Protein-polyelectrolyte complexes to improve the biological activity of proteins in layer-by-layer assemblies

Area of Science:

• Biotechnology
• Materials Science
• Biochemistry

Background:

• Protein immobilization is crucial for various biotechnological and biomedical applications.
• Traditional methods face limitations in maintaining protein activity and creating stable structures.

Purpose of the Study:

• To develop a novel and efficient method for protein immobilization.
• To investigate the properties of protein-polyelectrolyte complexes (PPCs) for layer-by-layer assembly.
• To evaluate the biological activity of immobilized proteins using this new approach.

Main Methods:

• Utilized protein-polyelectrolyte complexes (PPCs) as building blocks.
• Employed layer-by-layer assembly technique for creating multilayers.
• Assessed the biological activity and specific activity of immobilized enzymes, exemplified by lysozyme-poly(styrene sulfonate) complexes.

Main Results:

• Achieved thicker multilayers with a higher polyelectrolyte fraction using PPCs compared to single protein molecules.
• Demonstrated that biological activity is maintained and specific activity is enhanced in the PPC-based assemblies.
• Observed a more hydrated state of the protein assemblies, contributing to improved activity.

Conclusions:

• The proposed method using PPCs for layer-by-layer assembly offers a superior approach to protein immobilization.
• This technique preserves and enhances protein biological activity, attributed to the hydrated nature of the assemblies.
• The findings open new avenues for advanced biotechnology and biomedical applications requiring stable and active immobilized proteins.