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

Dual role of the chromatin-binding factor PHF13 in the pre- and post-integration phases of HIV-1 replication.
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DOI:
10.1098/rsob.170115
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发表时间:
2017-10
期刊:
影响因子:
5.8
通讯作者:
Schindler M
Schindler M
中科院分区:
生物学2区
文献类型:
--
作者:
Hofmann S;Dehn S;Businger R;Bolduan S;Schneider M;Debyser Z;Brack-Werner R;Schindler M

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病毒与多种宿主细胞因子相互作用。其中一些是促进病毒传播所必需的,另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,它可能是HIV-1的限制因子。在HIV-1复制周期的早期,PHF13增加了整合前病毒拷贝的数量和感染细胞的数量。然而,在HIV-1整合后,高水平的PHF13抑制了病毒基因的表达。PHF13的抗病毒活性被病毒辅助蛋白VPR所抵消,VPR介导PHF13的降解。总之,转录主调制子和染色质结合蛋白PHF13不仅对HIV-1复制有纯粹的抑制作用,而且还促进病毒整合。通过对PHF13在HIV-1复制周期中的双重作用的功能描述,我们揭示了HIV-1可能调节从整合到病毒基因表达的一个令人惊讶和复杂的机制。此外,我们确定PHF13是HIV-1 VPR特异性降解的细胞靶标。
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.
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