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Enzyme activation for activator and enzyme activity measurement
1Max Delbrück Centre of Molecular Medicine, Department of Biosensors, Berlin, Germany.
Biosensors & Bioelectronics
|January 1, 1993
Summary
This study introduces a novel biosensor for detecting glycogen phosphorylase and its effector AMP. The enzyme-based sensor offers sensitive and specific measurements for these crucial biological molecules.
Area of Science:
- Biochemistry
- Enzyme kinetics
- Biosensor technology
Background:
- Glycogen phosphorylase (GP) plays a key role in glycogen metabolism.
- Allosteric effectors like adenosine monophosphate (AMP) modulate GP activity.
- Accurate determination of GP and AMP is essential for understanding metabolic pathways.
Purpose of the Study:
- To develop a novel sensing principle for enzyme activation.
- To create a biosensor for the determination of glycogen phosphorylase b (GPb) and its allosteric effector AMP.
- To establish a reagentless sensor for inorganic phosphate.
Main Methods:
- Enzyme sequence comprising coentrapped alkaline phosphatase, mutarotase, and glucose oxidase on a hydrogen peroxide indicating electrode.
- Detection of glucose-1-phosphate formation as an indicator of GP-catalyzed glycogen phosphorolysis.
- Coupling of glycogen-entrapped phosphorylases to a three-enzyme indicator membrane for AMP and phosphate sensing.
Main Results:
- The three-enzyme sensor determined GP (isoforms a and b) in the range of 0.005–0.2 U/mL.
- The biosensor responded to AMP in the concentration range of 5–150 µM.
- The reagentless phosphate sensor showed a linear calibration graph between 0.05–1 mM.
Conclusions:
- A new enzyme activation sensing principle was demonstrated.
- The developed biosensor is effective for quantifying GPb and AMP.
- The sensor system provides a sensitive platform for biochemical analysis.