Bromodomains regulate dynamic targeting of the PBAF chromatin-remodeling complex to chromatin hubs.

Bromodomains regulate dynamic targeting of the PBAF chromatin-remodeling complex to chromatin hubs.
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溴结构域调节PBAF染色质重塑复合物对染色质枢纽的动态靶向。

DOI:
10.1016/j.bpj.2022.03.027
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发表时间:
2022-05-03
影响因子:
3.4
通讯作者:
Coleman, Robert A.
Coleman, Robert A.
中科院分区:
生物学3区
文献类型:
--
作者:
Kenworthy, Charles A.;Haque, Nayem;Liou, Shu-Hao;Chandris, Panagiotis;Wong, Vincent;Dziuba, Patrycja;Lavis, Luke D.;Liu, Wei-Li;Singer, Robert H.;Coleman, Robert A.

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染色质重塑剂在选择的增强子和启动子处主动靶向乙酰化核小体阵列,以促进或关闭转录爆发期间RNA聚合酶II的重复募集。目前尚不清楚染色质重塑剂如PBAF如何动态靶向活细胞内的不同染色质状态。我们的活细胞单分子荧光显微镜研究揭示了整个细胞核中的染色质枢纽,PBAF在基因组上快速循环。PBAF的布罗莫结构域的缺失损害枢纽中染色质的靶向和稳定接合。双色成像显示PBAF靶向常染色质和异染色质枢纽,其具有模拟染色质稳定性的不同基因组结合动力学特征。PBAF的溴结构域的去除稳定了染色质内的H3.3结合,表明溴结构域可能在核小体的重塑中起直接作用。我们的数据表明,PBAF的动态溴结构域介导的参与核小体可能反映了染色质重塑潜力的差异结合染色质状态。
Chromatin remodelers actively target arrays of acetylated nucleosomes at select enhancers and promoters to facilitate or shut down the repeated recruitment of RNA polymerase II during transcriptional bursting. It is poorly understood how chromatin remodelers such as PBAF dynamically target different chromatin states inside a live cell. Our live-cell single-molecule fluorescence microscopy study reveals chromatin hubs throughout the nucleus where PBAF rapidly cycles on and off the genome. Deletion of PBAF’s bromodomains impairs targeting and stable engagement of chromatin in hubs. Dual color imaging reveals that PBAF targets both euchromatic and heterochromatic hubs with distinct genome-binding kinetic profiles that mimic chromatin stability. Removal of PBAF’s bromodomains stabilizes H3.3 binding within chromatin, indicating that bromodomains may play a direct role in remodeling of the nucleosome. Our data suggests that PBAF’s dynamic bromodomain-mediated engagement of a nucleosome may reflect the chromatin-remodeling potential of differentially bound chromatin states.
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