Coupling biomolecules to fullerenes through a molecular adapter.

Area of Science:

• Nanomaterials Science
• Bioconjugation Chemistry
• Enzyme Immobilization

Background:

• Fullerenes (C60) are insoluble in aqueous media, limiting their use in biological applications.
• Attaching proteins to nanomaterials often requires robust and efficient conjugation strategies.
• Biotin-streptavidin interaction is a high-affinity biological recognition system.

Purpose of the Study:

• To synthesize a novel biotinylated fullerene derivative.
• To establish a method for attaching biotin-conjugated proteins to C(60) using streptavidin as a molecular adapter.
• To demonstrate the utility of this system for enzyme immobilization and recovery.

Main Methods:

• Synthesis of a biotinylated fullerene.
• Utilizing streptavidin as a linker between biotinylated fullerene and biotinylated proteins.
• Immobilization of biotinylated alkaline phosphatase onto the fullerene-streptavidin complex.
• Enzyme activity assay and recovery assessment post-centrifugation.

Main Results:

• Successful synthesis of biotinylated fullerene.
• Demonstration of efficient attachment of biotinylated alkaline phosphatase to C(60) via streptavidin.
• Recovered immobilized enzyme retained significant biological activity after centrifugation.
• Overcoming fullerene insolubility challenges in aqueous biological systems.

Conclusions:

• The developed biotinylated fullerene system provides an effective platform for protein immobilization.
• Streptavidin serves as a versatile molecular adapter for fullerene-biomolecule conjugation.
• This approach offers a method for stable enzyme immobilization with easy recovery and minimal activity loss.