Multifunctional conjugation of proteins on/into bio-nanoparticles prepared by amphiphilic poly(γ-glutamic acid)

Author： Akagi Takami Kaneko Tatsuo Kida Toshiyuki Akashi Mitsuru

ISSN： 1568-5624

Source： Journal of Biomaterials Science, Polymer Edition, Vol.17, Iss.8, 2006-08, pp. : 875-892

Disclaimer: Any content in publications that violate the sovereignty, the constitution or regulations of the PRC is not accepted or approved by CNPIEC.

Previous Menu Next

Abstract

The present study focuses on nanoparticles composed of amphiphilic poly(γ-glutamic acid) (γ-PGA) as potential protein carriers. Amphiphilic graft co-polymers composed of γ-PGA as the hydrophilic backbone and L-phenylalanine ethylester (L-PAE) as the hydrophobic segment were synthesized by grafting L-PAE to γ-PGA using water-soluble carbodiimide (WSC). Due to their amphiphilic properties, the γ-PGA-graft-L-PAE co-polymer formed monodispersed nanoparticles in water. The particle size of the nanoparticles composed of γ-PGA-graft-L-PAE (γ-PGA nanoparticles) was about 200 nm and showed a highly negative zeta potential. To evaluate their potential applications as multifunctional protein carrier, we prepared protein-entrapped γ-PGA nanoparticles by encapsulation, covalent immobilization or physical adsorption methods. For this purpose, 11 different proteins with various molecular weights and isoelectric points (pI values) were used as model proteins. The encapsulation of the protein into the nanoparticles was observed for all tested proteins. The amount of protein covalently immobilized or adsorbed onto the nanoparticles showed different tends based on the molecular weight and pI of each protein. Positively charged proteins could be adsorbed onto the negatively charged nanoparticles by electrostatic interaction. Moreover, it was found that enzyme-encapsulated nanoparticles showed higher enzymatic activity than surface-immobilized nanoparticles. These results indicated that the enzymatic activity of the enzyme-entrapped nanoparticles was significantly affected by the conjugation method, and that encapsulation was the optimal method for the conjugation of proteins and nanoparticles. It is expected that the γ-PGA nanoparticle will have great potential as multifunctional carriers in pharmaceutical and biomedical applications, such as drug and vaccine delivery systems.

Related content

Removal of Cr(III), Ni(II) and Cu(II) by poly(γ-glutamic acid) from Bacillus subtilis NX-2

By Yao Jun Xu Hong Wang Jun Jiang Min Ouyang Pingkai

Journal of Biomaterials Science, Polymer Edition, Vol. 18, Iss. 2, 2007-02 ,pp. : 193-204 (12)

Taylor & Francis Ltd

Access to resources Recommend Favorite

Nanoparticles Made of Microbial Poly(γ-glutamate)s for Encapsulation and Delivery of Drugs and Proteins

By Portilla-Arias José A. Camargo Beatriz García-Alvarez Montserrat de Ilarduya Antxon Martínez Muñoz-Guerra Sebastián

Journal of Biomaterials Science, Polymer Edition, Vol. 20, Iss. 7-8, 2009-04 ,pp. : 1065-1079 (15)

Taylor & Francis Ltd

Access to resources Recommend Favorite

The role of hydrophobicity in the disruption of erythrocyte membrane by nanoparticles composed of hydrophobically modified poly(γ-glutamic acid)

By Shima Fumiaki Akagi Takami Akashi Mitsuru

Journal of Biomaterials Science, Polymer Edition, Vol. 25, Iss. 2, 2014-01 ,pp. : 203-210 (8)

Taylor & Francis Ltd

Access to resources Recommend Favorite

Bacterial-Derived Polymer Poly-γ-Glutamic Acid (γ-PGA)-Based Micro/Nanoparticles as a Delivery System for Antimicrobials and Other Biomedical Applications

By Khalil Ibrahim R. Burns Alan T. H. Radecka Iza Kowalczuk Marek Khalaf Tamara Adamus Grazyna Johnston Brian Khechara Martin P.

International Journal of Molecular Sciences, Vol. 18, Iss. 2, 2017-02 ,pp. : 313-313 (1)

MDPI

Access to resources Recommend Favorite

Poly‐γ‐glutamic acid produced from Bacillus licheniformis CGMCC 2876 as a potential substitute for polyacrylamide in the sugarcane industry

BIOTECHNOLOGY PROGRESS (ELECTRONIC), Vol. 31, Iss. 5, 2015-09 ,pp. : 1287-1294 (8)

John Wiley & Sons Inc

Access to resources Recommend Favorite