Transcription through the HIV-1 nucleosomes: effects of the PBAF complex in Tat activated transcription.

Transcription through the HIV-1 nucleosomes: effects of the PBAF complex in Tat activated transcription.
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DOI:
10.1016/j.virol.2010.06.009
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发表时间:
2010-09-30
期刊:
影响因子:
3.7
通讯作者:
Kashanchi F
Kashanchi F
中科院分区:
医学3区
文献类型:
--
作者:
Easley R;Carpio L;Dannenberg L;Choi S;Alani D;Van Duyne R;Guendel I;Klase Z;Agbottah E;Kehn-Hall K;Kashanchi F

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SWI/SNF复合物重塑核小体,允许RNA聚合酶II进入HIV-1前病毒DNA。尚未确定哪种SWI/SNF复合物(BAF或PBAF)在转录起始位点重塑核小体。这些复合物仅在三个亚基上不同,并且确定需要哪一个亚基可以解释达特激活转录的调节。我们表明,PBAF是必需的染色质重塑在nuc-1起始位点和转录延伸。我们发现Baf 200是确保LTR水平激活和病毒生产所必需的。有趣的是,在LTR上观察到BAF复合物,而PBAF存在于LTR和Env区域两者上。我们发现,达特激活转录促进组蛋白H2 A和H2 B在LTR的去除,和FACT复合物可能是负责他们的去除。最后,BAF复合物可能在调节HIV-1基因组剪接中发挥重要作用。
The SWI/SNF complex remodels nucleosomes, allowing RNA Polymerase II access to the HIV-1 proviral DNA. It has not been determined which SWI/SNF complex (BAF or PBAF) remodels nucleosomes at the transcription start site. These complexes differ in only three subunits and determining which subunit(s) is required could explain the regulation of Tat activated transcription. We show that PBAF is required for chromatin remodeling at the nuc-1 start site and transcriptional elongation. We find that Baf200 is required to ensure activation at the LTR level and for viral production. Interestingly, the BAF complex was observed on the LTR whereas PBAF was present on both LTR and Env regions. We found that Tat activated transcription facilitates removal of histones H2A and H2B at the LTR, and that the FACT complex may be responsible for their removal. Finally, the BAF complex may play an important role in regulating splicing of the HIV-1 genome.
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