The pentatricopeptide repeat MTSF1 protein stabilizes the nad4 mRNA in Arabidopsis mitochondria.

The pentatricopeptide repeat MTSF1 protein stabilizes the nad4 mRNA in Arabidopsis mitochondria.
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五肽重复MTSF1蛋白在拟南芥线粒体中稳定NAD4 mRNA。

DOI:
10.1093/nar/gkt337
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发表时间:
2013-07
影响因子:
14.9
通讯作者:
Mireau H
Mireau H
中科院分区:
生物学2区
文献类型:
--
作者:
Haïli N;Arnal N;Quadrado M;Amiar S;Tcherkez G;Dahan J;Briozzo P;Colas des Francs-Small C;Vrielynck N;Mireau H

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植物线粒体中的基因表达涉及转录起始和终止的复杂合作,以及随后mRNA加工产生成熟mRNA。在这项研究中,我们描述了拟南芥线粒体稳定因子1 (MTSF1)基因的功能,并表明它编码线粒体nad4 mRNA的3 '加工及其稳定性所必需的五肽重复蛋白。在拟南芥mtsf1突变株中,nad4 mRNA高度不稳定,因此积累了少量的截断呼吸复合物i。生化和遗传分析表明,mtsf1与nad4 mRNA的最后20个核苷酸结合具有高亲和力。我们的数据支持MTSF1功能模型,其中它与nad4 3 '非翻译区的最后核苷酸的关联稳定了nad4 mRNA。此外,MTSF1结合位点的严格保守强烈表明,MTSF1对nad4 mRNA的保护功能在dicot中是保守的。这些结果表明,最初在质体中发现的mRNA稳定过程,即与RNA末端结合的蛋白质构成外核糖核酸酶进展的障碍,发生在植物线粒体中,以保护并伴随定义成熟线粒体mRNA的3 '端。我们的研究还表明,与五肽重复结合位点相对应的短RNA分子也在植物线粒体中积累。
Gene expression in plant mitochondria involves a complex collaboration of transcription initiation and termination, as well as subsequent mRNA processing to produce mature mRNAs. In this study, we describe the function of the Arabidopsis mitochondrial stability factor 1 (MTSF1) gene and show that it encodes a pentatricopeptide repeat protein essential for the 3′-processing of mitochondrial nad4 mRNA and its stability. The nad4 mRNA is highly destabilized in Arabidopsis mtsf1 mutant plants, which consequently accumulates low amounts of a truncated form of respiratory complex I. Biochemical and genetic analyses demonstrated that MTSF1 binds with high affinity to the last 20 nucleotides of nad4 mRNA. Our data support a model for MTSF1 functioning in which its association with the last nucleotides of the nad4 3′ untranslated region stabilizes nad4 mRNA. Additionally, strict conservation of the MTSF1-binding sites strongly suggests that the protective function of MTSF1 on nad4 mRNA is conserved in dicots. These results demonstrate that the mRNA stabilization process initially identified in plastids, whereby proteins bound to RNA extremities constitute barriers to exoribonuclease progression occur in plant mitochondria to protect and concomitantly define the 3′ end of mature mitochondrial mRNAs. Our study also reveals that short RNA molecules corresponding to pentatricopeptide repeat-binding sites accumulate also in plant mitochondria.
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