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RNA processing in human mitochondria.

机译:人类线粒体中的RNA处理。

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摘要

Mammalian mitochondrial DNA is transcribed as precursor polycistronic transcripts containing 13 mRNAs, 2 rRNAs, punctuated by 22 tRNAs. The mechanisms involved in the excision of mitochondrial tRNAs from these polycistronic transcripts have remained largely unknown. We have investigated the roles of ELAC2, mitochondrial RNase P proteins 1 and 3, and pentatricopeptide repeat domain protein 1 in the processing of mitochondrial polycistronic transcripts. We used a deep sequencing approach to characterize the 5' and 3' ends of processed mitochondrial transcripts and provide a detailed map of mitochondrial tRNA processing sites affected by these proteins. We show that MRPP1 and MRPP3 process the 5' ends of tRNAs and the 5' unconventional, non tRNA containing site of the CO1 transcript. By contrast, we find that ELAC2 and PTCD1 affect the 3' end processing of tRNAs. Finally, we found that MRPP1 is essential for transcript processing, RNA modification, translation and mitochondrial respiration.
机译:哺乳动物线粒体DNA被转录为前体多顺反子转录本,其中包含13个mRNA,2个rRNA,被22个tRNA插入。从这些多顺反子转录物中切除线粒体tRNA涉及的机制仍然很大程度上未知。我们已经研究了ELAC2,线粒体RNase P蛋白1和3和五肽重复序列域蛋白1在线粒体多顺反子转录物加工中的作用。我们使用了一种深度测序方法来表征加工后的线粒体转录本的5'和3'末端,并提供了受这些蛋白质影响的线粒体tRNA加工位点的详细图谱。我们显示,MRPP1和MRPP3处理tRNA的5'末端和5'非常规的,非tRNA的CO1转录位点。相比之下,我们发现ELAC2和PTCD1影响tRNA的3'末端加工。最后,我们发现MRPP1对于转录物加工,RNA修饰,翻译和线粒体呼吸至关重要。

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