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Updated: Jun 19, 2026

Microfluidic Mixers for Studying Protein Folding
Published on: April 10, 2012
Signatures of protein fold switching in the unfolded state
1Laboratory of Chemical Physics, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, MD 20892, USA; Department of Biology, Johns Hopkins University, Baltimore, MD 21218, USA.
Researchers analyzed protein folding using cooperativity in unfolded states. They found that fold-switching proteins exhibit distinct cooperative contact networks, suggesting these signatures are present even before folding.
Area of Science:
- Protein biophysics
- Computational biology
- Structural biology
Background:
- Native contacts in unfolded proteins can be identified by mutual cooperativity.
- This cooperativity defines native contact networks.
Purpose of the Study:
- To analyze the unfolded states of fold-switching proteins using the cooperativity approach.
- To investigate if signatures of alternative folds are present in the unfolded state of fold-switching proteins.
Main Methods:
- Simulations of unfolded globular proteins.
- Analysis of native contact networks based on mutual cooperativity.
- Studying designed fold-switching proteins (GA and GB folds) and the natural fold-switcher RfaH.
Main Results:
- A systematic shift in cooperative contact networks was observed between alpha (α) and alpha/beta (α/β) folds in designed fold-switching proteins.
- For the natural fold-switcher RfaH, the energies of contacts for alternative folds were more similar compared to the non-switching protein NusG.
- These findings indicate that the unfolded state contains signatures of cooperativity related to alternative folds.
Conclusions:
- The study successfully applied the cooperativity method to analyze fold-switching proteins.
- The unfolded state of fold-switching proteins encodes information about their alternative structures.
- Cooperativity signatures in the unfolded state can predict or reflect the potential for fold-switching.
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