Nanomaterial building blocks based on spider silk-oligonucleotide conjugates

Area of Science:

• Biomaterials Science
• Nanotechnology
• Molecular Biology

Background:

• Self-assembling protein nanofibrils offer a versatile platform for bottom-up fabrication of advanced bionanomaterials.
• Recombinant spider silk proteins, like eADF4(C16), exhibit self-assembly properties suitable for creating ordered nanostructures.
• Site-specific conjugation strategies are crucial for integrating different molecular components into functional nanomaterials.

Purpose of the Study:

• To develop novel spider silk-DNA conjugates using click chemistry for site-specific functionalization.
• To investigate the self-assembly behavior of these hybrid nanostructures.
• To demonstrate the targeted attachment of nanoparticles onto the assembled conjugates.

Main Methods:

• Modification of recombinant eADF4(C16) protein and oligonucleotides for azide-alkyne click coupling.
• Hybridization of oligonucleotide-eADF4(C16) conjugates in linear and branched architectures.
• Characterization of self-assembled structures and nanoparticle attachment via complementary biotin-oligonucleotides.

Main Results:

• Successful synthesis of spider silk-DNA conjugates via site-specific click chemistry.
• Self-assembly of conjugates into β-sheet rich fibrils, primarily directed by the silk component.
• Demonstrated specific and directed attachment of neutravidin-modified gold nanoparticles to the fibril surfaces.

Conclusions:

• Spider silk-DNA conjugates can be effectively fabricated using click chemistry.
• These hybrid materials retain the self-assembly properties of silk while enabling precise nanoparticle functionalization.
• The developed system provides a foundation for creating advanced, functional bionanomaterials for diverse applications.