The elongation rate of RNA polymerase determines the fate of transcribed nucleosomes.

The elongation rate of RNA polymerase determines the fate of transcribed nucleosomes.
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DOI:
10.1038/nsmb.2164
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发表时间:
2011-11-13
影响因子:
16.8
通讯作者:
--
中科院分区:
生物学1区
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--
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转录后,组蛋白可以通过涉及模板循环的过程从DNA脱离或在聚合酶后面转移。转录过程中控制核小体命运的细节尚不清楚。我们RNA聚合酶II-核体复合物的原子力显微镜图像证实了循环转录中间体的存在,并通过转录的核小体位置的分布提供了对组蛋白转移过程的机械洞察力。值得注意的是,我们发现将转录的核小体的一部分重塑为六症,并且该部分取决于转录伸长率。一个简单的模型,涉及转录伸长,组蛋白转移和组蛋白 - 酮解离之间的动力学竞争,定量合理化了我们的观察结果并统一了与其他聚合酶获得的结果。影响这些过程相对大小的因素为转录过程中的核小体命运提供了物理基础,因此为调节基因表达调节。
Upon transcription, histones can either detach from DNA or transfer behind the polymerase through a process believed to involve template looping. The details governing nucleosomal fate during transcription are not well understood. Our atomic force microscopy images of RNA polymerase II-nucleosome complexes confirm the presence of looped transcriptional intermediates and provide mechanistic insight into the histone-transfer process via the distribution of transcribed nucleosome positions. Significantly, we find that a fraction of the transcribed nucleosomes are remodeled to hexasomes, and that this fraction depends on the transcription elongation rate. A simple model involving the kinetic competition between transcription elongation, histone transfer, and histone-histone dissociation quantitatively rationalizes our observations and unifies results obtained with other polymerases. Factors affecting the relative magnitude of these processes provide the physical basis for nucleosomal fate during transcription and, therefore, for the regulation of gene expression.
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