Label-free measuring and mapping of binding kinetics of membrane proteins in single living cells.

Label-free measuring and mapping of binding kinetics of membrane proteins in single living cells.
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DOI:
10.1038/nchem.1434
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发表时间:
2012-10
期刊:
影响因子:
21.8
通讯作者:
--
中科院分区:
化学1区
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--
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膜蛋白介导细胞对细胞外信号的多种反应。虽然MP作为疾病生物标志物和治疗靶点的价值被深入研究,但MP与其配体的结合动力学的原位研究一直是一个挑战。传统的方法将MP分离出来,然后进行非原位研究,这不能准确地反映它们的天然结构和功能。我们在这里提出了一个无标记的等离子体显微镜方法来映射本地的MP在其原生环境中的结合动力学。这种新的分析方法可以同时进行等离子体和荧光成像,从而使得有可能在一个系统中联合收割机结合基于标记和无标记技术的优势。利用这种方法,我们已经确定了MP在单个细胞表面的分布,以及不同MP的局部结合动力学常数。此外,我们还研究了趋化过程中细胞表面MP的极化。
Membrane proteins (MPs) mediate a variety of cellular responses to extracellular signals. While MPs are intensely studied for their values as disease biomarkers and therapeutic targets, in situ investigation of binding kinetics of MPs with their ligands has been a challenge. Traditional approaches isolate MPs and then study them ex situ, which does not accurately reflect their native structures and functions. We present here a label-free plasmonic microscopy method to map the local binding kinetics of MPs in their native environment. This new analytical method can perform simultaneous plasmonic and fluorescence imaging, thus making it possible to combine the strengths of both label-based and label-free techniques in one system. Using this method, we have determined the distribution of MPs on the surface of single cells, and the local binding kinetic constants of different MPs. Furthermore, we have studied the polarization of the MPs on the cell surface during chemotaxis.
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