Related Experiment Videos
Sea Urchin Spicule Matrix Proteins Form Mesoscale "Smart" Hydrogels That Exhibit Selective Ion Interactions
Martin Pendola1, Anastasia Davidyants1, Yong Seob Jung1
1Center for Skeletal Biology and Craniofacial Medicine, Laboratory for Chemical Physics, New York University College of Dentistry, 345 East 24th Street, New York, New York 10010, United States.
ACS Omega
|August 29, 2019
Summary
Two sea urchin spicule proteins, SM30B/C and SM50, form ion-responsive hydrogels. These smart hydrogels control water and solute diffusion, offering a model for advanced biomaterial design.
Area of Science:
- Biomineralization
- Materials Science
- Biochemistry
Background:
- Sea urchin spicule proteome exceeds 200 proteins controlling mineralization.
- Spicules form fracture-resistant composites through protein interactions.
Purpose of the Study:
- Identify hydrogelator proteins within the spicule proteome.
- Investigate the properties and responsiveness of these hydrogelators.
- Establish a model system for designing ion-responsive hydrogels.
Main Methods:
- Recombinant protein expression and purification.
- Hydrogel formation and characterization (size, organization, structure).
- Response to pH and Ca(II) ion concentration.
- Diffusion-ordered spectroscopy (DOSY) NMR to study water and solute diffusion.
Main Results:
- SM30B/C and SM50 proteins identified as hydrogelators.
- Proteins self-assemble into porous mesoscale hydrogel particles.
- Hydrogels exhibit ion-responsive behavior, altering structure with pH and Ca(II).
- Hydrogels influence water diffusion; SM50 also affects anionic solute diffusion.
Conclusions:
- Spicule extracellular matrix contains responsive hydrogelator proteins.
- These proteins control diffusion and respond to environmental cues.
- Serves as a model for developing ion-responsive, composite, and smart hydrogels.