Multivalent protein-protein interactions are pivotal regulators of eukaryotic Hsp70 complexes.

Multivalent protein-protein interactions are pivotal regulators of eukaryotic Hsp70 complexes.
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多价蛋白质-蛋白质相互作用是真核Hsp 70复合物的关键调节因子。

DOI:
10.1007/s12192-022-01281-1
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发表时间:
2022-07
影响因子:
3.8
通讯作者:
Gestwicki, Jason E.
Gestwicki, Jason E.
中科院分区:
生物学3区
文献类型:
--
作者:
Johnson, Oleta T.;Gestwicki, Jason E.

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热休克蛋白70(Heat shock protein 70,Hsp 70)是一种分子伴侣,是蛋白质稳态的重要调节因子。Hsp 70与客户蛋白和辅助分子伴侣结合产生独特的复合物,因此理解Hsp 70的蛋白质-蛋白质相互作用(PPI)是描述其在疾病中的功能和功能障碍的基础。越来越多的证据表明,这些PPI既包括普遍保守的“规范”相互作用,也包括似乎在真核生物中出现的“非规范”(或“二级”)接触。这两类相互作用涉及离散的结合表面,使得一些客户端和共分子伴侣以至少两个接触点接合Hsp 70。虽然典型相互作用对分子伴侣功能的贡献越来越清楚,但要解卷积次级相互作用的作用可能具有挑战性。在这里,我们回顾什么是已知的非典型的接触和突出的例子,他们的贡献已被解析,从而产生一个模型,其中Hsp 70的二级接触不只是网站的额外的亲和力,但必要和足够的赋予独特的功能。从这个角度来看,我们建议,进一步探索非典型的接触将产生重要的见解Hsp 70系统的演变,并激发新的方法来开发小分子,调整Hsp 70介导的蛋白酶抑制。
Heat shock protein 70 (Hsp70) is a molecular chaperone and central regulator of protein homeostasis (proteostasis). Paramount to this role is Hsp70’s binding to client proteins and co-chaperones to produce distinct complexes, such that understanding the protein–protein interactions (PPIs) of Hsp70 is foundational to describing its function and dysfunction in disease. Mounting evidence suggests that these PPIs include both “canonical” interactions, which are universally conserved, and “non-canonical” (or “secondary”) contacts that seem to have emerged in eukaryotes. These two categories of interactions involve discrete binding surfaces, such that some clients and co-chaperones engage Hsp70 with at least two points of contact. While the contributions of canonical interactions to chaperone function are becoming increasingly clear, it can be challenging to deconvolute the roles of secondary interactions. Here, we review what is known about non-canonical contacts and highlight examples where their contributions have been parsed, giving rise to a model in which Hsp70’s secondary contacts are not simply sites of additional avidity but are necessary and sufficient to impart unique functions. From this perspective, we propose that further exploration of non-canonical contacts will generate important insights into the evolution of Hsp70 systems and inspire new approaches for developing small molecules that tune Hsp70-mediated proteostasis.
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