu, Jianyu;Yang, Peng;Yu, Runlan;Li, Jiaokun;Liu, Xueduan;Qiu, Guanzhou

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使用 pLM1 表达载体将分别编码酸性氧化亚铁硫杆菌 Hsp60 (AtGroEL) 和 Hsp10 (AtGroES) 的两个分子伴侣基因引入大肠杆菌中。然后AtGroEL和AtGroES蛋白在大肠杆菌BL21(DE3)中成功过表达,并通过一步固定化金属亲和层析纯化。 ATPase 检测显示蛋白质处于活性状态,AtGroEL 的 ATPase 活性具有温度依赖性,最适温度为 50°C,但辅助伴侣 AtGroES 抑制 AtGroEL 的 ATPase 活性。使用三种不同的蛋白底物体外检测重组蛋白的伴侣蛋白功能,结果表明AtGroEL/AtGroES伴侣系统可以促进热变性rusticyanin的重折叠并恢复热变性ArsH蛋白的活性。此外,它还可以提高木聚糖酶的热稳定性。 AtGroEL 蛋白的分子模型显示,Tyr199、Ser201、Tyr203、Phe204、Leu234、Leu237、Leu259、Val263 和 Val264 残基对于结合变性多肽是必需的。
Two molecular chaperone genes encoding the Acidithiobacillus ferrooxidans Hsp60 (AtGroEL) and Hsp10 (AtGroES), respectively were introduced into Escherichia coli using the pLM1 expression vector. Then the AtGroEL and AtGroES proteins were overexpressed successfully in Escherichia coli BL21 (DE3), and purified by one-step immobilized metal affinity chromatography. The ATPase assay showed that the proteins were in active form, and the ATPase activity of AtGroEL was temperature dependent with an optimal temperature of 50°C, but the co-chaperonin AtGroES inhibited the ATPase activity of AtGroEL. The chaperonin function of the recombinant proteins was examined using three different protein substrates in vitro, and the results showed that AtGroEL/AtGroES chaperone system could facilitate the refolding of the thermodenatured rusticyanin and recover the activity of thermodenatured ArsH protein. In addition, it could improve the thermal stability of xylanase. Molecular modelling for AtGroEL protein revealed that residues of Tyr199, Ser201, Tyr203, Phe204, Leu234, Leu237, Leu259, Val263 and Val264 were necessary for binding the denatured polypeptides.
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影响因子: 4.1
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DOI: 10.1038/41944
发表时间: 1997-08-21
期刊: NATURE
影响因子: 64.8
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