Proteasomal degradation from internal sites favors partial proteolysis via remote domain stabilization.

Proteasomal degradation from internal sites favors partial proteolysis via remote domain stabilization.
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内部部位的蛋白酶体降解通过远程结构域稳定有利于部分蛋白水解。

DOI:
10.1021/cb2002285
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发表时间:
2011-10-21
影响因子:
4
通讯作者:
Matouschek, Andreas
Matouschek, Andreas
中科院分区:
生物学2区
文献类型:
--
作者:
Kraut, Daniel A.;Matouschek, Andreas

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泛素-蛋白酶体系统控制着数百种调控蛋白的浓度,并去除真核细胞中错误折叠和受损的蛋白。蛋白酶体识别泛素化的蛋白质,然后在非结构化起始区与底物接合。在启动后,它沿着多肽链进行,依次解开折叠的结构域,完全降解蛋白质。在体内,蛋白酶体可以,而且很可能经常这样做,在其底物内的内部位置启动降解,但尚不清楚这如何影响降解反应的结果。在这里,我们发现,在起始区两侧的结构域可以保护彼此免受降解,而不是直接相互作用。这种效应的大小与两个结构域的稳定性有关,可以从完全降解到完全保护一个结构域。在细胞中观察到了三条信号通路的部分蛋白酶体降解,并与内部启动有关。因此,蛋白质结构域远程稳定的基本生化机制在蛋白酶体生物学中具有重要意义。
The ubiquitin-proteasome system controls the concentrations of hundreds of regulatory proteins and removes misfolded and damaged proteins in eukaryotic cells. The proteasome recognizes ubiquitinated proteins and then engages its substrates at unstructured initiation regions. After initiation, it proceeds along the polypeptide chain, unraveling folded domains sequentially and degrading the protein completely. In vivo the proteasome can, and likely often does, initiate degradation at internal sites within its substrates but it is not known how this affects the outcome of the degradation reaction. Here we find that domains flanking the initiation region can protect each other against degradation without interacting directly. The magnitude of this effect is related to the stability of both domains and can be tuned from complete degradation to complete protection of one domain. Partial proteasomal degradation has been observed in the cell in three signaling pathways and is associated with internal initiation. Thus, the basic biochemical mechanism of remote stabilization of protein domains is important in proteasome biology.
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