RNA聚合酶II的延长率会影响3' UTRs中的暂停模式
Alexandra Khitun1, Christian Brion2, Zarmik Moqtaderi1
1Departments of Biological Chemistry and Molecular Pharmacology, Harvard Medical School, Boston, Massachusetts, USA.
RNA聚合酶II (Pol II) 延长率影响酵母信使RNA (mRNA) 是多基的. 由于Pol II速度的变化,Pol II暂停模式及其与多化位点的关系发生了变化.
科学领域:
- 分子生物学分子生物学
- 遗传学 遗传学 是一个
- 生物化学 生物化学
背景情况:
- 酵母信使RNAs (mRNAs) 在它们的3'未翻译区域 (3' UTRs) 内的多个位点进行多基化.
- 聚亚脱位 (PAS) 选择与RNA聚合酶II (Pol II) 的延长率密切相关.
- 较慢的Pol II延伸有利于上游PAS,而较快的延伸有利于下游PAS.
研究的目的:
- 为了研究Pol II延长率如何影响Pol II在3' UTRs内的暂停模式.
- 探索Pol II休息点和PAS之间的关系.
- 了解在暂停站点上的序列偏好是如何通过Pol II速度调节的.
主要方法:
- 对野生类型和突变酵母菌株与改变的Pol II延长率的Pol II暂停模式的分析.
- 对围绕着Pol II停顿点的区域进行序列分析.
- 使用随机森林分类器根据基因组特征预测Pol II暂停地点.
主要成果:
- 影响Pol II延长率的突变改变了在3' UTRs内的暂停位置的序列偏好,与编码区域相比,具有明显的偏好.
- 在Pol II速度突变者中,PAS与Pol II停顿点的距离减少.
- 在Pol II的速度衍生中,PAS距离比色素景观更好地预测Pol II的暂停位置.
结论:
- 聚二烯的暂停和聚基化是密切相关的,而聚二烯的延长率起着重要的调节作用.
- Pol II 暂停点和 PAS 之间的空间关系是由 Pol II 速度调节的.
- 染色体景观和转录调节蛋白质有助于Pol II暂停和多基化之间的复杂相互作用.
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