Matrix metalloproteinase-2 (MMP-2) is closely related to the proliferation and invasion of various types of cancers. The protease is secreted by malignant tumor cells, thus allowing the enzyme to serve as a biomarker for cancer diagnosis. Methods have been developed to analyze MMP-2 activities; however, their applications to disease diagnosis have not been widely demonstrated yet because of the need for highend analytical equipment and labor-intensive processes. In this study, we developed an MMP-2 activity assay system by integrating an engineered autoinhibited β-lactamase which can be activated by MMP-2 in an optical sensing system consisting of reassembled common electronic components, such as a laser diode, a solar cell, and a multimeter. The autoinhibited β-lactamase was immobilized on a polymeric biosensing channel by a polydopamine coating and self-assembled monolayer methods. In the presence of MMP-2, the immobilized autoinhibited β-lactamase was converted to an active form that hydrolyzed the chromogenic cephalosporin CENTA, thereby changing the substrate color from pale yellow (λmax=340 nm) to highly discernible chrome yellow (λmax=405 nm). By reading the interfered laser-light intensity, we were able to analyze MMP-2 activities precisely both with the samples prepared in a buffer solution and also those in urine. These results suggested that the developed system can be used for the quantitative analysis of enzyme activity related to cancer diagnosis.
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Zhang, C.Q., Park, Y.M., Yang, D. et al. Development of a matrix metalloproteinase-2 (MMP-2) biosensing system by integrating an enzyme-mediated color development reaction into a common electronics components setup. BioChip J 10, 198–207 (2016). https://doi.org/10.1007/s13206-016-0306-5
- Matrix metalloproteinase-2
- Autoinhibited β-lactamase
- Optical biosensor