Selection of Shine-Dalgarno sequences in plastids.

Selection of Shine-Dalgarno sequences in plastids.
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DOI:
10.1093/nar/gkq978
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发表时间:
2011-03
影响因子:
14.9
通讯作者:
Bock R
Bock R
中科院分区:
生物学2区
文献类型:
--
作者:
Drechsel O;Bock R

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像细菌基因一样,大多数质体(叶绿体)基因排列在操纵子中并转录为多顺反子mRNA。质体蛋白质的生物合成发生在细菌型70 S核糖体上,许多(但不是所有)mRNA的翻译起始由Shine-Dalgarno(SD)序列介导。为了研究SD序列识别的机制,我们分析了含有多个SD序列的mRNA的翻译起始。比较相同的转基因mRNA在大肠杆菌和质体中的翻译效率,我们发现这两个系统之间惊人的差异。最重要的是,虽然内部SD序列在E.在大肠杆菌中,质体表现出主要利用5′端SD序列的倾向。我们建议,内部SD序列的低效率识别提供了存在的理由,大多数质体多顺反子转录进行转录后切割成单顺反子mRNA。
Like bacterial genes, most plastid (chloroplast) genes are arranged in operons and transcribed as polycistronic mRNAs. Plastid protein biosynthesis occurs on bacterial-type 70S ribosomes and translation initiation of many (but not all) mRNAs is mediated by Shine-Dalgarno (SD) sequences. To study the mechanisms of SD sequence recognition, we have analyzed translation initiation from mRNAs containing multiple SD sequences. Comparing translational efficiencies of identical transgenic mRNAs in Escherichia coli and plastids, we find surprising differences between the two systems. Most importantly, while internal SD sequences are efficiently recognized in E. coli, plastids exhibit a bias toward utilizing predominantly the 5′-most SD sequence. We propose that inefficient recognition of internal SD sequences provides the raison d'être for most plastid polycistronic transcripts undergoing post-transcriptional cleavage into monocistronic mRNAs.
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