The Paf1 complex: platform or player in RNA polymerase II transcription?

The Paf1 complex: platform or player in RNA polymerase II transcription?
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DOI:
10.1016/j.bbagrm.2010.01.001
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发表时间:
2010-05
影响因子:
4.7
通讯作者:
Jaehning, Judith A.
Jaehning, Judith A.
中科院分区:
生物学2区
文献类型:
--
作者:
Jaehning, Judith A.

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Paf 1复合物(Paf 1C)由蛋白质Paf 1、Ctr 9、Cdc 73、Rtf 1和Leo 1组成,伴随RNA聚合酶II(pol II)从启动子到mRNA和snoRNA编码基因的3'末端形成位点;它也被发现与rDNA上的RNA聚合酶I(pol I)相关。Paf 1C存在于简单和复杂的真核生物中;在人类细胞中,hSki 8也是复合体的一部分。Paf 1C与大量且不断增长的转录相关过程有关,包括:与转录激活因子的通信;组蛋白修饰因子的募集和激活;促进染色质模板上的延伸;以及募集精确终止转录所需的3'端加工因子。Paf 1C因子的缺失或突变导致基因表达的改变,这可能导致发育程序的失调和细胞分裂的失控,从而导致人类癌症。这篇评论认为,最近的信息,可能有助于解决是否Paf 1C主要是一个“平台”的聚合酶II,协调许多关键的转录因子的协会,或者如果复杂的本身起着更直接的作用,在转录的一个或多个步骤。
The Paf1 complex (Paf1C), composed of the proteins Paf1, Ctr9, Cdc73, Rtf1, and Leo1, accompanies RNA polymerase II (pol II) from the promoter to the 3' end formation site of mRNA and snoRNA encoding genes; it is also found associated with RNA polymerase I (pol I) on rDNA. The Paf1C is found in simple and complex eukaryotes; in human cells hSki8 is also part of the complex. The Paf1C has been linked to a large and growing list of transcription related processes including: communication with transcriptional activators; recruitment and activation of histone modification factors; facilitation of elongation on chromatin templates; and the recruitment of 3' end processing factors necessary for accurate termination of transcription. Absence of, or mutations in, Paf1C factors result in alterations in gene expression that can result in misregulation of developmental programs and loss of control of cell division leading to cancer in humans. This review considers recent information that may help to resolve whether the Paf1C is primarily a “platform” on pol II that coordinates the association of many critical transcription factors, or if the complex itself plays a more direct role in one or more steps in transcription.
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