Substrate selection by the proteasome during degradation of protein complexes.

Substrate selection by the proteasome during degradation of protein complexes.
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蛋白质复合物降解过程中蛋白酶体的底物选择。

DOI:
10.1038/nchembio.130
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发表时间:
2009-01
影响因子:
14.8
通讯作者:
Matouschek, Andreas
Matouschek, Andreas
中科院分区:
生物学1区
文献类型:
--
作者:
Prakash, Sumit;Inobe, Tomonao;Hatch, Ace Joseph;Matouschek, Andreas

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蛋白酶体控制大多数细胞蛋白质的周转。蛋白质降解通常需要两个结构特征:共价连接的泛素多肽允许与蛋白酶体结合,以及目标蛋白质中启动蛋白质水解的非结构化区域。在这里,我们测试了模型蛋白的降解,以进一步探索蛋白酶体如何选择其底物。在细胞裂解液中使用纯化的酵母蛋白酶体和哺乳动物蛋白酶体,我们已经证明,当分离到多亚基复合物中的不同蛋白质上时,这两种结构特征可以反式作用。在这种复合物中,非结构化起始位点的位置及其化学性质决定了哪个亚基被降解。因此,我们的发现揭示了亚基特异性在蛋白质复合物降解中的分子基础。此外,我们的数据为接头蛋白如何与其他稳定的蛋白结合并靶向它们进行降解提供了一个合理的解释。
The proteasome controls the turnover of most cellular proteins. Two structural features are typically required for proteins to be degraded: covalently attached ubiquitin polypeptides that allow binding to the proteasome, and an unstructured region in the targeted protein that initiates proteolysis. Here, we have tested the degradation of model proteins to further explore how the proteasome selects its substrates. Using purified yeast proteasome and mammalian proteasome in cell lysate, we have demonstrated that the two structural features can act in trans when separated onto different proteins in a multi-subunit complex. In such complexes, the location of the unstructured initiation site and its chemical properties determine which subunit is degraded. Thus, our findings reveal the molecular basis of subunit specificity in the degradation of protein complexes. In addition, our data provide a plausible explanation for how adaptor proteins can bind to otherwise stable proteins and target them for degradation.
DOI: 10.1016/0092-8674(90)90481-s
发表时间: 1990-05-18
期刊: CELL
影响因子: 64.5
作者:
HOCHSTRASSER, M;VARSHAVSKY, A
通讯作者: VARSHAVSKY, A
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期刊: BIOCHEMISTRY
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期刊: BIOCHEMISTRY
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DOI: 10.1002/j.1460-2075.1996.tb00668.x
发表时间: 1996-06-17
期刊: EMBO JOURNAL
影响因子: 11.4
作者:
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通讯作者: Hunt, T