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Reusable amperometric biosensor for measuring protein tyrosine kinase activity
Chung-Liang Wang1, Lan-Yi Wei, Chiun-Jye Yuan
1Department of Biological Science and Technology, National Chiao Tung University, Hsinchu, Taiwan, ROC.
Analytical Chemistry
|January 3, 2012
Summary
A novel biosensor detects protein tyrosine kinase activity using tyrosinase. This label-free method is sensitive, reusable, and effective for analyzing kinase inhibitors, offering a simple approach for enzyme activity measurement.
Area of Science:
- Biochemistry
- Enzyme kinetics
- Biosensor technology
Background:
- Protein tyrosine kinases (PTKs) play crucial roles in cellular signaling pathways.
- Dysregulation of PTK activity is implicated in various diseases, including cancer.
- Sensitive and specific methods for PTK activity detection are essential for research and drug discovery.
Purpose of the Study:
- To develop a simple, low-cost, and reusable label-free biosensor for detecting protein tyrosine kinase activity.
- To utilize a tyrosinase-based amperometric biosensor for quantifying the activity of p60c-src protein tyrosine kinase (Src).
- To investigate the biosensor's performance in detecting kinase inhibitors.
Main Methods:
- Development of a tyrosinase-based amperometric biosensor.
- Utilizing a specific peptide substrate for p60c-src protein tyrosine kinase (Src).
- Amperometric detection of tyrosine oxidation, inhibited by phosphorylation.
Main Results:
- The developed tyrosine kinase biosensor demonstrated high sensitivity to Src activity with a linear dynamic range of 1.9-237.6 U/mL and a detection limit of 0.23 U/mL.
- The biosensor allowed repetitive measurements of tyrosine kinase activity without regeneration.
- The biosensor successfully differentiated the inhibitory effects of various kinase inhibitors on Src activity, including Src-specific and universal inhibitors.
Conclusions:
- The developed tyrosinase-based amperometric biosensor provides a sensitive, reusable, and label-free method for detecting protein tyrosine kinase activity.
- This biosensor is effective for evaluating the inhibitory effects of kinase inhibitors.
- The findings suggest broad applicability for measuring tyrosine kinase activities and their interactions with reagents.
