Subcellular localisation modulates ubiquitylation and degradation of Ascl1.

Subcellular localisation modulates ubiquitylation and degradation of Ascl1.
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DOI:
10.1038/s41598-018-23056-4
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发表时间:
2018-03-15
期刊:
影响因子:
4.6
通讯作者:
Philpott A
Philpott A
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Gillotin S;Davies JD;Philpott A

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前神经转录因子Ascl 1是中枢神经系统中神经发生、协调增殖和分化的主要调节因子。虽然它的表达是很好的特点,翻译后调控是少得多的理解。在这里,我们证明了一个人口的染色质结合Ascl 1可以发现与短链的泛素,而细胞质Ascl 1窝藏更长的泛素链。只有细胞质泛素化靶向Ascl 1进行破坏,这是通过泛素与Ascl 1的基本螺旋-环-螺旋结构域中的赖氨酸缀合而发生的,并且需要E3连接酶Huwe 1。与此相反,染色质结合的Ascl 1与短泛素链相关,可以发生在N-末端区域或bHLH结构域内的赖氨酸上,不受Huwe 1介导,不被泛素介导的破坏所靶向。因此,我们提供了进一步的见解Ascl 1的翻译后调节,突出了细胞质和染色质中的泛素化和降解的复杂调节。
The proneural transcription factor Ascl1 is a master regulator of neurogenesis, coordinating proliferation and differentiation in the central nervous system. While its expression is well characterised, post-translational regulation is much less well understood. Here we demonstrate that a population of chromatin-bound Ascl1 can be found associated with short chains of ubiquitin while cytoplasmic Ascl1 harbours much longer ubiquitin chains. Only cytoplasmic ubiquitylation targets Ascl1 for destruction, which occurs by conjugation of ubiquitin to lysines in the basic helix-loop-helix domain of Ascl1 and requires the E3 ligase Huwe1. In contrast, chromatin-bound Ascl1 associated with short ubiquitin-chains, which can occur on lysines within the N-terminal region or the bHLH domain and is not mediated by Huwe1, is not targeted for ubiquitin-mediated destruction. We therefore offer further insights into post-translational regulation of Ascl1, highlighting complex regulation of ubiquitylation and degradation in the cytoplasm and on chromatin.
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