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Iron homeostasis regulates the activity of the microRNA pathway through poly(C)-binding protein 2

机译:铁稳态通过poly(C)结合蛋白2调节microRNA途径的活性

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MicroRNAs (miRNAs) control gene expression by promoting degradation or repressing translation of target mRNAs. The components of the miRNA pathway are subject to diverse modifications that can modulate the abundance and function of miRNAs. Iron is essential for fundamental metabolic processes, and its homeostasis is tightly regulated. Here we identified iron chelators as a class of activator of the miRNA pathway that could promote the processing of miRNA precursors. We show that cytosolic iron could regulate the activity of the miRNA pathway through poly(C)-binding protein 2 (PCBP2). PCBP2 is associated with Dicer and promotes the processing of miRNA precursors. Cytosolic iron could modulate the association between PCBP2 and Dicer, as well as the multimerization of PCBP2 and its ability to bind to miRNA precursors, which can alter the processing of miRNA precursors. Our findings reveal a role of iron homeostasis in the regulation of miRNA biogenesis.
机译:MicroRNA(miRNA)通过促进降解或抑制靶mRNA的翻译来控制基因表达。 miRNA途径的组成部分经过各种修饰,可以调节miRNA的丰度和功能。铁对于基本的代谢过程必不可少,其稳态也受到严格的调节。在这里,我们将铁螯合剂鉴定为可以促进miRNA前体加工的miRNA途径激活剂。我们表明,胞质铁可以通过聚(C)结合蛋白2(PCBP2)调节miRNA途径的活性。 PCBP2与Dicer相关联,并促进miRNA前体的加工。胞质铁可以调节PCBP2和Dicer之间的结合,以及PCBP2的多聚化及其与miRNA前体结合的能力,从而改变miRNA前体的加工过程。我们的发现揭示了铁稳态在调节miRNA生物发生中的作用。

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