GNL3L stabilizes the TRF1 complex and promotes mitotic transition.

GNL3L stabilizes the TRF1 complex and promotes mitotic transition.
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DOI:
10.1083/jcb.200812121
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发表时间:
2009-06-01
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Tsai RY
Tsai RY
中科院分区:
其他
文献类型:
--
作者:
Zhu Q;Meng L;Hsu JK;Lin T;Teishima J;Tsai RY

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端粒重复结合因子1 (TRF1)是多蛋白复合物“庇护蛋白”的一个组成部分,它将端粒组织成一个高阶结构。TRF1基因敲除胚胎会出现严重的生长缺陷,但端粒功能不明显,这表明TRF1在细胞周期控制中具有强制性作用。迄今为止,TRF1蛋白表达增加的调控机制及其在有丝分裂中的作用尚不清楚。在这里,我们发现鸟嘌呤核苷酸结合蛋白样3 (GNL3L)是一种与核干蛋白最相似的gtp结合蛋白,是一种新的trf1相互作用蛋白。GNL3L在核质中结合TRF1,能够促进TRF1的同二聚化和端粒结合,阻止早幼粒细胞白血病体募集端粒结合的TRF1,并通过抑制TRF1的泛素化和与TRF1的E3泛素连接酶FBX4结合来稳定TRF1蛋白。最重要的是,GNL3L的TRF1蛋白稳定活性介导了TRF1蛋白的有丝分裂增加,促进了中期到后期的转变。这项工作揭示了GNL3L调制TRF1的新方面。
Telomeric repeat binding factor 1 (TRF1) is a component of the multiprotein complex “shelterin,” which organizes the telomere into a high-order structure. TRF1 knockout embryos suffer from severe growth defects without apparent telomere dysfunction, suggesting an obligatory role for TRF1 in cell cycle control. To date, the mechanism regulating the mitotic increase in TRF1 protein expression and its function in mitosis remains unclear. Here, we identify guanine nucleotide-binding protein-like 3 (GNL3L), a GTP-binding protein most similar to nucleostemin, as a novel TRF1-interacting protein in vivo. GNL3L binds TRF1 in the nucleoplasm and is capable of promoting the homodimerization and telomeric association of TRF1, preventing promyelocytic leukemia body recruitment of telomere-bound TRF1, and stabilizing TRF1 protein by inhibiting its ubiquitylation and binding to FBX4, an E3 ubiquitin ligase for TRF1. Most importantly, the TRF1 protein-stabilizing activity of GNL3L mediates the mitotic increase of TRF1 protein and promotes the metaphase-to-anaphase transition. This work reveals novel aspects of TRF1 modulation by GNL3L.
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