Allosteric opening of the polypeptide-binding site when an Hsp70 binds ATP.

Allosteric opening of the polypeptide-binding site when an Hsp70 binds ATP.
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DOI:
10.1038/nsmb.2583
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发表时间:
2013-07
影响因子:
16.8
通讯作者:
Liu, Qinglian
Liu, Qinglian
中科院分区:
生物学1区
文献类型:
--
作者:
Qi, Ruifeng;Sarbeng, Evans Boateng;Liu, Qun;Le, Katherine Quynh;Xu, Xinping;Xu, Hongya;Yang, Jiao;Wong, Jennifer Li;Vorvis, Christina;Hendrickson, Wayne A.;Zhou, Lei;Liu, Qinglian

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70 kD热休克蛋白(Hsp 70)是一种广泛存在的分子伴侣,在细胞内蛋白质折叠和蛋白质稳定过程中起重要作用。每个Hsp 70具有两个功能结构域:结合并水解ATP的核苷酸结合结构域(NBD)和结合延伸多肽的底物结合结构域(SBD)。当在ADP中时,NBD和SBD很少相互作用;然而,ATP结合变构地偶联多肽和ATP结合位点。ATP结合促进多肽释放;多肽再结合刺激ATP水解。这种变构偶联知之甚少。在这里,我们提出了一个完整的热休克蛋白70从大肠杆菌在ATP结合状态的晶体结构在1.96毫微米分辨率。NBD-ATP具有独特的构象,与α-螺旋盖移位和β-亚结构域多肽结合通道重构的SBD形成广泛的界面。这些构象变化与我们的生化测试提供了一个长期寻求的结构解释热休克蛋白70活性的变构偶联。
The 70kD heat shock proteins (Hsp70s) are ubiquitous molecular chaperones essential for cellular protein folding and proteostasis. Each Hsp70 has two functional domains: a nucleotide-binding domain (NBD) that binds and hydrolyzes ATP, and a substrate-binding domain (SBD) that binds extended polypeptides. NBD and SBD interact little when in ADP; however, ATP binding allosterically couples the polypeptide- and ATP-binding sites. ATP binding promotes polypeptide release; polypeptide rebinding stimulates ATP hydrolysis. This allosteric coupling is poorly understood. Here we present the crystal structure of an intact Hsp70 from Escherichia coli in an ATP-bound state at 1.96 Å resolution. NBD-ATP adopts a unique conformation, forming extensive interfaces with a radically changed SBD that has its α-helical lid displaced and the polypeptide-binding channel of its β-subdomain restructured. These conformational changes together with our biochemical tests provide a long-sought structural explanation for allosteric coupling in Hsp70 activity.
DOI: 10.1107/s090744491003982x
发表时间: 2011-04
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作者:
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