Design and Characterization of pH-Responsive DGEA-Derived Peptide Scaffolds: A Comprehensive Molecular Dynamics
Aditya Swaroop Chaudhary1, Chandrima Modak1, Bhavinkumar Gayakvad2
1Department of Bioengineering and Biotechnology, Birla Institute of Technology Mesra, Ranchi-835215, Jharkhand, India.
ACS Applied Bio Materials
|February 17, 2025
Summary
Researchers developed novel peptide scaffolds using collagen-derived motifs for biomedical use. Modified self-assembling peptides (SAPs) showed enhanced stability and function, offering promising stimuli-responsive biomaterials.
Area of Science:
- Biomaterials Science
- Peptide Engineering
- Molecular Biophysics
Background:
- Stimuli-responsive biomaterials are crucial for advanced biomedical applications.
- Self-assembling peptides (SAPs) conjugated with extracellular matrix (ECM) motifs show promise for bioactive scaffolds.
- Challenges include synthesis complexity, cost, limited functionality, and immunogenicity.
Purpose of the Study:
- To design and evaluate modified collagen-I-derived DGEA motif-based SAPs for stimuli-responsive, functionally active scaffolds.
- To investigate the impact of various modifications on peptide self-assembly and scaffold properties.
- To assess pH and temperature responsiveness for biomedical applications.
Main Methods:
- Extensive molecular dynamics (MD) simulations (16.7 μs) on 20 systematically designed peptide systems.
- Characterization of stimuli-responsive properties, focusing on pH and temperature.
- Evaluation of scaffold formation, stability, aggregation, interpeptide hydrogen bonding, and functional motif accessibility.
Main Results:
- Three peptide systems (DGEA-SBD, DGEA-SBE, DGEA-F4) successfully formed large, stable, bioactive scaffolds.
- Enhanced aggregation (>90%) and interpeptide hydrogen bonding (>30 bonds) were observed.
- DGEA-SBD and DGEA-SBE peptides demonstrated pH-responsive transition to stable, uniform scaffolds at physiological pH, retaining functional motif availability (60-70%).
Conclusions:
- Designed DGEA-based SAPs exhibit increased aggregation and hydrogen bonding while maintaining functional activity.
- Modified peptides offer stimuli-responsive, stable, and bioactive scaffolds suitable for biomedical applications.
- These findings highlight the potential of engineered peptides for advanced tissue engineering and regenerative medicine.
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