Structural basis for phosphorylation-dependent recruitment of Tel2 to Hsp90 by Pih1.

Structural basis for phosphorylation-dependent recruitment of Tel2 to Hsp90 by Pih1.
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DOI:
10.1016/j.str.2014.04.001
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发表时间:
2014-06-10
期刊:
影响因子:
5.7
通讯作者:
Prodromou, Chrisostomos
Prodromou, Chrisostomos
中科院分区:
生物学2区
文献类型:
--
作者:
Pal, Mohinder;Morgan, Marc;Phelps, Sarah E. L.;Roe, S. Mark;Parry-Morris, Sarah;Downs, Jessica A.;Polier, Sigrun;Pearl, Laurence H.;Prodromou, Chrisostomos

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客户蛋白向 Hsp90 系统的招募取决于同时结合客户和 Hsp90 并促进它们相互作用的共伴侣。 Hsp90 参与 snoRNP、RNA 聚合酶、PI3 激酶样激酶和染色质重塑复合物的组装取决于 TTT (Tel2-Tti1-Tti2) 和 R2TP 复合物,由 AAA-ATPase Rvb1 和 Rvb2、Tah1(后生动物中的 Spagh/RPAP3)和 Pih1(后生动物中的 Pih1D1)组成。人类)——它们共同提供了与 Hsp90 的连接。 R2TP 功能背后的生物化学仍然知之甚少。特别是 Pih1,它是复合物的核心,尚未在结构水平上得到描述,也没有表征它介导的多种蛋白质-蛋白质相互作用。在这里,我们对 Hsp90-Tah1-Pih1、Hsp90-Spagh 和 Pih1D1-Tel2 复合物进行了结构和生化分析,揭示了 Pih1D1 中特异性结合 CK2 磷酸化位点的结构域,并共同定义了 R2TP 复合物将 Hsp90 伴侣系统与 TTT 复合物连接的结构基础。 Pih1 中的 CS 结构域结合 Tah1 的天然非结构化区域 两个 Tah1 分子结合占据两个 C 端结合位点的 Hsp90 Spagh/RPAP3 通过同一多肽链内的两个串联 TPR 结构域结合 Hsp90 Pih1D1 通过对 CK2 磷酸化位点特异的 PIH 结构域结合 Tel2 Hsp90-Tah1-Pih1、Hsp90-Spagh、 Pal 等人报道的 Pih1D1-Tel2 复合物。揭示了 Pih1D1 中特异性结合 CK2 磷酸化位点的结构域,并定义了 R2TP 复合物将 Hsp90 伴侣系统与 TTT 复合物连接的结构基础。
Client protein recruitment to the Hsp90 system depends on cochaperones that bind the client and Hsp90 simultaneously and facilitate their interaction. Hsp90 involvement in the assembly of snoRNPs, RNA polymerases, PI3-kinase-like kinases, and chromatin remodeling complexes depends on the TTT (Tel2-Tti1-Tti2), and R2TP complexes—consisting of the AAA-ATPases Rvb1 and Rvb2, Tah1 (Spagh/RPAP3 in metazoa), and Pih1 (Pih1D1 in humans)—that together provide the connection to Hsp90. The biochemistry underlying R2TP function is still poorly understood. Pih1 in particular, at the heart of the complex, has not been described at a structural level, nor have the multiple protein-protein interactions it mediates been characterized. Here we present a structural and biochemical analysis of Hsp90-Tah1-Pih1, Hsp90-Spagh, and Pih1D1-Tel2 complexes that reveal a domain in Pih1D1 specific for binding CK2 phosphorylation sites, and together define the structural basis by which the R2TP complex connects the Hsp90 chaperone system to the TTT complex. A CS domain in Pih1 binds a natively unstructured region of Tah1 Two molecules of Tah1 bind Hsp90 occupying both C-terminal binding sites Spagh/RPAP3 binds Hsp90 via two tandem TPR domains within the same polypeptide chain Pih1D1 binds Tel2 via a PIH domain specific for CK2 phosphorylation sites Structural and biochemical analyses of Hsp90-Tah1-Pih1, Hsp90-Spagh, and Pih1D1-Tel2 complexes reported by Pal et al. reveal a domain in Pih1D1 specific for binding CK2 phosphorylation sites and define the structural basis by which the R2TP complex connects the Hsp90 chaperone system to the TTT complex.
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