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一只核糖突破性老鼠对RNA聚合酶II进行了鱼雷攻击

Weifei Luo¹, David Bentley

¹Department Biochemistry and Molecular Genetics, University of Colorado Health Sciences Center at Fitzsimons, Aurora, CO 80045, USA.

|December 29, 2004

概括

一个5'到3'外核酶,如酵母老鼠1或人类Xrn2,将RNA聚合酶II (pol II) 终结与新生的转录衰变联系起来. 这种酶与pol II一起传播,帮助在分裂事件后的转录解离.

科学领域:

分子生物学分子生物学
基因表达基因表达
处理RNA处理RNA处理

背景情况:

RNA聚合酶II (pol II) 终结是基因表达的一个关键步骤.
新生的RNA处理和降解受到严格监管.
转录终止和RNA衰变途径之间的相互作用是活跃研究的领域.

研究的目的:

阐明将pol II终止与新生的转录降解联系在一起的机制.
确定5'-3'外核酶在这个过程中的作用.
了解RNA聚合酶延长复合体是如何解离的.

主要方法:

对最近的研究论文进行分析,这些论文将pol II终结和核糖核分解联系起来.
研究5'-3'外核酶 (Rat1和Xrn2) 的功能.
检查转录过程中外核酶与RNA聚合酶的相互作用.

主要成果:

一个5'-3'外核酶与聚合物II一起旅行.
外核酶在多基A或CoTC位点的内核解裂后获得新生RNA的访问权.
外核酶沿着RNA的轨迹,促进了pol II复合物的解离.

结论:

通过5'-3'外核酶进行的核核分解与pol II终结有机学的联系.
这一过程涉及到新生转录的协调裂变和外核分解性降解.
外核酶充当"指导鱼雷",促进转录终止.

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