期刊
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
卷 413, 期 27, 页码 6793-6802出版社
SPRINGER HEIDELBERG
DOI: 10.1007/s00216-021-03273-z
关键词
Microelectrodes; Enzymes; Activity; Crosslinker; D-Serine
资金
- Natural Sciences and Engineering Research Council of Canada (NSERC)
- MITACS
- Fondo di Ateneo per la Ricerca
The study presented a method to measure the effect of enzyme immobilization and cross-linking on enzyme activity and substrate specificity, confirming that immobilization affects the substrate specificity of the enzyme.
Challenges facing enzyme-based electrochemical sensors include substrate specificity, batch to batch reproducibility, and lack of quantitative metrics related to the effect of enzyme immobilization. We present a quick, simple, and general approach for measuring the effect of immobilization and cross-linking on enzyme activity and substrate specificity. The method can be generalized for electrochemical biosensors using an enzyme that releases hydrogen peroxide during its catalytic cycle. Using as proof of concept RgDAAO-based electrochemical biosensors, we found that the Michaelis-Menten constant (K-m) decreases post immobilization, hinting at alterations in the enzyme kinetic properties and thus substrate specificity. We confirm the decrease in K-m electrochemically by characterizing the substrate specificity of the immobilized RgDAAO using chronoamperometry. Our results demonstrate that enzyme immobilization affects enzyme substrate specificity and this must be carefully evaluated during biosensor development.
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