A Pentatricopeptide Repeat Protein in the Plasmodium apicoplast is essential and shows sequence-specific RNA binding

A Pentatricopeptide Repeat Protein in the Plasmodium apicoplast is essential and shows sequence-specific RNA binding
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疟原虫顶质体中的五肽重复蛋白是必需的,并且显示出序列特异性 RNA 结合

DOI:
10.1101/388728
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发表时间:
2018
期刊:
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影响因子:
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通讯作者:
Hicks J
Hicks J
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作者:
Hicks J

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疟疾寄生虫疟原虫和其他顶端复合物(例如弓形虫)由光合生物进化而来,并含有称为顶端质体的必需残留质体。顶端质体基因组的转录是多顺反子的,具有广泛的RNA加工。人们对转录后加工的机制知之甚少。在植物叶绿体中,转录后 RNA 加工由多个五肽重复 (PPR) 蛋白控制。在这里,我们展示了单一顶端质体靶向 PPR 蛋白的生化特征。 Apicoplast PPR1 是必需的,它结合与先前表征的 RNA 加工位点相对应的特定 RNA 序列。我们确定了 PPR1 的特异性结合基序。在 RNAse 保护测定中,PPR1 保护顶端质体转录物免受核糖核酸酶降解。我们的结果表明,顶质体 RNA 加工受到单一蛋白质的控制,因此为开发新的抗疟疾药物提供了一个致命弱点。
The malaria parasitePlasmodiumand other apicomplexans such asToxoplasmaevolved from photosynthetic organisms and contain an essential, remnant plastid termed the apicoplast. Transcription of the apicoplast genome is polycistronic with extensive RNA processing. Little is known about the mechanism of post-transcriptional processing. In plant chloroplasts, post-transcriptional RNA processing is controlled by multiple pentatricopeptide repeat (PPR) proteins. Here, we present the biochemical characterisation of the single apicoplast-targeted PPR protein. Apicoplast PPR1 is essential, and binds specific RNA sequences corresponding with previously characterized RNA processing sites. We identify the specific binding motif of PPR1. In RNAse protection assays, PPR1 shields apicoplast transcripts from ribonuclease degradation. Our results show that apicoplast RNA processing is under the control of a single protein, thus presenting an Achilles’ heel for the development of new anti-malarial drugs.
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