Gene target specificity of the Super Elongation Complex (SEC) family: how HIV-1 Tat employs selected SEC members to activate viral transcription.

Gene target specificity of the Super Elongation Complex (SEC) family: how HIV-1 Tat employs selected SEC members to activate viral transcription.
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超级延伸复合物 (SEC) 家族的基因靶标特异性:HIV-1 Tat 如何利用选定的 SEC 成员来激活病毒转录

DOI:
10.1093/nar/gkv541
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发表时间:
2015-07-13
影响因子:
14.9
通讯作者:
Zhou Q
Zhou Q
中科院分区:
生物学2区
文献类型:
--
作者:
Lu H;Li Z;Zhang W;Schulze-Gahmen U;Xue Y;Zhou Q

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AF4/FMR2蛋白AFF1和AFF4作为支架组装超级延长复合体(SEC),强烈激活HIV-1和细胞基因的转录延长。尽管它们可以二聚化,但目前尚不清楚这些二聚体是否存在并在体内的SEC内发挥作用。此外,目前还不清楚AFF1和AFF4在调节不同基因的SEC依赖激活方面是否具有相似的功能。提供这些问题的答案,我们目前的研究表明,AFF1和AFF4位于不同的Secs中,显示出很大程度上不同的基因靶标特异性。虽然AFF1-SEC在支持病毒Tat蛋白反式激活HIV-1方面更有效,但AFF4-SEC在热休克时诱导HSP70方面更重要。AFF1和AFF4在TAT反式激活方面的功能差异被追溯到两种蛋白质之间的单一氨基酸变异,这导致它们以不同的效率增强TAT对SEC关键成分P-TEFb的亲和力。最后,全基因组分析证实,AFF1-SEC和AFF4-SEC调控的基因在很大程度上是不重叠的,并且发挥着不同的功能。因此,SEC代表了一系列相关的复合体,在不同的细胞和病毒基因反式激活期间,这些复合体的存在增加了调节多样性和基因控制选项。
The AF4/FMR2 proteins AFF1 and AFF4 act as a scaffold to assemble the Super Elongation Complex (SEC) that strongly activates transcriptional elongation of HIV-1 and cellular genes. Although they can dimerize, it is unclear whether the dimers exist and function within a SEC in vivo. Furthermore, it is unknown whether AFF1 and AFF4 function similarly in mediating SEC-dependent activation of diverse genes. Providing answers to these questions, our current study shows that AFF1 and AFF4 reside in separate SECs that display largely distinct gene target specificities. While the AFF1-SEC is more potent in supporting HIV-1 transactivation by the viral Tat protein, the AFF4-SEC is more important for HSP70 induction upon heat shock. The functional difference between AFF1 and AFF4 in Tat-transactivation has been traced to a single amino acid variation between the two proteins, which causes them to enhance the affinity of Tat for P-TEFb, a key SEC component, with different efficiency. Finally, genome-wide analysis confirms that the genes regulated by AFF1-SEC and AFF4-SEC are largely non-overlapping and perform distinct functions. Thus, the SEC represents a family of related complexes that exist to increase the regulatory diversity and gene control options during transactivation of diverse cellular and viral genes.
DOI: 10.1016/j.molcel.2010.04.013
发表时间: 2010-05-14
期刊: Molecular cell
影响因子: 16
作者:
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控制 HIV-1 转录延伸的病毒-宿主相互作用。
DOI: 10.1021/cr400120z
发表时间: 2013-11-13
期刊: CHEMICAL REVIEWS
影响因子: 62.1
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DOI: 10.7554/elife.02375
发表时间: 2014-04-24
期刊: eLife
影响因子: 7.7
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AFF1 是一种普遍存在的 P-TEFb 伙伴,能够从 7SK snRNP 中提取出 P-TEFb,并形成用于 HIV 反式激活的 SEC
DOI: 10.1073/pnas.1318503111
发表时间: 2014-01-07
影响因子: 11.1
作者:
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DOI: 10.1016/j.molcel.2010.01.026
发表时间: 2010-02-12
期刊: MOLECULAR CELL
影响因子: 16
作者:
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通讯作者: Shilatifard, Ali