Assembly of the transcription machinery: ordered and stable, random and dynamic, or both?

Assembly of the transcription machinery: ordered and stable, random and dynamic, or both?
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DOI:
10.1007/s00412-011-0340-y
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发表时间:
2011-12
期刊:
影响因子:
1.6
通讯作者:
McNally JG
McNally JG
中科院分区:
生物学3区
文献类型:
--
作者:
Stasevich TJ;McNally JG

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转录机器的组装是基因激活的关键步骤,但这一过程的基本细节仍不清楚。在这里,我们讨论主要基于生物化学的经典顺序组装模型和主要基于荧光显微镜的新兴动态组装模型之间的明显差异。前一种模型倾向于稳定的转录复合物,其亚基按顺序协作组装,而后一种模型则倾向于不稳定的复合物,其亚基可以更随机地组装。为了面对这种明显的差异,我们回顾了不同实验方法的优点和缺点,并列出了可能导致组装的不同解释的潜在偏差因素。然后我们讨论未来如何通过改进的实验或新技术来克服这些偏见。最后,我们讨论装配动力学模型如何帮助解决有序和稳定装配与随机和动态装配的争论。
The assembly of the transcription machinery is a key step in gene activation, but even basic details of this process remain unclear. Here we discuss the apparent discrepancy between the classic sequential assembly model based mostly on biochemistry and an emerging dynamic assembly model based mostly on fluorescence microscopy. The former model favors a stable transcription complex with subunits that cooperatively assemble in order, whereas the latter model favors an unstable complex with subunits that may assemble more randomly. To confront this apparent discrepancy, we review the merits and drawbacks of the different experimental approaches and list potential biasing factors that could be responsible for the different interpretations of assembly. We then discuss how these biases might be overcome in the future with improved experiments or new techniques. Finally, we discuss how kinetic models for assembly may help resolve the ordered and stable vs. random and dynamic assembly debate.
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