Bifunctional transfer-messenger RNA.

Bifunctional transfer-messenger RNA.
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DOI:
10.1016/j.biochi.2011.05.029
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发表时间:
2011-11
期刊:
影响因子:
3.9
通讯作者:
Ramadoss, Nitya S.
Ramadoss, Nitya S.
中科院分区:
生物学3区
文献类型:
--
作者:
Keiler, Kenneth C.;Ramadoss, Nitya S.

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转移信使RNA(Transfer-messenger RNA,tmRNA)是一种具有tRNA和mRNA特性的双功能RNA。tmRNA利用这两种功能释放在翻译过程中停滞的核糖体,并靶向新生多肽进行降解。这种协同反应称为反式翻译,有助于翻译质量控制和细菌中基因表达的调节。tmRNA在整个细菌中是保守的,并且是细胞中最丰富的RNA之一,这表明反式翻译对于细菌适应性至关重要。缺乏tmRNA活性的突变体通常具有严重的表型,包括生存力、毒力和对环境胁迫的反应的缺陷。
Transfer-messenger RNA (tmRNA) is a bifunctional RNA that has properties of a tRNA and an mRNA. tmRNA uses these two functions to release ribosomes stalled during translation and target the nascent polypeptides for degradation. This concerted reaction, known as trans-translation, contributes to translational quality control and regulation of gene expression in bacteria. tmRNA is conserved throughout bacteria, and is one of the most abundant RNAs in the cell, suggesting that trans-translation is of fundamental importance for bacterial fitness. Mutants lacking tmRNA activity typically have severe phenotypes, including defects in viability, virulence, and responses to environmental stresses.
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