Post-translational epigenetics: PRMT7 regulates RNA-binding capacity and protein stability to control Leishmania parasite virulence

Post-translational epigenetics: PRMT7 regulates RNA-binding capacity and protein stability to control Leishmania parasite virulence
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翻译后表观遗传学:PRMT7 调节 RNA 结合能力和蛋白质稳定性以控制利什曼原虫寄生虫毒力

DOI:
10.1101/736736
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发表时间:
2019
期刊:
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影响因子:
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通讯作者:
Ferreira T
Ferreira T
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作者:
Ferreira T

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RNA结合蛋白(RBP)是动质体中的主要基因调控因子,因为转录调控几乎不存在,使得Leishmaniaan成为研究非组蛋白底物甲基化的特殊模型。精氨酸甲基化是由蛋白质精氨酸甲基转移酶(PRMT)催化的进化上保守的蛋白质修饰。染色质修饰剂PRMT 7是在高等真核生物和有限数量的单细胞真核生物中发现的唯一III型PRMT。在硕大利什曼原虫中,PRMT 7是一种胞质蛋白,与未知底物的发病机制有关。首次在原生动物中使用比较甲基-SILAC蛋白质组学,我们确定了40个推定的靶标,包括PRMT 7敲除后低甲基化的17个RBP。PRMT 7可以在体外修饰Alba 3和RBP 16反式调节子(分别是哺乳动物RPP 25和YBX 2同源物)作为直接底物。体内PRMT 7水平的缺乏选择性地降低了Alba 3 mRNA与特异性靶转录物的结合能力,并可能影响RBP 16在细胞质中的相对稳定性。RNA免疫沉淀分析表明PRMT 7依赖性甲基化促进Alba 3与选择的靶转录物的结合和δ-amastin表面抗原的稳定性。这些结果突出了PRMT 7介导的精氨酸甲基化在RBP底物上的新作用,表明了控制利什曼原虫基因表达和毒力的调节途径。这项工作介绍了利什曼PRMTs作为mRNA代谢的表观遗传调节因子,并对甲基化对RBP的功能操纵进行了深入研究。
RNA binding proteins (RBPs) are the primary gene regulators in kinetoplastids as transcriptional control is nearly absent, makingLeishmaniaan exceptional model for investigating methylation of non-histone substrates. Arginine methylation is an evolutionarily conserved protein modification catalyzed by Protein aRginine MethylTransferases (PRMTs). The chromatin modifier PRMT7 is the only Type III PRMT found in higher eukaryotes and a restricted number of unicellular eukaryotes. InLeishmania major, PRMT7 is a cytoplasmic protein implicit in pathogenesis with unknown substrates. Using comparative methyl-SILAC proteomics for the first time in protozoa, we identified 40 putative targets, including 17 RBPs hypomethylated upon PRMT7 knockout. PRMT7 can modify Alba3 and RBP16trans-regulators (mammalian RPP25 and YBX2 homologs, respectively) as direct substratesin vitro. The absence of PRMT7 levelsin vivoselectively reduces Alba3 mRNA-binding capacity to specific target transcripts and can impact the relative stability of RBP16 in the cytoplasm. RNA immunoprecipitation analyses demonstrate PRMT7-dependent methylation promotes Alba3 association with select target transcripts and stability ofδ-amastinsurface antigen. These results highlight a novel role for PRMT7-mediated arginine methylation upon RBP substrates, suggesting a regulatory pathway controlling gene expression and virulence inLeishmania. This work introducesLeishmaniaPRMTs as epigenetic regulators of mRNA metabolism with mechanistic insight into the functional manipulation of RBPs by methylation.
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