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arXiv 1502.00544q-bio.BM
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活细菌中FoF1-ATP降解酶的三维定位显微镜和跟踪

3D-localization microscopy and tracking of FoF1-ATP synthases in living bacteria

Anja Renz, Marc Renz, Diana Kluetsch, Gabriele Deckers-Hebestreit, Michael Börsch

摘要:

FoF 1-ATP酶是一种膜包埋的蛋白机器,催化三磷酸腺苷的合成。利用基于光活化的定位显微镜(PALM)和结构照明显微镜(SIM),我们探索了活大肠杆菌中单个FoF 1-ATP酶的空间分布和跟踪。大肠杆菌细胞在不同温度下的生理条件。对于通过均方位移测量进行的定量扩散分析,必须考虑膜中具有显著膜曲率的观察区域的有限尺寸。因此,我们采用了“滑动观察窗口”方法(M。Renz等人,Proc. SPIE 8225,2012),并获得了FoF 1-ATP合酶在活E. coli细胞。

英文摘要:

FoF1-ATP synthases are membrane-embedded protein machines that catalyze the synthesis of adenosine triphosphate. Using photoactivation-based localization microscopy (PALM) in TIR-illumination as well as structured illumination microscopy (SIM), we explore the spatial distribution and track single FoF1-ATP synthases in living E. coli cells under physiological conditions at different temperatures. For quantitative diffusion analysis by mean-squared-displacement measurements, the limited size of the observation area in the membrane with its significant membrane curvature has to be considered. Therefore, we applied a 'sliding observation window' approach (M. Renz et al., Proc. SPIE 8225, 2012) and obtained the one-dimensional diffusion coefficient of FoF1-ATP synthase diffusing on the long axis in living E. coli cells.

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