NMD: a multifaceted response to premature translational termination.

NMD: a multifaceted response to premature translational termination.
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DOI:
10.1038/nrm3454
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发表时间:
2012-11
期刊:
Nature reviews. Molecular cell biology
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尽管大多数来自蛋白质编码基因的mRNA分子注定会被翻译成功能性多肽,但一些mRNA分子会被细胞质量控制途径消除,这些途径共同执行mRNA监视的任务。在无义介导的mRNA衰变(NMD)途径中,过早的翻译终止促进了一系列因子的募集,这些因子会破坏目标mRNA的稳定性。同样的因子似乎也在抑制mRNA的翻译,解离其终止核糖体和mRNP蛋白,促进其截短多肽产物的降解,甚至可能反馈到转录位点以干扰初级转录物的剪接方面发挥关键作用。
Although most mRNA molecules derived from protein-coding genes are destined to be translated into functional polypeptides, some are eliminated by cellular quality control pathways that collectively perform the task of mRNA surveillance. In the nonsense-mediated mRNA decay (NMD) pathway premature translation termination promotes the recruitment of a set of factors that destabilize a targeted mRNA. The same factors also appear to play key roles in repressing the translation of the mRNA, dissociating its terminating ribosome and mRNP proteins, promoting the degradation of its truncated polypeptide product, and possibly even feeding back to the site of transcription to interfere with splicing of the primary transcript.
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