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Regulation of HIV-1 Gag-Pol Expression by Shiftless, an Inhibitor of Programmed -1 Ribosomal Frameshifting
Cell ( IF 45.5 ) Pub Date : 2019-01-24 , DOI: 10.1016/j.cell.2018.12.030
Xinlu Wang 1 , Yifang Xuan 1 , Yuling Han 2 , Xiang Ding 3 , Kai Ye 1 , Fuquan Yang 3 , Pu Gao 1 , Stephen P Goff 4 , Guangxia Gao 2
Affiliation  

Programmed -1 ribosomal frameshifting (-1PRF) is a widely used translation recoding mechanism. HIV-1 expresses Gag-Pol protein from the Gag-coding mRNA through -1PRF, and the ratio of Gag to Gag-Pol is strictly maintained for efficient viral replication. Here, we report that the interferon-stimulated gene product C19orf66 (herein named Shiftless) is a host factor that inhibits the -1PRF of HIV-1. Shiftless (SFL) also inhibited the -1PRF of a variety of mRNAs from both viruses and cellular genes. SFL interacted with the -1PRF signal of target mRNA and translating ribosomes and caused premature translation termination at the frameshifting site. Downregulation of translation release factor eRF3 or eRF1 reduced SFL-mediated premature translation termination. We propose that SFL binding to target mRNA and the translating ribosome interferes with the frameshifting process. These findings identify SFL as a broad-spectrum inhibitor of -1PRF and help to further elucidate the mechanisms of -1PRF.

中文翻译:

Shiftless 对 HIV-1 Gag-Pol 表达的调节,一种程序化的 -1 核糖体移码抑制剂

程序化 -1 核糖体移码 (-1PRF) 是一种广泛使用的翻译重新编码机制。HIV-1 通过 -1PRF 从 Gag 编码 mRNA 表达 Gag-Pol 蛋白,并且严格保持 Gag 与 Gag-Pol 的比例以有效复制病毒。在这里,我们报告干扰素刺激的基因产物 C19orf66(此处命名为 Shiftless)是一种宿主因子,可抑制 HIV-1 的 -1PRF。Shiftless (SFL) 还抑制来自病毒和细胞基因的各种 mRNA 的 -1PRF。SFL 与目标 mRNA 和翻译核糖体的 -1PRF 信号相互作用,并在移码位点导致翻译过早终止。翻译释放因子 eRF3 或 eRF1 的下调减少了 SFL 介导的过早翻译终止。我们建议 SFL 与目标 mRNA 和翻译核糖体的结合会干扰移码过程。这些发现将 SFL 鉴定为 -1PRF 的广谱抑制剂,有助于进一步阐明 -1PRF 的机制。
更新日期:2019-01-25
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