Dyskerin, tRNA genes, and condensin tether pericentric chromatin to the spindle axis in mitosis.

Dyskerin, tRNA genes, and condensin tether pericentric chromatin to the spindle axis in mitosis.
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DOI:
10.1083/jcb.201405028
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发表时间:
2014-10-27
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Bloom K
Bloom K
中科院分区:
其他
文献类型:
--
作者:
Snider CE;Stephens AD;Kirkland JG;Hamdani O;Kamakaka RT;Bloom K

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凝析蛋白与tRNA基因和与tRNA相互作用的蛋白dyskerin相互作用介导了出芽酵母染色体上凝析蛋白的中心周围富集,有助于染色质的压实和有丝分裂纺锤体的结构和完整性。凝集蛋白富集于出芽酵母染色体的中粒,在中期被限制在纺锤轴上。中心周围凝聚蛋白有助于染色质压实,对基于微管的纺锤体力的抵抗,以及纺锤体长度和变异调节。凝缩蛋白沿着纺锤轴以异质方式聚集。我们证明凝缩蛋白的中心周围富集是通过与转移核糖核酸(tRNA)基因及其调控因子的相互作用介导的。这种招募对于产生轴向张力和协调来自不同染色体的周粒之间的运动是重要的。凝缩蛋白和tRNA基因在着丝粒内的相互作用揭示了酵母着丝粒的一个特征,这对有丝分裂分离机制的功能和进化具有深远的意义。
Pericentric enrichment of condensin on budding yeast chromosomes, which contributes to chromatin compaction and mitotic spindle structure and integrity, is mediated by condensin interaction with tRNA genes and the tRNA-interacting protein dyskerin. Condensin is enriched in the pericentromere of budding yeast chromosomes where it is constrained to the spindle axis in metaphase. Pericentric condensin contributes to chromatin compaction, resistance to microtubule-based spindle forces, and spindle length and variance regulation. Condensin is clustered along the spindle axis in a heterogeneous fashion. We demonstrate that pericentric enrichment of condensin is mediated by interactions with transfer ribonucleic acid (tRNA) genes and their regulatory factors. This recruitment is important for generating axial tension on the pericentromere and coordinating movement between pericentromeres from different chromosomes. The interaction between condensin and tRNA genes in the pericentromere reveals a feature of yeast centromeres that has profound implications for the function and evolution of mitotic segregation mechanisms.
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