At the journal club meeting Dr. Mehdi Mogharabi gave a presentation about artificial enzymes. All living things in nature maintain their internal metabolic balances quite well when they are in healthy conditions. In other words, metabolic materials are in equilibria in each living creature primarily in a collaboration of biological catalyses by numerous enzymes. In consideration of such physicochemical roles of enzyme proteins, we are allowed to use man-made materials for construction of artificial enzymes that are capable of simulating catalytic functions demonstrated by enzyme proteins.