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PQQ glucose dehydrogenase with novel electron transfer ability
1Department of Biotechnology, Faculty of Technology, Tokyo University of Agriculture and Technology, 2-24-16 Nakamachi, Koganei, 184-8588, Tokyo, Japan.
Biochemical and Biophysical Research Communications
|January 27, 2004
Summary
Researchers engineered PQQ glucose dehydrogenase (GDH-B) by fusing a cytochrome c domain. This fusion enables direct electron transfer to electrodes for advanced glucose sensing without mediators.
Area of Science:
- Biochemistry
- Enzyme Engineering
- Biosensors
Background:
- Pyrroloquinoline quinone (PQQ) glucose dehydrogenase (GDH-B) from Acinetobacter calcoaceticus is valuable for glucose sensing due to high activity and oxygen insensitivity.
- Direct electron transfer to electrodes is desirable for glucose biosensors to eliminate mediators.
Purpose of the Study:
- To engineer GDH-B for direct electron transfer to an electrode.
- To mimic the domain structure of quinohemoprotein ethanol dehydrogenase (QH-EDH) for enhanced functionality.
Main Methods:
- Genetic fusion of the cytochrome c domain from QH-EDH to the C-terminus of GDH-B.
- Characterization of the resulting fusion protein's electron transfer properties.
Main Results:
- The engineered fusion protein demonstrated intramolecular electron transfer from PQQ to the heme group of the cytochrome c domain.
- Efficient electron transfer from the heme group to the electrode was achieved.
Conclusions:
- The fusion protein facilitates direct electron transfer, enabling the development of mediator-less glucose biosensors.
- This engineered enzyme represents a significant advancement in glucose sensing technology.