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Nucleosome positioning in a model of active chromatin remodeling enzymes

机译:活性染色质重塑酶模型中的核小体定位

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Accounting for enzyme-mediated active sliding, disassembly, and sequence-dependent positioning of nucleosomes, we simulate nucleosome occupancy over cell-cycle-scale times using a stochastic kinetic model. We show that ATP-dependent active nucleosome sliding and nucleosome removal processes are essential to obtain in vivo-like nucleosome positioning. While active sliding leads to dense nucleosome filling, sliding events alone cannot ensure sequence-dependent nucleosome positioning: Active nucleosome removal is the crucial remodeling event that drives positioning. We also show that remodeling activity changes nucleosome dynamics from glassy to liquid-like, and that remodeling dramatically influences exposure dynamics of promoter regions.
机译:考虑到酶介导的核小体的主动滑动,拆卸和序列依赖性定位,我们使用随机动力学模型模拟了细胞周期范围内核小体的占用。我们表明,ATP依赖活性核小体滑动和核小体去除过程对于获得体内样核小体定位至关重要。尽管主动滑动导致密集的核小体填充,但仅滑动事件并不能确保序列依赖性核小体定位:主动核小体去除是驱动定位的关键重塑事件。我们还显示,重塑活性将核小体动力学从玻璃状变为液体样,并且重塑显着影响启动子区域的暴露动力学。

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