Waveguide Boosts Real‑Time Protein Folding Observation
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- Hoi Sung Chung and his team at the National Institute of Diabetes and Digestive and Kidney Diseases developed a modified fluorescence microscopy method that uses a nanophotonic waveguide to boost photon emission, enabling real‑time observation of protein folding.
- Nanophotonic waveguide amplified emitted photons by orders of magnitude, allowing detection of folding transitions lasting only 0.7 to 4 microseconds in dye‑labeled protein samples.
- Physical Review Letters published the study (Chi‑Jui Feng et al., 2026) titled “Cooperative Native Contact Formation Facilitates Free Energy Barrier Crossing in Protein Folding,” reporting that larger proteins appear to fold more easily through coordinated formation of many structural parts.
- Coordinated folding hypothesis suggests that simultaneous formation of multiple native contacts in larger proteins reduces the free‑energy barrier, a behavior the authors propose may have evolved over millions of years.
- Protein samples were prepared in a solution that continuously switched between folded and unfolded states, ensuring the fluorescence signal could be captured throughout rapid folding events.
Why it matters: Biophysicists gain a direct window into protein folding dynamics, enabling studies of folding pathways that were previously too fast to capture, while the coordinated‑folding insight could guide design of more stable therapeutic proteins. The method also offers a scalable platform for high‑throughput screening of folding variants, potentially accelerating drug discovery and reducing costs associated with misfolding‑related diseases.
