...
【24h】

Molecular recognition of the nucleosomal 'supergroove'

机译:核小体“超沟槽”的分子识别

获取原文
获取原文并翻译 | 示例
           

摘要

Chromatin is the physiological substrate in all processes involving eukaryotic DNA. By organizing 147 base pairs of DNA into two tight superhelical coils, the nucleosome generates an architecture where DNA regions that are 80 base pairs apart on linear DNA are brought into close proximity, resulting in the formation of DNA "supergrooves." Here, we report the design of a hairpin polyamide dinner that targets one such supergroove. The 2-Angstrom crystal structure of the nucleosome-polyamide complex shows that the bivalent "clamp" effectively crosslinks the two gyres of the DNA superhelix, improves positioning of the DNA on the histone octamer, and stabilizes the nucleosome against dissociation. Our findings identify nucleosomal supergrooves as platforms for molecular recognition of condensed eukaryotic DNA. In vivo, supergrooves may foster synergistic protein-protein interactions by bringing two regulatory elements into juxtaposition. Because supergroove formation is independent of the translational position of the DNA on the histone octamer, accurate nucleosome positioning over regulatory elements is not required for supergroove participation in eukaryotic gene regulation.
机译:染色质是涉及真核DNA的所有过程的生理底物。通过将147个碱基对的DNA组织成两个紧密的超螺旋线圈,核小体产生了一种结构,其中线性DNA上相距80个碱基对的DNA区域紧密靠近,从而形成了DNA“超沟槽”。在这里,我们报告针对这种超级凹槽的发夹式聚酰胺晚餐的设计。核小体-聚酰胺复合物的2埃晶体结构表明,二价“钳位”有效地交联了DNA超螺旋的两个回转体,改善了DNA在组蛋白八聚体上的定位,并使核小体稳定而不会解离。我们的发现将核小体超级槽鉴定为分子平台识别浓缩的真核DNA。在体内,超级槽可通过将两个调节元件并置来促进蛋白质之间的协同作用。由于超凹槽的形成与组蛋白八聚体上DNA的翻译位置无关,因此超凹槽参与真核基因调控不需要精确的核小体在调控元件上的定位。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号