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
中科院分区:
文献类型:
--
作者:
Brès V;Yoshida T;Pickle L;Jones KA
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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