Engineering a Binding Peptide for Oriented Immobilization and Efficient Bioelectrocatalytic Oxygen Reduction of
Meng Zhang1,2, Xiufeng Wang3, Weisong Liu2,4
1College of Biotechnology, Tianjin University of Science & Technology, Tianjin 300457, P. R. China.
ACS Applied Materials & Interfaces
|December 18, 2024
Summary
Researchers engineered surface-binding peptides (SBPs) to improve enzyme stability and efficiency in enzymatic fuel cells (EFCs). These SBPs enable oriented enzyme immobilization, significantly boosting electrocatalytic performance for renewable energy applications.
Area of Science:
- Bioelectrocatalysis
- Renewable Energy Technologies
- Biomedical Applications
Background:
- Enzymatic fuel cells (EFCs) offer high efficiency for renewable energy conversion but suffer from poor cathode stability and catalytic efficiency.
- Oriented immobilization of multicopper oxidases is crucial for enhancing heterogeneous electron transfer in EFCs.
Purpose of the Study:
- To engineer surface-binding peptides (SBPs) for oriented immobilization of oxidoreductases.
- To enhance the stability and catalytic efficiency of enzymes used in EFCs.
- To overcome current limitations in bioelectrocatalysis for EFC applications.
Main Methods:
- Semirational design and site-saturation mutagenesis of a methionine-rich fragment from E. coli CueO to identify SBPs.
- Electrochemical screening and electrocatalytic kinetics analysis of engineered enzyme variants.
- Fusion of engineered SBPs to laccase (BpL) and bilirubin oxidase (MvBOD) for performance evaluation in EFCs.
Main Results:
- Identification of a 13-amino acid SBP (SBP 1.0) and its enhanced variant (SBP 2.0) from E. coli CueO.
- Engineered variant CueO-M12-1 (CueO-M12 H398I) showed a 1.38-fold increase in current density and a 21.2-fold improvement in kinetics current density.
- SBPs facilitated rapid and oriented immobilization of BpL and MvBOD, enhancing their electrocatalytic capabilities and EFC performance.
Conclusions:
- Engineered SBPs act as versatile linkers for oriented immobilization of oxidoreductases.
- This approach significantly improves enzyme stability and electrocatalytic efficiency in EFCs.
- The developed SBPs represent a breakthrough in bioelectrocatalysis, addressing key bottlenecks in EFC technology.
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