The lentiviral integrase binding protein LEDGF/p75 and HIV-1 replication.

The lentiviral integrase binding protein LEDGF/p75 and HIV-1 replication.
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DOI:
10.1371/journal.ppat.1000046
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发表时间:
2008-03-28
期刊:
影响因子:
6.7
通讯作者:
Cherepanov P
Cherepanov P
中科院分区:
医学1区
文献类型:
--
作者:
Engelman A;Cherepanov P

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逆转录病毒复制通过稳定的前病毒DNA中间体进行,并且许多宿主细胞因子已参与其形成。特别是,最近的结果突出了整合酶相互作用透镜上皮衍生生长因子(LEDGF)/p75在慢病毒整合中的重要作用。细胞工程改造过表达LEDGF/p75片段含有其整合酶结合结构域,但缺乏必要的染色质协会的决定因素是难治性的HIV-1感染。此外,在缺乏内源性LEDGF/p75蛋白的细胞中,HIV-1整合水平和所得前病毒的基因组分布均受到显著干扰。对沿沿着转录单位整合的强烈偏好是慢病毒的特征性特征。在缺乏LEDGF/p75的情况下,HIV-1在很大程度上失去了这种偏好,在CpG岛和基因启动子区域附近显示出伴随的整合激增,这些元件天然地被其他类型的逆转录病毒靶向。总之,这些发现强调LEDGF/p75是一个重要的,但不是严格必要的慢病毒DNA整合的辅因子,并巩固了染色质相关的LEDGF/p75作为慢病毒整合前复合物的受体的作用。整合酶-LEDGF/p75界面是目前最具特征的病毒-宿主相互作用之一,它为基因治疗应用中的慢病毒载体靶向以及新型抗逆转录病毒药物的开发提供了一系列机会。
Retroviral replication proceeds through a stable proviral DNA intermediate, and numerous host cell factors have been implicated in its formation. In particular, recent results have highlighted an important role for the integrase-interactor lens epithelium-derived growth factor (LEDGF)/p75 in lentiviral integration. Cells engineered to over-express fragments of LEDGF/p75 containing its integrase-binding domain but lacking determinants essential for chromatin association are refractory to HIV-1 infection. Furthermore, both the levels of HIV-1 integration and the genomic distribution of the resultant proviruses are significantly perturbed in cells devoid of endogenous LEDGF/p75 protein. A strong bias towards integration along transcription units is a characteristic feature of lentiviruses. In the absence of LEDGF/p75, HIV-1 in large part loses that preference, displaying concomitant integration surges in the vicinities of CpG islands and gene promoter regions, elements naturally targeted by other types of retroviruses. Together, these findings highlight that LEDGF/p75 is an important albeit not strictly essential cofactor of lentiviral DNA integration, and solidify a role for chromatin-associated LEDGF/p75 as a receptor for lentiviral preintegration complexes. By now one of the best characterized virus–host interactions, the integrase-LEDGF/p75 interface opens a range of opportunities for lentiviral vector targeting for gene therapy applications as well as for the development of novel classes of antiretroviral drugs.
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发表时间: 2003-01-03
影响因子: 4.8
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