Assembly mechanism of early Hsp90-Cdc37-kinase complexes.

Assembly mechanism of early Hsp90-Cdc37-kinase complexes.
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早期hsp90 - cdc37激酶复合物的组装机制。

DOI:
10.1126/sciadv.abm9294
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发表时间:
2022-03-18
期刊:
影响因子:
13.6
通讯作者:
Gelis I
Gelis I
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Keramisanou D;Vasantha Kumar MV;Boose N;Abzalimov RR;Gelis I

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分子伴侣对于维持蛋白质平衡具有重要作用。在这里,我们研究如何招募蛋白激酶和加载到热休克蛋白90-Cdc 37复合物,在热休克蛋白90介导的伴侣,导致增强客户激酶的稳定性和激活的第一步。我们表明,所有合作伙伴的构象动力学是一个重要的功能的基本加载机制。激酶组共分子伴侣Cdc 37主要存在于动态扩展构象中,但样品为低填充的、明确定义的紧凑结构。这两种状态之间的交换维持在组装的Hsp 90-Cdc 37复合物中,并且对于底物装载是必需的。呼吸运动在N-叶的自由激酶结构域部分暴露的激酶节段被困在热休克蛋白90二聚体下游的周期。因此,客户动态平衡伴侣依赖。Hsp 90在加载期间不直接参与,Cdc 37被分配通过稳定预先存在的部分展开的客户端状态来感测客户端的任务。构象动力学促进激酶加载到Hsp 90。
Molecular chaperones have an essential role for the maintenance of a balanced protein homeostasis. Here, we investigate how protein kinases are recruited and loaded to the Hsp90-Cdc37 complex, the first step during Hsp90-mediated chaperoning that leads to enhanced client kinase stability and activation. We show that conformational dynamics of all partners is a critical feature of the underlying loading mechanism. The kinome co-chaperone Cdc37 exists primarily in a dynamic extended conformation but samples a low-populated, well-defined compact structure. Exchange between these two states is maintained in an assembled Hsp90-Cdc37 complex and is necessary for substrate loading. Breathing motions at the N-lobe of a free kinase domain partially expose the kinase segment trapped in the Hsp90 dimer downstream in the cycle. Thus, client dynamics poise for chaperone dependence. Hsp90 is not directly involved during loading, and Cdc37 is assigned the task of sensing clients by stabilizing the preexisting partially unfolded client state. Conformational dynamics facilitate kinase loading to Hsp90.
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