The Helix-Loop-Helix motif of human EIF3A regulates translation of proliferative cellular mRNAs.

The Helix-Loop-Helix motif of human EIF3A regulates translation of proliferative cellular mRNAs.
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人EIF3A的螺旋环螺旋序列调节增殖性细胞mRNA的翻译。

DOI:
10.1371/journal.pone.0292080
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发表时间:
2023
期刊:
影响因子:
3.7
通讯作者:
--
中科院分区:
综合性期刊3区
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翻译起始是细胞中蛋白质合成的重要检查点,其调节不当与许多癌症有关。真核生物翻译起始因子3(eIF 3)蛋白亚基的过表达与参与细胞增殖的mRNA翻译增加有关。除了通过充当翻译起始复合物组装的支架在一般翻译起始中发挥主要作用外,eIF 3还调节特定细胞mRNA和病毒RNA的翻译。EIF 3A亚基的N-末端螺旋环受阻(HLH)RNA结合基序突变干扰丙型肝炎病毒内部核糖体进入位点(IRES)介导的体外翻译起始。在这里,我们表明,EIF 3A HLH基序控制翻译的一小部分细胞转录本富含致癌基因的mRNA,包括MYC。我们证明EIF 3A的HLH基序特异性作用于MYC mRNA的5′ UTR,并在翻译起始过程中调节EIF 4A 1在选择转录本上的功能。在依赖于MYC过表达的拉莫斯淋巴瘤细胞系中,HLH基序中的突变大大降低MYC表达,阻碍增殖并使细胞对抗癌化合物敏感。这些结果揭示了eIF 3中的EIF 3A HLH基序作为有希望的化疗靶点的潜力。
Improper regulation of translation initiation, a vital checkpoint of protein synthesis in the cell, has been linked to a number of cancers. Overexpression of protein subunits of eukaryotic translation initiation factor 3 (eIF3) is associated with increased translation of mRNAs involved in cell proliferation. In addition to playing a major role in general translation initiation by serving as a scaffold for the assembly of translation initiation complexes, eIF3 regulates translation of specific cellular mRNAs and viral RNAs. Mutations in the N-terminal Helix-Loop-Helix (HLH) RNA-binding motif of the EIF3A subunit interfere with Hepatitis C Virus Internal Ribosome Entry Site (IRES) mediated translation initiation in vitro. Here we show that the EIF3A HLH motif controls translation of a small set of cellular transcripts enriched in oncogenic mRNAs, including MYC. We demonstrate that the HLH motif of EIF3A acts specifically on the 5′ UTR of MYC mRNA and modulates the function of EIF4A1 on select transcripts during translation initiation. In Ramos lymphoma cell lines, which are dependent on MYC overexpression, mutations in the HLH motif greatly reduce MYC expression, impede proliferation and sensitize cells to anti-cancer compounds. These results reveal the potential of the EIF3A HLH motif in eIF3 as a promising chemotherapeutic target.
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