A Dual Anchoring Strategy for the Localization and Activation of Artificial Metalloenzymes Based on the Biotin–Streptavidin Technology
摘要:
Artificial metalloenzymes result from anchoring an active catalyst within a protein environment. Toward this goal, various localization strategies have been pursued: covalent, supramolecular, or dative anchoring. Herein we show that introduction of a suitably positioned histidine residue contributes to firmly anchor, via a dative bond, a biotinylated rhodium piano stool complex within streptavidin. The in silico design of the artificial metalloenzyme was confirmed by X-ray crystallography. The resulting artificial metalloenzyme displays significantly improved catalytic performance, both in terms of activity and selectivity in the transfer hydrogenation of imines. Depending on the position of the histidine residue, both enantiomers of the salsolidine product can be obtained.
Synthesis and Structure of Protic Amine Tethered Rhodium(III) Peralkylcyclopentadienyl Complexes
摘要:
A series of mononuclear tethered complexes, Rh(III)-(eta(5):eta(1)-Cp'-NHR), in which the eta(5)-peralkylcyclopentadienyl group and the ligated protic amine group are connected by suitable carbon chains, were newly prepared and structurally characterized. Their catalytic performance in the reductive amination of carbonyl compounds was significantly influenced by the chain length of the tether, which possibly plays a key role in determining the reaction course.
Modulating the water oxidation catalytic activity of iridium complexes by functionalizing the Cp*-ancillary ligand: hints on the nature of the active species
作者:Giordano Gatto、Alice De Palo、Ana C. Carrasco、Ana M. Pizarro、Stefano Zacchini、Guido Pampaloni、Fabio Marchetti、Alceo Macchioni
DOI:10.1039/d0cy02306j
日期:——
A comparative study on the behavior of a series of iridium dimeric WOCs with modified Cp* ligands reveals the key role played by the variable substituent.