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Updated: Apr 14, 2026

Live Cell Imaging of F-actin Dynamics via Fluorescent Speckle Microscopy FSM
Published on: August 5, 2009
Imaging Fos-Jun transcription factor mobility and interaction in live cells by single plane illumination-fluorescence
Agata Pernuš1, Jörg Langowski1
1Division Biophysics of Macromolecules, DKFZ, Heidelberg, Germany.
Abstract:
We collected mobility and interaction maps of c-Fos-eGFP and c-Jun-mRFP1 transcription factors within living cell nuclei. c-Fos dimerizes with c-Jun to form the transcription activator protein-1 (AP-1) which binds to the specific recognition site. To monitor this process, we used fluorescence cross-correlation spectroscopy on a single plane illumination microscope (SPIM-FCCS), which provides diffusion coefficient and protein-protein interaction data in the whole image plane simultaneously, instead of just one point on conventional confocal FCS. We find a strong correlation between diffusional mobility and interaction: regions of strong interaction show slow mobility. Controls containing either an eGFP-mRFP dimer, separately expressing eGFP and mRPF, or c-Fos-eGFP and c-Jun-mRFP1 mutants lacking dimerization and DNA-binding domains, showed no such correlation. These results extend our earlier findings from confocal FCCS to include spatial information.
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