Exploring protein-DNA interactions in 3D using in situ construction, manipulation and visualization of individual DNA dumbbells with optical traps, microfluidics and fluorescence microscopy.

Exploring protein-DNA interactions in 3D using in situ construction, manipulation and visualization of individual DNA dumbbells with optical traps, microfluidics and fluorescence microscopy.
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DOI:
10.1038/nprot.2013.016
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发表时间:
2013-03
期刊:
影响因子:
14.8
通讯作者:
--
中科院分区:
生物学1区
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--
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在本协议中,我们描述了一个程序,以产生“DNA哑铃”-单分子的DNA与微观珠连接在每个末端-和技术,用于操纵个人的DNA哑铃。我们还详细介绍了设计和制造的微流控装置(流动池)与双光捕获操作DNA哑铃和可视化单个蛋白质-DNA复合物的单分子落射荧光显微镜。我们设计的流动池能够使捕获的分子在层流通道和无流动的“过滤器”之间快速移动。该储库提供了在没有外部流动力的情况下检查溶液中DNA-蛋白质复合物的形成的手段,同时仍然保持DNA的预定端到端延伸。这些特征有助于研究蛋白质-DNA相互作用中三维DNA构象和动力学的作用。流动池和试剂的制备各需要两天时间; DNA-哑铃原位组装和单个蛋白质-DNA复合物的成像需要另外一天时间。
In this Protocol, we describe a procedure to generate ‘DNA-dumbbells’ — single molecules of DNA with a microscopic bead attached at each end — and techniques for manipulating individual DNA-dumbbells. We also detail the design and fabrication of a microfluidic device (flow cell) used in conjunction with dual optical trapping to manipulate DNA-dumbbells and to visualize individual protein–DNA complexes by single-molecule epifluorescence microscopy. Our design of the flow cell enables the rapid movement of trapped molecules between laminar flow channels and a flow-free ‘reservoir’. The reservoir provides the means to examine formation of DNA–protein complexes in solution in the absence of external flow forces, while still maintaining a predetermined end-to-end extension of the DNA. These features facilitate examination of the role of three-dimensional DNA conformation and dynamics in protein–DNA interactions. Preparation of flow cells and reagents requires two days each; in situ DNA-dumbbell assembly and imaging of single protein–DNA complexes requires another day.
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