Role of hydrogen bond connecting ligands for substrate and type i copper in copper(i) oxidase cueo

摘要

Mutational and kinetic studies on Asp439, a ligand for the substrate-binding site in the copper(I) oxidase—CueO—and the deletion mutant—Δα5–7 CueO—indicated that the electron transfer from the copper(I) ion as the substrate to the type I copper is performed though the hydrogen bond between Asp439 and His443, a ligand for the type I copper, and also by means of the through-space mechanism directly.