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:
文献类型:
--
作者:
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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影响因子:
16
作者:
Amitani, Ichiro;Baskin, Ronald J.;Kowalczykowski, Stephen C.
通讯作者:
Kowalczykowski, Stephen C.
影响因子:
3.9
作者:
Granéli, A;Yeykal, CC;Greene, EC
通讯作者:
Greene, EC
影响因子:
14.8
作者:
Lee, Woei Ming;Reece, Peter J.;Dholakia, Kishan
通讯作者:
Dholakia, Kishan
影响因子:
3.3
作者:
Candelli, Andrea;Wuite, Gijs J. L.;Peterman, Erwin J. G.
通讯作者:
Peterman, Erwin J. G.
DOI:
10.1073/pnas.87.1.21
发表时间:
1990-01-01
影响因子:
11.1
作者:
MENETSKI, JP;BEAR, DG;KOWALCZYKOWSKI, SC
通讯作者:
KOWALCZYKOWSKI, SC