Bioinspired and Mechanically Strong Fibers Based on Engineered Non-Spider Chimeric Proteins

Area of Science:

• Materials Science
• Biotechnology
• Protein Engineering

Background:

• Fibrous proteins, particularly recombinant spidroins, are of interest for lightweight, strong materials.
• Current recombinant spider silks have moderate mechanical performance, limiting their applications.
• There is a need for alternative structural proteins to create robust, high-performance fibers.

Purpose of the Study:

• To develop a novel class of biological fibers with enhanced mechanical properties.
• To explore the potential of chimeric proteins for creating ultrastrong bioinspired materials.
• To investigate the performance of fibers made from a combination of elastin-like polypeptide and squid ring teeth protein.

Main Methods:

• Designed a chimeric protein combining cationic elastin-like polypeptide and squid ring teeth protein sequences.
• Produced biological fibers from this engineered chimeric protein.
• Characterized the mechanical properties, including breaking strength and toughness, of the resulting fibers.

Main Results:

• The chimeric protein fibers exhibited a breaking strength of up to approximately 630 MPa.
• The fibers achieved a toughness as high as approximately 130 MJ/m³.
• These properties are superior to many recombinant spider silks and comparable to some native protein fibers.

Conclusions:

• A novel strategy using designed chimeric proteins can yield ultrastrong biological fibers.
• This approach offers a promising avenue for developing advanced bioinspired protein materials.
• The developed fibers represent a significant advancement in protein-based material science.