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Mechanism of Transcription Termination by RNA Polymerase III Utilizes a Non-template Strand Sequence-Specific Signal Element

机译:RNA聚合酶III转录终止的机制利用非模板链特定序列信号元素。

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Understanding the mechanism of transcription termination by a eukaryotic RNA polymerase (RNAP) has been limited by lack of a characterizable intermediate that reflects transition from an elongation complex to a true termination event. While other multisubunit RNAPs require multipartite cis-signals and/or ancillary factors to mediate pausing and release of the nascent transcript from the clutches of these enzymes, RNAP III does so with precision and efficiency on a simple oligo(dT) tract, independent of other cis-elements or trans-factors. We report an RNAP III pre-termination complex that reveals termination mechanisms controlled by sequence-specific elements in the non-template strand. Furthermore, the TFIIF-like RNAP III subunit C37 is required for this function of the non-template strand signal. The results reveal the RNAP III terminator as an information-rich control element. While the template strand promotes destabilization via a weak oligo(rU:dA) hybrid, the non-template strand provides distinct sequence-specific destabilizing information through interactions with the C37 subunit.
机译:由于缺乏可反映从延伸复合物到真实终止事件的转变的可表征中间体,因此限制了对真核RNA聚合酶(RNAP)转录终止机制的了解。尽管其他多亚基RNAP需要多部分顺式信号和/或辅助因子来介导这些酶的初生转录物的暂停和释放,但RNAP III可以在简单的寡核苷酸(dT)上以精确而高效的方式进行分离,而与其他酶无关顺式或反式因子。我们报告了RNAP III预终止复合物,揭示了由非模板链中的序列特异性元件控制的终止机制。此外,非模板链信号的这种功能需要TFIIF样RNAP III亚基C37。结果表明,RNAP III终止子是信息丰富的控制元件。虽然模板链通过弱寡核苷酸(rU:dA)杂合促进去稳定化,但非模板链通过与C37亚基的相互作用提供了独特的序列特异性去稳定化信息。

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