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Hybrid hydrogels cross-linked by genetically engineered coiled-coil block proteins
C Wang1, J Kopecek, R J Stewart
1Departments of Bioengineering and Pharmaceutics and Pharmaceutical Chemistry, University of Utah, Salt Lake City, Utah 84112, USA.
Biomacromolecules
|November 17, 2001
Summary
Researchers engineered hybrid hydrogels using synthetic polymers and protein cross-links. The hydrogel volume transitions were controlled by protein unfolding, demonstrating tunable stimuli-responsive properties for advanced materials.
Area of Science:
- Biomaterials Science
- Polymer Chemistry
- Protein Engineering
Background:
- Hybrid hydrogels combine synthetic polymers with protein modules for stimuli-responsive behavior.
- Protein conformational changes trigger hydrogel volume transitions.
Purpose of the Study:
- Investigate how coiled-coil protein structure and stability affect hydrogel volume transitions.
- Engineer protein cross-links to tailor hydrogel properties.
Main Methods:
- Synthesized block proteins with interspersed recombinant coiled-coils.
- Characterized proteins using circular dichroism, size exclusion chromatography, gel electrophoresis, and analytical ultracentrifugation.
- Assembled hybrid hydrogels from N-(2-hydroxypropyl)-methacrylamide (HPMA) copolymer and His-tagged block proteins via metal complexation.
Main Results:
- Block proteins formed self-associating oligomers with hierarchic higher-order structures.
- Observed a temperature-induced decrease in hydrogel swelling.
- Correlated the onset temperature of hydrogel volume transition with protein unfolding onset temperature.
Conclusions:
- Stimuli-responsive properties of hybrid hydrogels can be modulated by engineering protein cross-links.
- Protein structure and stability are key factors in controlling hydrogel volume transitions.
- This work provides a pathway for designing tailored protein-crosslinked hydrogels.