화학공학소재연구정보센터
Catalysis Letters, Vol.138, No.1-2, 62-67, 2010
Photoregulating Catalytic Activity of Cyclodextrin-Based Artificial Glutathione Peroxidase by Charged Azobenzene
Modulating the activities of enzymes by using an external signal is widely used for many applications. In this paper, it has been performed for the first time that photoregulating the activity of artificial glutathione peroxidase (GPx) by using photocontrolled inclusion-exclusion reaction of the azobenzene with two typical GPx mimics, the telluride beta-Cyclodextrin (beta-CD) dimmer and the ditelluride beta-CD dimmer. The activities of both mimics were differently inhibited by either cationic or anionic azobenzene, owing to the catalytic capacity variance of the telluride moieties of the mimics and the different strength of the electrostatic interactions between the charges of the substrates and the azobenzenes. The inclusion of the anionic azobenzene with the ditelluride beta-CD dimmer represented the largest inhibition rate. When the inclusion was irradiated upon UV light, the activity recovered, whereas inhibited again upon visible light. Such process could be repeated many times and a switchable artificial enzyme based on the reaction was proposed.