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Dual role of the chromatin-binding factor PHF13 in the pre- and post-integration phases of HIV-1 replication

机译:染色质结合因子PHF13在HIV-1复制整合前和整合后阶段的双重作用

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Viruses interact with multiple host cell factors. Some of these are required to promote viral propagation, others have roles in inhibiting infection. Here, we delineate the function of the cellular factor PHF13 (or SPOC1), a putative HIV-1 restriction factor. Early in the HIV-1 replication cycle PHF13 increased the number of integrated proviral copies and the number of infected cells. However, after HIV-1 integration, high levels of PHF13 suppressed viral gene expression. The antiviral activity of PHF13 is counteracted by the viral accessory protein Vpr, which mediates PHF13 degradation. Altogether, the transcriptional master regulator and chromatin binding protein PHF13 does not have purely repressive effects on HIV-1 replication, but also promotes viral integration. By the functional characterization of the dual role of PHF13 during the HIV-1 replication cycle, we reveal a surprising and intricate mechanism through which HIV-1 might regulate the switch from integration to viral gene expression. Furthermore, we identify PHF13 as a cellular target specifically degraded by HIV-1 Vpr.
机译:病毒与多种宿主细胞因子相互作用。其中一些是促进病毒繁殖所必需的,其他一些则具有抑制感染的作用。在这里,我们描述了细胞因子PHF13(或SPOC1)的功能,该细胞因子是HIV-1限制因子。在HIV-1复制周期的早期,PHF13增加了整合的原病毒拷贝的数量和受感染细胞的数量。但是,HIV-1整合后,高水平的PHF13抑制了病毒基因的表达。 PHF13的抗病毒活性被介导PHF13降解的病毒辅助蛋白Vpr抵消。总而言之,转录主调节剂和染色质结合蛋白PHF13对HIV-1复制没有纯粹的抑制作用,但也会促进病毒整合。通过PHF13在HIV-1复制周期中的双重作用的功能表征,我们揭示了令人惊讶且复杂的机制,HIV-1可以通过这种机制调节从整合到病毒基因表达的转换。此外,我们确定PHF13为HIV-1 Vpr特异降解的细胞靶标。

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