Forks, pincers, and triggers: the tools for nucleotide incorporation and translocation in multi-subunit RNA polymerases.

Forks, pincers, and triggers: the tools for nucleotide incorporation and translocation in multi-subunit RNA polymerases.
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DOI:
10.1016/j.sbi.2009.10.008
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发表时间:
2009-12
影响因子:
6.8
通讯作者:
Kennedy, Scott R.
Kennedy, Scott R.
中科院分区:
生物学2区
文献类型:
--
作者:
Erie, Dorothy A.;Kennedy, Scott R.

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RNA 聚合酶 (RNAP) 的核心作用是催化不断生长的 RNA 转录物的持续合成。最近的结构和生物物理数据使人们对核苷酸添加循环有了更深入的了解,并深入了解控制转录延伸的结构-功能关系。在这篇综述中,我们讨论了晶体结构背景下核苷酸掺入的动力学数据,这些数据显示了多种构象的 RNAP。我们提出了一种核苷酸掺入的促进布朗棘轮模型,其中模板化的 NTP 与主通道中的非催化位点结合促进了构象变化,从而导致催化位点的打开和易位。
The central role of RNA polymerase (RNAP) is to catalyze the processive synthesis of a growing RNA transcript. Recent structural and biophysical data have lead to a deeper understanding of the nucleotide addition cycle and insight into the structure-function relationships that govern transcription elongation. In this review, we discuss kinetic data on nucleotide incorporation in the context of crystal structures, which show RNAP in multiple conformations. We present a facilitated Brownian ratchet model of nucleotide incorporation, in which templated NTP binding to a non-catalytic site in the main channel promotes the conformational changes that lead to opening of the catalytic site and translocation.
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