Investigating protein-protein interactions in living cells using fluorescence lifetime imaging microscopy.
Investigating protein-protein interactions in living cells using fluorescence lifetime imaging microscopy.
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使用荧光寿命成像显微镜研究活细胞中的蛋白质 - 蛋白质相互作用。
DOI:
10.1038/nprot.2011.364
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发表时间:
2011-08-11
期刊:
影响因子:
14.8
通讯作者:
中科院分区:
文献类型:
--
作者:
Fluorescence lifetime imaging microscopy (FLIM) is now routinely used for dynamic measurements of signaling events inside living cells, including detection of protein-protein interactions. An understanding of the basic physics of fluorescence lifetime measurements is required to use this technique. In this protocol, we describe both the time-correlated single photon counting and the frequency-domain methods for FLIM data acquisition and analysis. We describe calibration of both FLIM systems, and demonstrate how they are used to measure the quenched donor fluorescence lifetime that results from Förster resonance energy transfer (FRET ). We then show how the FLIM-FRET methods are used to detect the dimerization of the transcription factor CCAAT/enhancer binding protein-α in live mouse pituitary cell nuclei. Notably, the factors required for accurate determination and reproducibility of lifetime measurements are described. With either method, the entire protocol including specimen preparation, imaging and data analysis takes ~2 d.
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