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Article Dans Une Revue Methods in Molecular Biology Année : 2014

Quantitative study of protein-protein interactions in live cell by dual-color fluorescence correlation spectroscopy.

Résumé

Dual-color FCS is a powerful method to monitor protein-protein interactions in living cells. The main idea is based on the cross-correlation analysis of temporal fluorescence intensity fluctuations of two fluorescent proteins to obtain their co-diffusion and relative concentration. But, when performing these experiments, the spectral overlap in the emission of the two colors produces an artifact that corrupts the cross-correlation data: spectral bleed-through. We have shown that problems with cross talk are overcome with Fluorescence Lifetime Correlation Spectroscopy (FLCS). FLCS applied to dual-color cross-correlation, utilizing for example eGFP and mCherry fluorescent proteins, allows the determination of protein-protein interactions in living cells without the need of spectral bleed-through calibration. Here, we present in detail how this methodology can be implemented using a commercial setup (Microtime from PicoQuant, SP8 SMD from Leica or any conventional confocal with PicoQuant TCSPC module, and also with a Becker and Hickl TCSPC module). The dual-color FLCS experimental procedure where the different laser intensities do not have to be controlled during the experiment constitutes a very powerful technique to quantitatively study protein interactions in live samples.
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Dates et versions

hal-00951087 , version 1 (24-02-2014)

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Citer

Sergi Padilla-Parra, Nicolas Audugé, Maïté Coppey-Moisan, Marc Tramier. Quantitative study of protein-protein interactions in live cell by dual-color fluorescence correlation spectroscopy.. Methods in Molecular Biology, 2014, 1076, pp.683-98. ⟨10.1007/978-1-62703-649-8_31⟩. ⟨hal-00951087⟩
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