Fibrillar Self-Assembly of a Chimeric Elastin-Resilin Inspired Engineered Polypeptide

Area of Science:

• Biomaterials Science
• Tissue Engineering
• Protein Engineering

Background:

• Recombinant protein-based biomaterials offer tunable properties for medical devices.
• Chimeric polypeptides combining different protein domains are promising for advanced biomaterials.

Purpose of the Study:

• To prepare and structurally characterize nanofibers from a novel chimeric polypeptide.
• To enhance cell-binding ability by incorporating a fibronectin-derived Arg-Gly-Asp (RGD) sequence.
• To investigate the self-assembly properties and potential cytotoxicity of the engineered polypeptide.

Main Methods:

• Preparation and self-assembly of a chimeric polypeptide containing resilin and elastin domains with an RGD sequence.
• Structural characterization using Scanning Electronic Microscopy (SEM), Atomic Force Microscopy (AFM), and circular dichroism.
• Advanced analysis with synchrotron radiation techniques: X-ray photoelectron spectroscopy (XPS) and near-edge X-ray absorption fine structure spectroscopy (NEXAFS).
• Preliminary cytotoxicity assessment using human fetal foreskin fibroblast (HFFF2) cell cultures.

Main Results:

• Successful self-assembly of the chimeric polypeptide into nanofibers.
• Detailed molecular and supramolecular structural characterization.
• Assessment of hydrogen bond influence on aggregate morphology.
• Preliminary data indicating low cytotoxicity of the polypeptide.

Conclusions:

• The developed chimeric polypeptide self-assembles into nanofibers with potential for biomedical applications.
• Hydrogen bonds play a crucial role in the morphology of self-assembled aggregates.
• The RGD-enhanced polypeptide demonstrates preliminary biocompatibility for tissue engineering.