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A Nonconserved Surface of the TFIIB Zinc Ribbon Domain Plays a Direct Role in RNA Polymerase II Recruitment

机译:TFIIB锌带结构域的非保守表面在RNA聚合酶II招聘中起直接作用

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The general transcription factor TFIIB is a highly conserved and essential component of the eukaryotic RNA polymerase II (pol II) transcription initiation machinery. It consists of a single polypeptide with two conserved structural domains: an amino-terminal zinc ribbon structure (TFIIBZR) and a carboxy-terminal core (TFIIBCORE). We have analyzed the role of the amino-terminal region of human TFIIB in transcription in vivo and in vitro. We identified a small nonconserved surface of the TFIIBZR that is required for pol II transcription in vivo and for different types of basal pol II transcription in vitro. Consistent with a general role in transcription, this TFIIBZR surface is directly involved in the recruitment of pol II to a TATA box-containing promoter. Curiously, although the amino-terminal human TFIIBZR domain can recruit both human pol II and yeast (Saccharomyces cerevisiae) pol II, the yeast TFIIB amino-terminal region recruits yeast pol II but not human pol II. Thus, a critical process in transcription from many different promoters—pol II recruitment—has changed in sequence specificity during eukaryotic evolution.
机译:通用转录因子TFIIB是真核RNA聚合酶II(pol II)转录起始机制的高度保守且必不可少的组成部分。它由具有两个保守结构域的单个多肽组成:一个氨基末端锌带结构(TFIIB ZR )和一个羧基末端核心(TFIIB CORE )。我们已经分析了人TFIIB的氨基末端区域在体内和体外转录中的作用。我们确定了TFIIB ZR 的一个小的非保守表面,这是体内pol II转录和体外不同类型的基础pol II转录所必需的。与转录中的一般作用一致,该TFIIB ZR 表面直接参与pol II向含有TATA盒的启动子的募集。奇怪的是,尽管氨基末端的人TFIIB ZR 域可以募集人pol II和酵母()pol II,但酵母的TFIIB氨基端区域募集了酵母pol II,但不是人类pol II。因此,在真核生物进化过程中,从许多不同启动子转录的关键过程(pol II募集)已经改变了序列特异性。

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