Rootletin prevents Cep68 from VHL-mediated proteasomal degradation to maintain centrosome cohesion.

Rootletin prevents Cep68 from VHL-mediated proteasomal degradation to maintain centrosome cohesion.
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Rootletin 可防止 Cep68 受到 VHL 介导的蛋白酶体降解,以维持中心体凝聚力。

DOI:
10.1016/j.bbamcr.2017.01.007
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发表时间:
2017-04
期刊:
Biochimica et Biophysica Acta (BBA) – Molecular Cell Research
影响因子:
--
通讯作者:
Li Yuan
Li Yuan
中科院分区:
其他
文献类型:
--
作者:
Weixiao Liu;Dachuan Zhang;Wei Li;Li Yuan

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中心体凝聚力主要被认为是亲本中心粒之间的蛋白质连接物,它确保了间期中心体(S)作为单个微管组织中心的功能。中心体凝聚力的维持依赖于许多中心体连接蛋白,因为这些蛋白中的任何一个的耗尽都会导致中心体在间期过早分离,称为中心体分裂。然而,这种依赖的潜在机制尚不清楚。在这里,我们证明了Rootnote的缺失触发了von Hippel-Lindau肿瘤抑制蛋白(VHL)介导的Cep68蛋白酶体降解,进而导致中心体分裂。VHL E3连接酶复合体在体外和体内泛素化Cep68。联合沉默Rootlett和VHL可逆转Cep68丢失和中心体分裂。表达稳定的Cep68突变体,或者减少其多泛素化或消除与Vhl的β结构域的结合,也可以抑制由根公告耗尽引起的中心体分裂。我们认为,原型连接蛋白Rootlett部分通过抑制VHL介导的Cep68降解来维持中心体凝聚力。
Centrosome cohesion, mostly regarded as a proteinaceous linker between parental centrioles, ensures the interphase centrosome(s) to function as a single microtubule-organizing center. Maintenance of centrosome cohesion counts on a number of centrosomal linker proteins because depletion of any of those leads to premature centrosome separation in interphase, termed centrosome splitting. However, the underlying mechanisms of the dependence are unknown. Here, we show that absence of Rootletin triggers the von Hippel-Lindau tumour suppressor protein (VHL)-mediated proteasomal degradation of Cep68 and, in turn, results in centrosome splitting. The VHL E3 ligase complex ubiquitinates Cep68in vitroandin vivo. Co-silencing of Rootletin and VHL reverts Cep68 loss and centrosome splitting. Expression of a stable mutant of Cep68, either diminishing its polyubiquitylation or eliminating binding to β-domain of VHL, also suppresses centrosome splitting provoked by Rootletin depletion. We propose that the archetypal linker protein Rootletin maintains centrosome cohesion in part through inhibition of VHL-mediated Cep68 degradation.
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