Manipulating protein conformations by single-molecule AFM-FRET nanoscopy.

Manipulating protein conformations by single-molecule AFM-FRET nanoscopy.
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DOI:
10.1021/nn2038669
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发表时间:
2012-02-28
期刊:
影响因子:
17.1
通讯作者:
Lu HP
Lu HP
中科院分区:
材料科学1区
文献类型:
--
作者:
He Y;Lu M;Cao J;Lu HP

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结合原子力显微镜和荧光共振能量转移光谱(AFM-FRET),我们发展了一种单分子AFM-FRET纳米显微镜方法,能够有效地在大样本区域内精确定位和机械操纵目标染料标记的单个蛋白质,同时通过记录单分子FRET时间轨迹来监测目标蛋白质的构象变化。我们进一步展示了这种纳米显微镜在操纵单分子蛋白质构象和同时测量Cy3-Cy5标记的激酶HPPK(6-羟甲基-7,8-二氢蝶呤焦磷酸激酶)的单分子FRET方面的应用。通过分析目标单分子酶的时间分辨FRET轨迹和相关的AFM力拉力曲线,我们能够观察到AFM机械力拉力作用下特定配位蛋白质的构象变化。
Combining atomic force microscopy and fluorescence resonance energy transfer spectroscopy (AFM-FRET), we have developed a single-molecule AFM-FRET nanoscopy approach capable of effectively pinpointing and mechanically manipulating a targeted dye-labeled single protein in a large sampling area, and simultaneously monitoring the conformational changes of the targeted protein by recording single-molecule FRET time trajectories. We have further demonstrated an application of using this nanoscopy on manipulation of single-molecule protein conformation and simultaneous single-molecule FRET measurement of a Cy3–Cy5 labeled kinase enzyme, HPPK (6-hydroxymethyl-7,8-dihydropterin pyrophosphokinase). By analyzing time-resolved FRET trajectories and correlated AFM force pulling curves of the targeted single-molecule enzyme, we are able to observe the protein conformational changes of a specific coordination by AFM mechanic force pulling.
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