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A Microfluidic Chip for the Versatile Chemical Analysis of Single Cells
Published on: October 15, 2013
A dual fluorescent/MALDI chip platform for analyzing enzymatic activity and for protein profiling
Vincentius A Halim1, Alexander Muck, Markus Hartl
1Mass Spectrometry Research Group, Max Planck Institute for Chemical Ecology, Jena, Germany.
Proteomics
|December 5, 2008
Summary
We developed a dual fluorescence and MALDI-TOF-MS assay for rapid protease activity detection. This method effectively screens protease inhibitors (PIs), showing potential for discovering new antiviral drugs.
Area of Science:
- Biochemistry
- Analytical Chemistry
- Molecular Biology
Background:
- Rapid and sensitive detection of enzymatic activity is crucial for biological sample screening.
- Protease inhibitors (PIs) play a vital role in plant defense mechanisms against various threats.
Purpose of the Study:
- To develop a novel, dual-readout assay for quantifying protease activity in the presence of protease inhibitors.
- To apply this assay for screening the inhibitory effects of plant-derived PIs on trypsin activity.
Main Methods:
- Utilized copolymer pMALDI target chips for sample analysis and rapid protein digestion.
- Employed fluorescamine labeling for fluorescence-based detection of tryptic peptides.
- Integrated MALDI-TOF-MS for specific tryptic peptide identification and assay validation.
Main Results:
- Demonstrated a simple, affordable assay with strong fluorescence signal and low background.
- Successfully applied the dual-readout method to screen plant PIs from Solanum nigrum against trypsin.
- Observed decreased fluorescence and MALDI-TOF-MS signals correlating with PI inhibitory activity.
Conclusions:
- The developed dual fluorescence/MALDI-TOF-MS platform offers a robust method for assaying protease activity and screening protease inhibitors.
- This platform can be adapted for the discovery of novel protease inhibitors, including those with potential antiviral applications against HIV and hepatitis C.
