Cloning and characterization of a haloarchaeal heat shock protein 70 functionally expressed in Escherichia coli.

Cloning and characterization of a haloarchaeal heat shock protein 70 functionally expressed in Escherichia coli.
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在大肠杆菌中功能表达的盐古菌热休克蛋白 70 的克隆和表征。

DOI:
10.1111/j.1574-6968.2007.00881.x
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发表时间:
2007-10
影响因子:
2.1
通讯作者:
--
中科院分区:
生物学4区
文献类型:
--
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Hsp 70分子伴侣由70-kDa热休克蛋白Hsp 70(DnaK)、辅伴侣蛋白Hsp 40(DnaJ)和核苷酸交换因子GrpE构成。虽然它是最具特征的分子伴侣机器之一,但在古细菌中对其知之甚少。从Natrinema sp.J7菌株中克隆了一个含有hsp 70(dnaK)基因的5.2kb片段,并进行了序列测定。它含有Hsp 70分子伴侣机器基因位点,按grpE、hsp 70和hsp 40(dnaJ)的顺序单向排列。将产自Natrinema sp.J7的hsp 70基因在大肠杆菌BL 21(DE 3)中高效表达。重组Hsp 70蛋白是一种可溶性的活性蛋白,其ATP酶活性在2.0 M KCl中最佳,而NaCl的影响较小。在体内,盐古菌hsp 70基因允许E.大肠杆菌dnak无效突变体繁殖λ噬菌体并在42摄氏度下生长。结果表明,盐古菌Hsp 70可能有利于极端嗜盐菌在低盐环境中的生存。
The Hsp70 molecular chaperone machine is constituted by the 70-kDa heat shock protein Hsp70 (DnaK), cochaperone protein Hsp40 (DnaJ) and a nucleotide-exchange factor GrpE. Although it is one of the best-characterized molecular chaperone machines, little is known about it in archaea. A 5.2-kb region containing the hsp70 (dnaK) gene was cloned from Natrinema sp. J7 strain and sequenced. It contained the Hsp70 chaperone machine gene locus arranged unidirectionally in the order of grpE, hsp70 and hsp40 (dnaJ). The hsp70 gene from Natrinema sp. J7 was overexpressed in Escherichia coli BL21 (DE3). The recombinant Hsp70 protein was in a soluble and active form, and its ATPase activity was optimally active in 2.0 M KCl, whereas NaCl had less effect. In vivo, the haloarchaeal hsp70 gene allowed an E. coli dnak-null mutant to propagate lambda phages and grow at 42 degrees C. The results suggested that haloarchaeal Hsp70 should be beneficial for extreme halophiles survival in low-salt environments.
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