Folding of Toll-like receptors by the HSP90 paralogue gp96 requires a substrate-specific cochaperone.

Folding of Toll-like receptors by the HSP90 paralogue gp96 requires a substrate-specific cochaperone.
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DOI:
10.1038/ncomms1070
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发表时间:
2010-09-21
影响因子:
16.6
通讯作者:
Li, Zihai
Li, Zihai
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Liu, Bei;Yang, Yi;Qiu, Zhijuan;Staron, Matthew;Hong, Feng;Li, Yi;Wu, Shuang;Li, Yunfeng;Hao, Bing;Bona, Robert;Han, David;Li, Zihai

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胞质HSP 90在折叠客户蛋白时需要多个辅伴侣。然而,gp 96(HSP 90 b1,grp 94)是内质网(ER)中的一种HSP 90蛋白,其功能被认为不依赖于辅伴侣。在这里,我们表明,gp 96伴侣多种Toll样受体(TLR),但不是TLR 3,在某种程度上,是依赖于另一个ER管腔蛋白,CNPY 3。gp 96直接与CNPY 3相互作用,并且该复合物在三磷酸腺苷(ATP)的存在下解离。gp 96-CNPY 3相互作用的遗传破坏完全消除了它们的TLR伴侣功能。此外,我们证明了TLR 9与gp 96和CNPY 3形成多分子复合物,并且TLR 9与任一分子的结合需要另一分子的存在。我们认为CNPY 3与gp 96的ATP敏感构象相互作用以促进底物加载。因此,我们的研究已经确定CNPY 3作为gp 96的TLR特异性辅伴侣。 Toll样受体参与先天免疫系统的病原体识别,并依赖于分子伴侣gp 96进行正确折叠。在这篇文章中,伴侣活性的gp 96被证明是依赖于一个额外的内质网蛋白,CNPY 3,一些Toll样受体。
Cytosolic HSP90 requires multiple cochaperones in folding client proteins. However, the function of gp96 (HSP90b1, grp94), an HSP90 paralogue in the endoplasmic reticulum (ER), is believed to be independent of cochaperones. Here, we demonstrate that gp96 chaperones multiple Toll-like receptors (TLRs), but not TLR3, in a manner that is dependent on another ER luminal protein, CNPY3. gp96 directly interacts with CNPY3, and the complex dissociates in the presence of adenosine triphosphate (ATP). Genetic disruption of gp96–CNPY3 interaction completely abolishes their TLR chaperone function. Moreover, we demonstrate that TLR9 forms a multimolecular complex with gp96 and CNPY3, and the binding of TLR9 to either molecule requires the presence of the other. We suggest that CNPY3 interacts with the ATP-sensitive conformation of gp96 to promote substrate loading. Our study has thus established CNPY3 as a TLR-specific cochaperone for gp96. Toll-like receptors are involved in pathogen recognition by the innate immune system and rely on the molecular chaperone, gp96, for correct folding. In this article, the chaperone activity of gp96 is shown to be dependent on an additional endoplasmic reticulum protein, CNPY3, for some Toll-like receptors.
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