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Redox modification of proteins using sequential-parallel electrochemistry in microtiter plates.
S Reiter1, K Eckhard, A Blöchl
1Anal. Chem.-Elektroanalytik & Sensorik, Ruhr-Universität Bochum, Germany. Sabine.Reiter@ruhr-uni-bochum.de
The Analyst
|January 5, 2002
Summary
This study optimized redox modification of proteins for biosensors using a novel multi-electrode system. The developed
Area of Science:
- Electrochemistry
- Biochemistry
- Biosensor technology
Background:
- Redox modification enhances protein electron-transfer for biosensors.
- Coordinative labeling of histidine residues with ruthenium complexes is a common method.
- Optimization of these labeling procedures is complex and protein-specific.
Purpose of the Study:
- To develop and utilize a multi-electrode sequential analyzer (MESA) for optimizing protein modification.
- To investigate the ligand exchange reaction for ruthenium complex binding to histidine residues.
- To optimize the selective labeling of glucose dehydrogenase (sGDH) and glucose oxidase (GOx) with ruthenium complexes.
Main Methods:
- Development of a MESA system for sequential-parallel reaction monitoring.
- Electrochemical measurements (cyclic voltammetry, differential pulse voltammetry) in microtiter plates.
- Investigation using imidazole as a model compound and subsequent enzyme labeling.
Main Results:
- The MESA system successfully monitored modification reactions.
- Optimized conditions were determined for selective ruthenium complex labeling of sGDH and GOx.
- Characterization of the electrochemical and biological properties of the resulting 'electroenzymes' was performed.
Conclusions:
- The MESA system provides an efficient platform for optimizing protein redox modification.
- Selective and optimized labeling yields 'electroenzymes' with desirable properties for biosensor applications.
- This approach facilitates the development of advanced amperometric biosensors.