title: Stoichiometrically Controlled Immobilization of Multiple Enzymes on Magnetic Nanoparticles by the Magnetosome Display System for Efficient Cellulose Hydrolysis.
abstract: The immobilization of multiple cellulase complexes receiving attention for use in the efficient hydrolysis of celluloses. In this study, the magnetosome display system was employed for the preparation of systems mimicking natural multiple cellulase complexes (cellulosomes) on magnetic nanoparticles (MNPs). Initially, two fluorescent proteins, namely, green fluorescent protein and mCherry, were immobilized on MNPs. Fluorescence analysis revealed the close proximity of two different proteins on the MNPs. Enzyme-linked immunosorbent assay analysis showed that stoichiometrically equivalent amounts of the proteins were immobilized on the MNPs. Next, endoglucanase (EG) and β-glucosidase (BG) were immobilized on MNPs to give EG/BG-MNPs. The resulting MNPs were applied for the hydrolysis of celluloses, with rapid hydrolysis of carboxymethyl cellulose being observed. Furthermore, the fusion of the cellulose-binding domain to EG/BG-MNPs promoted improved hydrolysis activity against the insoluble cellulose. We could therefore conclude that the magnetosome display system can expand the possibilities of mimicking natural cellulosome organization on MNPs.
authors.affiliation: Division of Biotechnology and Life Science, Institute of Engineering, Tokyo University of Agriculture and Technology , 2-24-16 Naka-cho, Koganei, Tokyo 184-8588, Japan.
authors.forename: Toru
authors.initials: T
authors.lastname: Honda
authors.affiliation: Division of Biotechnology and Life Science, Institute of Engineering, Tokyo University of Agriculture and Technology , 2-24-16 Naka-cho, Koganei, Tokyo 184-8588, Japan.
authors.forename: Tsuyoshi
authors.initials: T
authors.lastname: Tanaka
authors.affiliation: Division of Biotechnology and Life Science, Institute of Engineering, Tokyo University of Agriculture and Technology , 2-24-16 Naka-cho, Koganei, Tokyo 184-8588, Japan.
authors.forename: Tomoko
authors.initials: T
authors.lastname: Yoshino
mesh_terms: D040761:Biomimetic Materials / Q000737:chemistry*; D002266:Carboxymethylcellulose Sodium / Q000737:chemistry*; D002480:Cellulase / Q000737:chemistry* / Q000235:genetics; D044603:Cellulosomes / Q000737:chemistry*; D004797:Enzyme-Linked Immunosorbent Assay; D004800:Enzymes, Immobilized / Q000737:chemistry / Q000235:genetics; D004926:Escherichia coli / Q000235:genetics / Q000378:metabolism; D015870:Gene Expression; D049452:Green Fluorescent Proteins / Q000737:chemistry; D006868:Hydrolysis; D008164:Luminescent Proteins / Q000737:chemistry; D058185:Magnetite Nanoparticles / Q000737:chemistry* / Q000648:ultrastructure; D055944:Magnetosomes / Q000737:chemistry* / Q000235:genetics; D042201:Magnetospirillum / Q000737:chemistry / Q000378:metabolism; D011994:Recombinant Proteins / Q000737:chemistry / Q000235:genetics; D013237:Stereoisomerism; D014169:Transformation, Bacterial; D001617:beta-Glucosidase / Q000737:chemistry* / Q000235:genetics; D000097573:Red Fluorescent Protein
chemical_list: D002266:Carboxymethylcellulose Sodium; D002480:Cellulase; D004800:Enzymes, Immobilized; D049452:Green Fluorescent Proteins; D008164:Luminescent Proteins; D058185:Magnetite Nanoparticles; D011994:Recombinant Proteins; D001617:beta-Glucosidase; D000097573:Red Fluorescent Protein