SKIP interacts with c-Myc and Menin to promote HIV-1 Tat transactivation.

SKIP interacts with c-Myc and Menin to promote HIV-1 Tat transactivation.
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DOI:
10.1016/j.molcel.2009.08.015
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发表时间:
2009-10-09
期刊:
影响因子:
16
通讯作者:
Jones KA
Jones KA
中科院分区:
生物学1区
文献类型:
--
作者:
Brès V;Yoshida T;Pickle L;Jones KA

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Ski相互作用蛋白SKIP/SNW1与P - TEFb/CDK9延伸因子相关联,并共同激活包括HIV - 1在内的诱导型基因。我们在此表明,SKIP还与c - Myc和Menin(MLL1组蛋白甲基转移酶(H3K4me3)复合物的一个亚基)相关联,并且HIV - 1 Tat反式激活需要c - Myc和Menin,但不需要MLL1或H3K4me3。RNA干扰 - 染色质免疫沉淀(RNAi - ChIP)实验显示,SKIP在Tat:P - TEFb的下游发挥作用,将c - Myc及其伙伴TRRAP(一种组蛋白乙酰转移酶的支架蛋白)招募到HIV - 1启动子上。相比之下,SKIP被RNF20 H2B泛素连接酶招募到基础HIV - 1启动子上,这一步骤可被Tat绕过且被c - Myc下调。有趣的是,我们发现SKIP和P - TEFb对于紫外线应激诱导的HIV - 1转录是可有可无的,用CDK9抑制剂 flavopiridol处理细胞可强烈上调该转录。因此,SKIP与c - Myc和Menin共同作用,在应激条件下被绕过的延伸步骤促进HIV - 1 Tat:P - TEFb转录。
The Ski-interacting protein, SKIP/SNW1, associates with the P-TEFb/CDK9 elongation factor and coactivates inducible genes, including HIV-1. We show here that SKIP also associates with c-Myc and Menin, a subunit of the MLL1 histone methyltransferase (H3K4me3) complex, and that HIV-1 Tat transactivation requires c-Myc and Menin, but not MLL1 or H3K4me3. RNAi-ChIP experiments reveal that SKIP acts downstream of Tat:P-TEFb to recruit c-Myc and its partner TRRAP, a scaffold for histone acetyltransferases, to the HIV-1 promoter. By contrast, SKIP is recruited by the RNF20 H2B ubiquitin ligase to the basal HIV-1 promoter, in a step that is bypassed by Tat and down-regulated by c-Myc. Interestingly, we find that SKIP and P-TEFb are dispensable for UV stress-induced HIV-1 transcription, which is strongly up-regulated by treating cells with the CDK9 inhibitor, flavopiridol. Thus SKIP acts with c-Myc and Menin to promote HIV-1 Tat:P-TEFb transcription at an elongation step that is bypassed under stress.
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