tmRNA is essential in Shigella flexneri.

tmRNA is essential in Shigella flexneri.
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DOI:
10.1371/journal.pone.0057537
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发表时间:
2013
期刊:
影响因子:
3.7
通讯作者:
Keiler KC
Keiler KC
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Ramadoss NS;Zhou X;Keiler KC

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不间断mrna对细菌构成挑战,因为如果没有终止密码子,翻译就不能有效地终止。反翻译途径通过去除不间断的mRNA、不完整的蛋白质和停滞的核糖体来分解不间断的翻译复合体。P1共转导实验表明,tmRNA是反翻译途径的关键组分,对福氏志贺氏菌的生存至关重要。tmRNA先前被证明在密切相关的物种大肠杆菌中是可有可无的,因为大肠杆菌含有一个由替代释放因子ArfA介导的反翻译备份系统。基因组序列分析表明,flexneri没有编码ArfA的基因。大肠杆菌ArfA可以抑制flexneri对tmRNA的需求,表明tmRNA在flexneri中是必需的,因为没有功能备份系统。这些数据表明,大多数细菌需要不间断翻译复合物的分辨率。
Nonstop mRNAs pose a challenge for bacteria, because translation cannot terminate efficiently without a stop codon. The trans-translation pathway resolves nonstop translation complexes by removing the nonstop mRNA, the incomplete protein, and the stalled ribosome. P1 co-transduction experiments demonstrated that tmRNA, a key component of the trans-translation pathway, is essential for viability in Shigella flexneri. tmRNA was previously shown to be dispensable in the closely related species Escherichia coli, because E. coli contains a backup system for trans-translation mediated by the alternative release factor ArfA. Genome sequence analysis showed that S. flexneri does not have a gene encoding ArfA. E. coli ArfA could suppress the requirement for tmRNA in S. flexneri, indicating that tmRNA is essential in S. flexneri because there is no functional backup system. These data suggest that resolution of nonstop translation complexes is required for most bacteria.
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