Résumé
Over the last two centuries, the discovery and understanding of the principle of fluorescence have provided new means of characterizing physical/biological/chemical processes in a noninvasive manner. Fluorescence spectroscopy has become one of the most powerful and widely applied methods in the life sciences, from fundamental research to clinical applications. In vitro, fluorescence approaches offer the potential to sense in real-time extra and intracellular molecular interactions and enzymatic reactions, which constitutes a major advantage over other approaches to the study of biomolecular interactions. This technology has been used for the characterization of protein/protein, protein/nucleic acid, protein/substrate, and biomembrane/biomolecule interactions, which play crucial roles in the regulation of cellular pathways. This chapter reviews the different fluorescence strategies that have been developed for sensing molecular interactions in vitro at both steady- and pre-steady-state levels.