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A modified Cp*Ru complex, equipped with a maleimide group, was covalently attached to a cysteine of an engineered variant of Ferric hydroxamate uptake protein component: A (FhuA). This synthetic metalloprotein catalyzed the intermolecular alkene-alkyne coupling of 3-butenol with 5-hexynenitrile. When compared with the protein-free Cp*Ru catalyst, the biohybrid catalyst produced the linear product with higher regioselectivity.
An artificial metalloprotein harboring an [(η
5
-pentamethylcyclopentadienyl)ruthenium(
ii
)] catalyst for the alkene-alkyne coupling reaction was developed.