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Control of Peptide Amphiphile Supramolecular Nanostructures by Isosteric Replacements
Huihua Xing1, Stacey M Chin2, Venkata Reddy Udumula1
1College of Pharmacy, University of Nebraska Medical Center, Omaha, Nebraska 68105, United States.
Biomacromolecules
|July 22, 2021
Summary
Researchers tuned peptide amphiphile (PA) nanostructures using isosteric replacements. This allows pH control over their morphology, creating adaptable biomaterials for various applications.
Area of Science:
- Biomaterials Science
- Supramolecular Chemistry
- Nanotechnology
Background:
- Supramolecular nanostructures offer tunable properties for medicine, pharmacy, and biotechnology.
- Peptide amphiphiles (PAs) are versatile building blocks for self-assembled nanomaterials.
Purpose of the Study:
- To investigate the effect of isosteric replacements on peptide amphiphile self-assembly and nanostructure morphology.
- To demonstrate pH-dependent control over supramolecular nanostructures through isosteric modification.
Main Methods:
- Transmission electron microscopy (TEM)
- Atomic force microscopy (AFM)
- Small-angle X-ray scattering (SAXS)
- Circular dichroism (CD) spectroscopy
- Theoretical modeling
Main Results:
- Isosteric replacements effectively tuned the self-assembly behavior and morphology of peptide amphiphiles.
- Nanostructure morphology was responsive to the ionization states of side chains, influenced by pKa values.
- Isosteric modifications enabled pH control over supramolecular morphology by altering the pKa of surface groups.
- Theoretical studies suggested pH-induced morphological transitions are driven by changes in Coulomb forces.
Conclusions:
- Isosteric replacement is a viable strategy for designing pH-responsive biomaterials.
- This approach allows for the creation of nanostructures that can adapt their behavior based on environmental pH.
- The findings have implications for developing advanced materials for biomedical and biotechnological applications.
