The pathway of hepatitis C virus mRNA recruitment to the human ribosome.

The pathway of hepatitis C virus mRNA recruitment to the human ribosome.
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DOI:
10.1038/nsmb.1572
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发表时间:
2009-04
影响因子:
16.8
通讯作者:
--
中科院分区:
生物学1区
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--
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真核蛋白质合成始于核糖体解码通道中的mRNA定位,这一过程通常由翻译起始因子控制。一些病毒利用其mRNA中的内部核糖体进入位点(IRES)独立于启动因子来利用核糖体。我们在这里表明,丙型肝炎病毒IRES结合引起的核糖体构象变化对于正确的mRNA定位是必要的,但不是充分的。利用直接羟基自由基探针法监测含有IRES的翻译起始复合体的组装,确定了一个关键步骤,即在启动子tRNA结合的基础上稳定mRNA。然而,令人惊讶的是,这种稳定不依赖于AUG密码子,这突显了影响解码通道配置的启动因子介导的相互作用的重要性。这些结果揭示了IRES RNA如何取代蛋白质合成起始过程中蛋白质因子通常执行的部分功能,但不是全部功能。
Eukaryotic protein synthesis begins with mRNA positioning in the ribosomal decoding channel in a process typically controlled by translation initiation factors. Some viruses utilize an internal ribosome entry site (IRES) in their mRNA to harness ribosomes independently of initiation factors. We show here that a ribosome conformational change induced upon Hepatitis C viral IRES binding is necessary but not sufficient for correct mRNA positioning. Using directed hydroxyl radical probing to monitor the assembly of IRES-containing translation initiation complexes, a critical step has been defined in which mRNA is stabilized upon initiator tRNA binding. Surprisingly, however, this stabilization occurs independent of the AUG codon, underscoring the importance of initiation factor-mediated interactions that influence decoding channel configuration. These results reveal how an IRES RNA supplants some, but not all, of the functions normally carried out by protein factors during protein synthesis initiation.
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