The RPAP3-Cterminal domain identifies R2TP-like quaternary chaperones.

The RPAP3-Cterminal domain identifies R2TP-like quaternary chaperones.
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DOI:
10.1038/s41467-018-04431-1
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发表时间:
2018-05-29
影响因子:
16.6
通讯作者:
Bertrand E
Bertrand E
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Maurizy C;Quinternet M;Abel Y;Verheggen C;Santo PE;Bourguet M;C F Paiva A;Bragantini B;Chagot ME;Robert MC;Abeza C;Fabre P;Fort P;Vandermoere F;M F Sousa P;Rain JC;Charpentier B;Cianférani S;Bandeiras TM;Pradet-Balade B;Manival X;Bertrand E

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R2TP是HSP90共伴侣,可组装重要的大分子机器。它由 RPAP3-PIH1D1 异二聚体组成,可结合两种必需的 AAA+ATP 酶 RUVBL1/RUVBL2。在这里,我们解析了 RPAP3 保守 C 端结构域的结构,并表明它直接结合 RUVBL1/RUVBL2 六聚体。人类基因组编码另外两种带有 RPAP3-C 末端样结构域的蛋白质和三种含有 PIH 样结构域的蛋白质。系统相互作用分析表明,一种 RPAP3 样蛋白 SPAG1 与 PIH1D2 和 RUVBL1/2 结合,形成 R2TP 样复合物,称为 R2SP。这种辅助伴侣在睾丸中富集,在确定的 68 个潜在客户中,一些在睾丸中表达,另一些则普遍存在。一种底物是脂蛋白-α2,它组织大型信号复合物。值得注意的是,R2SP 是 liprin-α2 表达和 liprin-α2 复合物组装所必需的,这表明 R2SP 在四级蛋白质折叠中发挥作用。 32°C 时效果更强,表明 R2SP 可以帮助补偿睾丸的低温。 R2TP 是由 RPAP3-PIH1D1 异二聚体组成的 HSP90 共伴侣,可结合两种必需的 AAA+ ATP 酶 RUVBL1/RUVBL2。在这里,作者使用结构方法研究 RPAP3,并发现了一种 RPAP3 样蛋白 (SPAG1),该蛋白也与睾丸中富集的 PIH1D2 和 RUVBL1/2 形成共伴侣复合物。
R2TP is an HSP90 co-chaperone that assembles important macro-molecular machineries. It is composed of an RPAP3-PIH1D1 heterodimer, which binds the two essential AAA+ATPases RUVBL1/RUVBL2. Here, we resolve the structure of the conserved C-terminal domain of RPAP3, and we show that it directly binds RUVBL1/RUVBL2 hexamers. The human genome encodes two other proteins bearing RPAP3-C-terminal-like domains and three containing PIH-like domains. Systematic interaction analyses show that one RPAP3-like protein, SPAG1, binds PIH1D2 and RUVBL1/2 to form an R2TP-like complex termed R2SP. This co-chaperone is enriched in testis and among 68 of the potential clients identified, some are expressed in testis and others are ubiquitous. One substrate is liprin-α2, which organizes large signaling complexes. Remarkably, R2SP is required for liprin-α2 expression and for the assembly of liprin-α2 complexes, indicating that R2SP functions in quaternary protein folding. Effects are stronger at 32 °C, suggesting that R2SP could help compensating the lower temperate of testis. R2TP is an HSP90 co-chaperone composed of an RPAP3-PIH1D1 heterodimer, which binds two essential AAA+ ATPases RUVBL1/RUVBL2. Here authors use a structural approach to study RPAP3 and find an RPAP3-like protein (SPAG1) which also forms a co-chaperone complex with PIH1D2 and RUVBL1/2 enriched in testis.
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发表时间: 2014-04-01
期刊: CELL REPORTS
影响因子: 8.8
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发表时间: 1997-07-01
期刊: NATURE GENETICS
影响因子: 30.8
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