期刊
INORGANIC CHEMISTRY
卷 62, 期 10, 页码 4066-4075出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.inorgchem.2c03742
关键词
-
The cytochrome bd oxygen reductase is able to catalyze the reduction of dioxygen to water. Its structure reveals three heme molecules in the active site, which differentiates it from heme-copper cytochrome c oxidase. The reaction mechanism of this metalloenzyme was explored using quantum chemical cluster approach. The calculations suggest that a series of proton-coupled electron transfers and outer-sphere electron transfers are responsible for the efficient oxygen reduction of this enzyme.
The cytochrome bd oxygen reductase catalyzes the four-electron reduction of dioxygen to two water molecules. The structure of this enzyme reveals three heme molecules in the active site, which differs from that of heme-copper cytochrome c oxidase. The quantum chemical cluster approach was used to uncover the reaction mechanism of this intriguing metalloenzyme. The calculations suggested that a proton-coupled electron transfer reduction occurs first to generate a ferrous heme b595. This is followed by the dioxygen binding at the heme d center coupled with an outer-sphere electron transfer from the ferrous heme b595 to the dioxygen moiety, affording a ferric ion superoxide intermediate. A second proton-coupled electron transfer produces a heme d ferric hydroperoxide, which undergoes efficient O-O bond cleavage facilitated by an outer-sphere electron transfer from the ferrous heme b595 to the O-O sigma* orbital and an inner-sphere proton transfer from the heme d hydroxyl group to the leaving hydroxide. The synergistic benefits of the two types of hemes rationalize the highly efficient oxygen reduction repertoire for the multi-heme-dependent cytochrome bd oxygen reductase family.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据