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Updated: May 31, 2026
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Controlling the Size, Shape and Stability of Supramolecular Polymers in Water
Published on: August 2, 2012
Design Principles for β-Solenoid Stability via Covalent and Electrostatic Capping Motifs
R J Eufemio1, G Renzer2, J Lehmann2
1Department of Chemistry and Biochemistry, Boise State University, Boise, Idaho 83725, United States.
The Journal of Physical Chemistry Letters
|May 29, 2026
Summary
Researchers discovered that protein termini capping, using covalent or electrostatic methods, controls the stability and environmental response of extended beta-solenoid proteins, crucial for biomaterial design.
Area of Science:
- Biochemistry
- Materials Science
- Structural Biology
Background:
- Extended beta-solenoid proteins offer promising scaffolds for biomaterials due to their repetitive structures.
- However, their inherent terminal fraying limits stability and general stabilization strategies are lacking.
Purpose of the Study:
- To identify and characterize mechanisms controlling beta-solenoid protein stability and environmental responsiveness.
- To explore the role of terminal capping motifs in protein fold integrity.
Main Methods:
- Utilized fungal and bacterial ice-nucleating proteins as model beta-solenoid systems.
- Investigated the impact of disulfide-mediated (fungal) and electrostatic (bacterial) capping on protein stability under various environmental conditions (pH, temperature, reductants).
Main Results:
- Disulfide caps in fungal proteins maintain fold integrity under thermal and pH stress but are sensitive to reductants, decreasing activity by over 90%.
- Electrostatic caps in bacterial proteins are robust to reducing agents but more sensitive to pH and temperature fluctuations.
- Identified terminal capping chemistry as a critical factor influencing beta-solenoid stability and robustness.
Conclusions:
- Terminal capping motifs provide orthogonal mechanisms to modulate beta-solenoid stability and environmental response.
- This finding offers a promising strategy for designing robust repeat-protein scaffolds for functional biomaterials.
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