Control of ribosome synthesis in bacteria: the important role of rRNA chain elongation rate

Control of ribosome synthesis in bacteria: the important role of rRNA chain elongation rate
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细菌核糖体合成的控制:rRNA链伸长率的重要作用

DOI:
10.1007/s11427-020-1742-4
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发表时间:
2020-08
期刊:
Science China Life Sciences
影响因子:
--
通讯作者:
Xiongfeng Dai
Xiongfeng Dai
中科院分区:
其他
文献类型:
--
作者:
Manlu Zhu;Haoyan Mu;Mengmei Jia;lingfu Deng;Xiongfeng Dai

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细菌的生长关键依赖于蛋白质的合成,而蛋白质的合成受到核糖体合成的限制。核糖体RNA(RRNA)转录是核糖体合成的限速步骤。一般认为,rRNA操纵子的转录起始率是控制rRNA合成的主要因素。在本研究中,我们建立了一种简便的基于GFP的报告基因方法来测量细菌rRNA链的延长率。我们发现,在营养限制和氯霉素抑制下,大肠杆菌的rRNA链伸长率保持不变。相反,rRNA链的伸长率在低温下急剧下降。引人注目的是,我们发现钠弧菌是已知生长最快的细菌,它的rRNA链延长率比其他细菌高出50%。这有助于其核糖体的快速合成。我们的研究表明,rRNA链的延长率是影响细菌核糖体合成能力的另一个重要因素。
Bacteria growth depends crucially on protein synthesis, which is limited by ribosome synthesis. Ribosomal RNA (rRNA) transcription is the rate-limiting step of ribosome synthesis. It is generally proposed that the transcriptional initiation rate of rRNA operon is the primary factor that controls the rRNA synthesis. In this study, we established a convenient GFP-based reporter approach for measuring the bacterial rRNA chain elongation rate. We showed that the rRNA chain elongation rate ofEscherichia coliremains constant under nutrient limitation and chloramphenicol inhibition. In contrast, rRNA chain elongation rate decreases dramatically under low temperatures. Strikingly, we found thatVibrio natriegens, the fastest growing bacteria known, has a 50% higher rRNA chain elongation rate thanE. coli, which contributes to its rapid ribosome synthesis. Our study demonstrates that rRNA chain elongation rate is another important factor that affects the bacterial ribosome synthesis capacity.
DOI: 10.1093/nar/gkw596
发表时间: 2016-10-14
影响因子: 14.9
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