Researchers at Tokyo Tech have demonstrated that in-cell engineering is an effective method for creating functional protein crystals with promising catalytic properties. By harnessing genetically altered bacteria as a green synthesis platform, the researchers produced hybrid solid catalysts for arti
bacteria, where the produced monomers formed trimers that, in turn, spontaneously assembled into stable polyhedra crystals by binding to each other through their N-terminal α-helix . Additionally, the researchers introduced a modified version of the formate dehydrogenase gene from agenome. This gene caused the bacteria to produce FDH enzymes with H1 terminals, leading to the formation of hybrid H1-FDH@PhC crystals within the cells.
Through this ingenious process, the team managed to produce highly active, recyclable, and thermally stable EY·H1-FDH@PhC catalysts that can convert carbon dioxide into formate upon exposure to light, mimicking photosynthesis. In addition, they maintained 94.4% of their catalytic activity after immobilization compared to that of the free enzyme.
Overall, this study showcases the potential of bioengineering in facilitating the synthesis of complex functional materials. “The combination oftechniques for the encapsulation of protein crystals will likely provide an effective and environmentally friendly strategy for research in the areas of nanomaterials and artificial photosynthesis,” concludes Prof. Ueno.
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