A Protein That Switches Folds. Why Should We Care?
Because our best prediction tools were trained to give one answer.
By The Editors/November 8, 2026/1 min read
Metamorphic proteins make up a small, odd corner of the protein universe, and that may be exactly why they matter. Structure predictors learned mostly from static crystal and cryo-EM models, so they tend to return a single confident shape.
For a protein with two native states, one confident shape is half the truth. If fold-switching is more common than the databases suggest, some of our confident answers are incomplete in a way the confidence score cannot tell us. Researchers have coaxed both of KaiB's states out of AlphaFold2 by clustering its input sequences, but that takes deliberate effort.
Sources
- Wayment-Steele HK et al. Predicting multiple conformations via sequence clustering and AlphaFold2. Nature, 2024.
