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Artificial Metalloenzymes based on TetR Proteins and Cu(II) for Enantioselective Friedel-Crafts Alkylation Reactions

de Souza, C. G., Roelfes, G. & Bersellini, M., 18-Jun-2020, In : ChemCatChem. 12, 12, p. 3190-3194 6 p.

Research output: Contribution to journalArticleAcademicpeer-review

The supramolecular approach is among the most convenient methodologies for creating artificial metalloenzymes (ArMs). Usually this approach involves the binding of a transition metal ion complex to a biomolecular scaffold via its ligand, which also modulates the catalytic properties of the metal ion. Herein, we report ArMs based on the proteins CgmR, RamR and QacR from the TetR family of multidrug resistance regulators (MDRs) and Cu2+ ions, assembled without the need of a ligand. These ArMs catalyze the enantioselective vinylogous Friedel-Crafts alkylation reaction with up to 75 % ee. Competition experiments with ethidium and rhodamine 6G confirm that the reactions occur in the chiral environment of the hydrophobic pocket. It is proposed that the Cu2+-substrate complex is bound via a combination of electrostatic and pi-stacking interactions provided by the second coordination sphere. This approach constitutes a fast and straightforward way to assemble metalloenzymes and may facilitate future optimization of the protein scaffolds via mutagenesis or directed evolution approaches.

Original languageEnglish
Pages (from-to)3190-3194
Number of pages6
JournalChemCatChem
Volume12
Issue number12
Early online date17-Apr-2020
Publication statusPublished - 18-Jun-2020

    Keywords

  • artificial metalloenzymes, biocatalysis, Friedel-Crafts alkylation, Cu(II) ion, TetR proteins, RESISTANCE, CATALYSTS, DESIGN, LMRR

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