Förster resonance energy transfer (FRET) is essential for studying molecular interactions, yet challenges remain in mapping complex interactions in cellular environments. Here, the authors employ a three-fluorophore FRET-cascade system with time-correlated single photon counting fluorescence lifetime imaging microscopy to elucidate Rap1-interacting adaptor molecule (RIAM)-vinculin interactions in focal adhesions, revealing mechanosensitive roles of vinculin and its interaction with RIAM in a force-independent manner.
- Conor A. Treacy
- Tommy L. Pallett
- Simon M. Ameer‑Beg