Regulation of pol III transcription by nutrient and stress signaling pathways.

Regulation of pol III transcription by nutrient and stress signaling pathways.
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DOI:
10.1016/j.bbagrm.2012.11.001
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发表时间:
2013-03
影响因子:
4.7
通讯作者:
Willis, Ian M.
Willis, Ian M.
中科院分区:
生物学2区
文献类型:
--
作者:
Moir, Robyn D.;Willis, Ian M.

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RNA聚合酶III(pol III)的转录通过产生小结构RNA(如tRNA和5S RNA)占总细胞转录的约15%。这些分子与核糖体蛋白mRNA和rRNA的协同合成将核糖体及其tRNA底物的产生偶联,并平衡蛋白质合成能力与细胞的生长需求。已知核糖体生物发生一般和pol III转录特别是受营养可用性、细胞应激和细胞周期阶段调节,并且在病理状态下受到干扰。高通量蛋白质组学研究已编目修改polIII亚基,装配,起始和辅助因子,但这些修改大多数尚未被链接到功能的后果。在这里,我们回顾了我们目前的理解,在polIII转录装置,调节的目标和已知的信号转导途径来调节其功能的主要调节点。
Transcription by RNA polymerase III (pol III) is responsible for ~15% of total cellular transcription through the generation of small structured RNAs such as tRNA and 5S RNA. The coordinate synthesis of these molecules with ribosomal protein mRNAs and rRNA couples the production of ribosomes and their tRNA substrates and balances protein synthetic capacity with the growth requirements of the cell. Ribosome biogenesis in general and pol III transcription in particular is known to be regulated by nutrient availability, cell stress and cell cycle stage and is perturbed in pathological states. High throughput proteomic studies have catalogued modifications to pol III subunits, assembly, initiation and accessory factors but most of these modifications have yet to be linked to functional consequences. Here we review our current understanding of the major points of regulation in the pol III transcription apparatus, the targets of regulation and the signaling pathways known to regulate their function.
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