首页> 外文期刊>Journal of Molecular Biology >Ribosome Rescue by tmRNA Requires Truncated mRNAs.
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Ribosome Rescue by tmRNA Requires Truncated mRNAs.

机译:tmRNA拯救核糖体需要截短的mRNA。

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tmRNA targets ribosomes, stalled either on truncated mRNAs or on mRNAs with slowly read sense or stop codons, tags the newly synthesized peptide chains for degradation and allows for their release by a class-1 release factor. We have studied in vitro how the rate of trans-transfer of a peptide from the P-site tRNA to tmRNA and the efficiency by which tmRNA competes with peptide release factors depend on the length of the mRNA downstream from the P-site. We show that the rate and efficiency of tmRNA action decrease rapidly with increasing down stream length and approach zero when it exceeds 15 bases. We demonstrate that tmRNA action is strongly stimulated by RelE cleavage of mRNA in the A site. We conclude that tmRNA action in vivo must always be preceded by mRNA truncation, and suggest that cleavage of ribosome bound mRNAs is a common element in different bacterial stress responses.
机译:tmRNA靶向核糖体,停在截短的mRNA或具有缓慢阅读的有义或终止密码子的mRNA上,标记新合成的肽链进行降解,并允许其通过1类释放因子释放。我们已经在体外研究了肽从P位点tRNA到tmRNA的转移速率以及tmRNA与肽释放因子竞争的效率如何取决于P位点下游mRNA的长度。我们显示,tmRNA作用的速率和效率随着下游长度的增加而迅速降低,并且当其超过15个碱基时接近零。我们证明tmRNA的作用是由A位点中的mRNA的RelE切割强烈刺激的。我们得出结论,体内tmRNA的作用必须始终被mRNA截断,并建议核糖体结合的mRNA的裂解是不同细菌应激反应中的一个常见元素。

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