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Folded-state compatibility and unfolded-state constraint govern staple-based stabilization: guidelines from a
Samantha C Hatfield1, Alexa N Mattingley1, Kayla K Sujeta1
1Department of Chemistry and Biochemistry, Brigham Young University Irvine California USA joshprice@byu.edu.
RSC Chemical Biology
|March 16, 2026
Summary
Peptide stapling stabilizes proteins by limiting unfolded states and matching folded structures. New guidelines improve rational design for stabilized peptide therapeutics beyond trial and error.
Area of Science:
- Biochemistry
- Structural Biology
- Medicinal Chemistry
Background:
- Peptide stapling enhances protein stability and therapeutic potential.
- Current design relies heavily on empirical methods due to unclear principles.
Purpose of the Study:
- Establish quantitative guidelines for selecting optimal peptide staple sites.
- Develop a predictive framework for rational stapled peptide design.
Main Methods:
- Utilized the defined geometry of an alpha-helical coiled coil for controlled comparisons.
- Employed experimental measurements and molecular simulations to analyze staple site effects.
Main Results:
- Staples linking residues forming interhelical salt bridges provide greater stabilization.
- N-terminal staples are more stabilizing than C-terminal ones; disulfide bonds can reduce impact.
- Mismatched staple lengths and site spacing can lead to destabilization due to non-native geometry.
Conclusions:
- Peptide stabilization depends on unfolded-state constraint and folded-state compatibility.
- These principles enable principle-guided development of stabilized peptide therapeutics.
- Offers a move beyond empirical screening towards rational design strategies.
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