Molecular engineering of avidin and hydrophobin for functional self-assembling interfaces.

Area of Science:

• Biomolecular engineering
• Nanoscale technology
• Protein engineering

Background:

• Controlling interface functionality is crucial for nanoscale technology and biological applications.
• Fusion proteins offer a way to combine distinct protein functionalities.

Purpose of the Study:

• To design and characterize a fusion protein combining hydrophobin's surface adhesion with avidin's biotin-binding capability.
• To overcome challenges in creating fusion proteins from multimeric proteins through structural design.

Main Methods:

• Designed a fusion protein incorporating a circularly permuted dual-chain avidin and hydrophobin.
• Produced the fusion protein in Trichoderma reesei.
• Purified the protein using aqueous two-phase partitioning.
• Characterized surface adhesion and biotin-binding properties.

Main Results:

• The engineered fusion protein exhibited significantly different surface adhesive properties compared to wild-type avidin.
• The protein self-assembled into a thin layer on hydrophobic surfaces even at low concentrations.
• Demonstrated efficient binding of biotinylated compounds.

Conclusions:

• Structural design can successfully create functional fusion proteins from multimeric components.
• Protein self-assembly is an effective strategy for interface functionalization.
• The developed fusion protein holds promise for nanoscale applications requiring controlled interfacial properties.