Interactions between the GroE Chaperonins and Rhodanese

Interactions between the GroE Chaperonins and Rhodanese
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GroE Chaperonins 和 Rhodanese 之间的相互作用

DOI:
--
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发表时间:
1995
影响因子:
4.8
通讯作者:
M. Fisher
M. Fisher
中科院分区:
生物学2区
文献类型:
--
作者:
Kirk E. Smith;M. Fisher

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使用分子伴侣GroE系统有效复性尿素变性的罗丹明需要GroEL、GroES和ATP。在高浓度下,这种复性还要求底物硫代硫酸盐在GroEL-罗丹络合物形成过程中存在。在硫代硫酸盐存在下,GroEL-罗丹明络合物可以被浓缩到1 mg/ml以上,而对复性效率几乎没有影响。然而,如果在没有硫代硫酸盐的情况下形成络合物,则在硫代硫酸盐存在下,罗丹明的复性临界浓度约为0.4 mg/ml,超过此值,复性产率急剧下降。这一临界浓度似乎与罗丹明的折叠过程中的聚集事件有关。GroEL的无核苷酸或ADP结合形式也与已经变性或从未变性的罗丹明结合。结合的罗丹明没有活性,但可以从GroEL中释放出来,ATP恢复到对照活性的90%。本文提供的数据支持GroE辅助的罗丹明重折叠的释放和重结合机制。这也表明GroEL在整个复性过程中结合了几个蛋白质折叠中间体。
Efficient renaturation of urea-denatured rhodanese using the chaperonin GroE system requires GroEL, GroES, and ATP. At high concentrations this renaturation also requires the substrate thiosulfate to have been present during GroEL-rhodanese complex formation. When thiosulfate is present the GroEL-rhodanese complex can be concentrated to greater than 1 mg/ml rhodanese with little effect on the efficiency of renaturation. However, if complex is formed in the absence of thiosulfate, renaturation of rhodanese in the presence of thiosulfate shows a critical concentration of approximately 0.4 mg/ml, above which renaturation yields drop dramatically. This critical concentration appears to be related to an aggregation event in the refolding of rhodanese. The nucleotide free or ADP-bound form of GroEL also binds to rhodanese that has been either already renatured or never denatured. The bound rhodanese has no activity but can be released from GroEL with ATP recovering 90% of control activity. The data presented herein support a release and rebinding mechanism for the GroE-assisted refolding of rhodanese. It also suggests GroEL binds several protein folding intermediates along the entire refolding pathway.
DOI: 10.1021/bi00244a001
发表时间: 1991-07
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影响因子: 2.9
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在 groE 伴侣蛋白存在下,硫氰酸酶和谷氨酰胺合成酶的复性速率。
DOI: --
发表时间: 1994
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影响因子: --
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在 ATP 和 ADP 存在的情况下,groES 对十二聚谷氨酰胺合成酶的 groEL 依赖性组装的影响。
DOI: --
发表时间: 1994
期刊: The Journal of biological chemistry
影响因子: --
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