Fluorescence lifetime imaging microscopy (FLIM) to quantify protein-protein interactions inside cells

Area of Science:

• Cellular and Molecular Biology
• Biophysics
• Biochemistry

Background:

• Proteins function in dynamic complexes within cells, necessitating in vivo study.
• Traditional methods for studying protein interactions were primarily in vitro biochemical assays.
• Previous limitations hindered the study of protein dynamics and interactions within their native cellular environment.

Purpose of the Study:

• To highlight recent advancements in cellular imaging spectroscopy for studying protein dynamics.
• To discuss the application of these techniques for investigating protein-protein interactions in living cells.
• To explain how these methods bridge the gap between in vitro biochemistry and in vivo cellular processes.

Main Methods:

• Minimally invasive cellular imaging spectroscopy.
• Biochemical approaches adapted for in vivo cellular studies.
• Time-correlated single-photon counting (TCSPC) imaging.

Main Results:

• Enables high spatial resolution analysis of protein behaviors within living cells.
• Allows detection and quantification of protein dynamics down to the single-molecule level.
• Facilitates determination of protein interaction rates with high spatial resolution.

Conclusions:

• Cellular imaging spectroscopy revolutionizes the study of protein dynamics and interactions.
• These techniques allow for in vivo biochemical experiments with unprecedented resolution.
• Advances in imaging provide new insights into cellular machinery and protein function.