The HSP70 chaperone machinery: J proteins as drivers of functional specificity.

The HSP70 chaperone machinery: J proteins as drivers of functional specificity.
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DOI:
10.1038/nrm2941
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发表时间:
2010-08
期刊:
Nature reviews. Molecular cell biology
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热休克蛋白70是一种普遍存在的分子伴侣,在许多生物学过程中发挥作用,调节多肽的折叠、降解和跨膜转运,以及蛋白质-蛋白质相互作用。这众多的角色是不容易调和的近一致性的Hsp 70的生化活性,一个ATP依赖性的客户端蛋白结合/释放周期。热休克蛋白70的功能多样性主要是由不同类型的辅因子,J蛋白(也称为热休克蛋白40)驱动的。通常,多个J蛋白与单个Hsp 70一起起作用。有些将Hsp 70的活性定位在细胞中的精确位置;其他人直接结合客户蛋白,从而将特定的客户交付给Hsp 70,直接决定它们的命运。
Hsp70s, ubiquitous molecular chaperones, function in a myriad of biological processes, modulating polypeptides’ folding, degradation and translocation across membranes, as well as protein-protein interactions. This multitude of roles is not easily reconciled with the near conformity of biochemical activity of Hsp70s, an ATP-dependent client protein binding/release cycle. Much of the functional diversity of Hsp70s is driven by a diverse class of cofactors, J-proteins (also called Hsp40s). Often, multiple J-proteins function with a single Hsp70. Some target Hsp70 activity to clients at precise locations in cells; others bind client proteins directly, thereby delivering specific clients to Hsp70, directly determining their fate.
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