[Nature catalysis] 我室王斌举教授发表论文:Deciphering the oxygen activation mechanism at the CuC site of particulate methane monooxygenase

发布日期:2021年04月09日   浏览次数:

我室王斌举教授在 Nature catalysis 上发表论文:Deciphering the oxygen activation mechanism at the CuC site of particulate methane monooxygenase

摘要:The enzymatic oxidation of methane to methanol was discovered in methanotrophs over 110 years ago. Nevertheless, the mechanism of action of particulate methane monooxygenase (pMMO) remains elusive, especially regarding O2 activation and the nature of the active species of the enzyme. Here we decipher the catalytic cycle of pMMO in the presence of the physiological reductant duroquinol (DQH2). We demonstrate that O2 activation is in fact initiated by a CuC(ii)–DQH species generated by deprotonation of DQH2. Our simulations capture the exclusive pathway for the sequential formation of the intermediates, CuC(ii)−O2•−, CuC(ii)−OOH and H2O2, along the O2 reduction pathway. Furthermore, H2O2 activation by CuC(ii)−DQH is initiated by dissociation of DQH to yield CuC(i), followed by CuC(i)-catalysed O−O homolysis, en route to the formation of the CuC(ii)−O•− species, which is responsible for C−H oxidations. These findings uncover the important roles of the phenol co-substrate for O2 activation and help resolve the enigmatic mechanism of pMMO.

文章链接:https://www.nature.com/articles/s41929-021-00591-4