Tyrosinase-mediated Peptide Conjugation with Chitosan-coated Gold Nanoparticles

The conjugation of biomolecules, such as protein, sugar, and DNA, with metal nanoparticles is an important technique for bioassay and biomaterial preparation. In this study, we aim to enzymatically immobilize a functional peptide on gold nanoparticles (AuNPs) using a single-step reaction. We used ty...

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Bibliographic Details
Published in:Analytical Sciences 2019/01/10, Vol.35(1), pp.79-83
Main Authors: SAKONO, Naomi, NAKAMURA, Kosuke, OHSHIMA, Tatsuki, HAYAKAWA, Ryoto, SAKONO, Masafumi
Format: Article
Language:English
Subjects:
Analytical Chemistry
Bioassays
Bioconjugation
Biomaterials
Biomedical materials
Biomolecules
Caspase
Caspase-3
caspase-3 activity assay
Catechol
Catechol oxidase
Chemical compounds
Chemistry
Chitosan
Chitosan - chemistry
Chlorides - chemistry
Coated particles
Coatings
Conjugation
Deoxyribonucleic acid
Dihydroxyphenylalanine
DNA
Enzymes, Immobilized - chemistry
Fluorescence
Fluorescent Dyes - chemistry
functional nanoparticles
Gold
Gold Compounds - chemistry
Immobilization
Luminescent Measurements
Metal Nanoparticles - chemistry
Monophenol Monooxygenase - chemistry
Nanoparticles
Peptides
Peptides - chemistry
Quinones
Substrates
Sugar
Tyrosinase
Tyrosine
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Summary:The conjugation of biomolecules, such as protein, sugar, and DNA, with metal nanoparticles is an important technique for bioassay and biomaterial preparation. In this study, we aim to enzymatically immobilize a functional peptide on gold nanoparticles (AuNPs) using a single-step reaction. We used tyrosinase, a catechol oxidase, to immobilize an enzymatic peptide. We performed immobilization experiments of a fluorescent compound-linked caspase-3 substrate peptide using tyrosinase on chitosan-coated AuNPs. Peptides were effectively immobilized onto the AuNPs depending on the presence of tyrosine within the sequence, which suggests the DOPA-quinone produced from tyrosine, via tyrosinase, is connected to the chitosan amino group. Although fluorescent emission from the immobilized capase-3 substrate was quenched by AuNPs, fluorescence intensity recovery occurred due to the addition of caspase-3. Thus, we were able to easily prepare functional AuNPs that can be used for a caspase-3 activity assay. Our results indicate that the tyrosinase-mediated peptide link to chitosan-coated particles is a useful technique for preparing functionalized nanoparticles.
ISSN:0910-6340
1348-2246
DOI:10.2116/analsci.18SDP03