Ubiquitin crosstalk connecting cellular processes.

Ubiquitin crosstalk connecting cellular processes.
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DOI:
10.1186/1747-1028-1-21
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发表时间:
2006-09-28
期刊:
影响因子:
2.3
通讯作者:
Salomons FA
Salomons FA
中科院分区:
生物学3区
文献类型:
--
作者:
Groothuis TA;Dantuma NP;Neefjes J;Salomons FA

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多肽泛素用于许多不同的过程,如内吞作用、多泡体形成和基因转录调节。这些过程中通常使用单个泛素部分的缀合。需要泛素部分的聚合物来标记蛋白质以进行蛋白酶体降解。除了在蛋白质降解中的作用外,泛素还以单聚体或多聚体的形式参与细胞内信号传导和 DNA 修复。由于游离泛素在细胞中的存在量有限,因此任何这些过程中对泛素需求的变化都可能间接影响其他泛素修饰。例如,蛋白毒性应激以单泛素化组蛋白为代价强烈增加多泛素化蛋白,导致染色质重塑和转录改变。在这里,我们讨论泛素依赖性过程之间的相互联系,并推测泛素平衡作为将细胞应激转化为分子反应的信号传导途径的功能意义。
The polypeptide ubiquitin is used in many processes as different as endocytosis, multivesicular body formation, and regulation of gene transcription. Conjugation of a single ubiquitin moiety is typically used in these processes. A polymer of ubiquitin moieties is required for tagging proteins for proteasomal degradation. Besides its role in protein degradation, ubiquitin is also engaged as mono- or polymer in intracellular signalling and DNA repair. Since free ubiquitin is present in limiting amounts in cells, changes in the demands for ubiquitin in any of these processes is likely to indirectly affect other ubiquitin modifications. For example, proteotoxic stress strongly increases poly-ubiquitylated proteins at the cost of mono-ubiquitylated histones resulting in chromatin remodelling and altered transcription. Here we discuss the interconnection between ubiquitin-dependent processes and speculate on the functional significance of the ubiquitin equilibrium as a signalling route translating cellular stress into molecular responses.
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