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Structural studies of the human PBAF chromatin-remodeling complex

机译:人PBAF染色质重塑复合物的结构研究

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ATP-dependent chromatin remodeling is one of the central processes responsible for imparting fluidity to chromatin and thus regulating DNA transactions. Although knowledge on this process is accumulating rapidly, the basic mechanism (or mechanisms) by which the remodeling complexes alter the structure of a nucleosome is not yet understood. Structural information on these macromolecular machines should aid in interpreting the biochemical and genetic data; to this end, we have determined the structure of the human PBAF ATP-dependent chromatin-remodeling complex preserved in negative stain by electron microscopy and have mapped the nucleosome binding site using two-dimensional (2D) image analysis. PBAF has an overall C-shaped architecture-with a larger density to which two smaller knobs are attached-surrounding a central cavity; one of these knobs appears to be flexible and occupies different positions in each of the structures determined. The 2D analysis of PBAF:nucleosome complexes indicates that the nucleosome binds in the central cavity.
机译:ATP依赖的染色质重塑是负责赋予染色质流动性并由此调节DNA交易的主要过程之一。尽管有关此过程的知识正在迅速积累,但是重塑复合物改变核小体结构的基本机制尚未得到了解。这些大分子机器的结构信息应有助于解释生化和遗传数据;为此,我们通过电子显微镜确定了保留在阴性染色中的人PBAF ATP依赖的染色质重塑复合物的结构,并使用二维(2D)图像分析绘制了核小体结合位点。 PBAF具有整体C形结构-具有较大的密度,两个较小的旋钮连接到其上,围绕中心腔;这些旋钮中的一个似乎是柔性的,并且在所确定的每个结构中占据不同的位置。 PBAF:核小体复合物的二维分析表明,核小体在中央腔中结合。

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