A Metal Ion Regulated Artificial Metalloenzyme
Regulation of enzyme activity is essential in living cells. The rapidly increasing number of designer enzymes with new-to-nature activities makes it necessary to develop novel strategies for controlling their catalytic activity. Here we present the development of a metal ion regulated artificial metalloenzyme created by combining two anchoring strategies, covalent and supramolecular, for introducing a regulatory and a catalytic site, respectively. This artificial metalloenzyme is activated in the presence of Fe2+ ions, but only marginally in the presence of Zn2+.
Ligand type: BypyridineHost protein: LmrRReaction: Friedel-Crafts alkylationMax TON: 14ee: 75PDB: ---Notes: ---
(η6-Arene) Ruthenium(II) Complexes and Metallo-Papain Hybrid as Lewis Acid Catalysts of Diels–Alder Reaction in Water
Covalent embedding of a (η6-arene) ruthenium(II) complex into the protein papain gives rise to a metalloenzyme displaying a catalytic efficiency for a Lewis acid-mediated catalysed Diels–Alder reaction enhanced by two orders of magnitude in water.