Development of Integrated Transistor Based device for Monitoring of Enzymatic Activities as Next-generation Platform for Apoptosis Pathways Analysis

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We envisioned the development of an integrated transistor based device that is able to quantify enzymatic activities in cells. Caspase-3 and -8 were studied as targets relevant to apoptosis pathway analysis. A series of peptides containing each Caspase-specific amino acid sequence along with spacer and cysteine moiety were prepared so that they will have good enzyme-accssibility and affinity to gold for the immobilization. Mass-spectroscopic analysis uncovered that these designed reactions take place in quantitative and each substrate-specific fashion. This reaction could also be visualized on the basis of the coloration of gold nano-particle. Furthermore, it was compatible with potentiometric detection format, indicating the validity of our approach.