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Detection of Protease Activity by Fluorescent Peptide Zymography
Published on: January 20, 2019
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Peptide-modified nanochannel system for carboxypeptidase B activity detection
Xiaotong Zhang1, Ling Zhang1, Jinghong Li1
1Department of Chemistry, Key Laboratory of Bioorganic Phosphorus Chemistry & Chemical Biology, Tsinghua University, Beijing 100084, China.
Analytica Chimica Acta
|March 6, 2019
Summary
A novel nanochannel system sensitively detects Carboxypeptidase B (CPB) activity by monitoring peptide hydrolysis. This method offers rapid and specific CPB detection, showing promise for pancreatitis diagnosis.
Area of Science:
- Biochemistry
- Analytical Chemistry
- Nanotechnology
Background:
- Carboxypeptidase B (CPB) is a crucial protease for biological analysis, peptide sequencing, and protein engineering.
- Monitoring CPB activity and inhibition is significant in various scientific applications.
Purpose of the Study:
- To develop a sensitive and easily-prepared nanochannel system for CPB activity detection.
- To utilize the hydrolysis characteristic of CPB for detecting its activity within nanochannels.
Main Methods:
- Assembling peptides composed of alkaline amino acids into nanochannels.
- Detecting CPB activity by observing changes in ionic current due to peptide cleavage.
- Evaluating the system's sensitivity, linear range, and response time.
Main Results:
- The nanochannel system demonstrated high sensitivity with a detection limit of 0.01 U/mL.
- A wide linear range (0.01-10 U/mL) and fast response (<10 s) were achieved for CPB detection.
- The system successfully detected CPB inhibitors and activity in complex samples.
Conclusions:
- The developed nanochannel system offers effective analytical characteristics for CPB detection.
- This strategy holds promise for the rapid diagnosis of pancreatitis.
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