National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)
R35GM118035
米国
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)
R01GM111097
米国
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)
T32GM105538
米国
National Institutes of Health/National Institute of Environmental Health Sciences (NIH/NIEHS)
F31ES034283
米国
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)
T32GM008382
米国
National Science Foundation (NSF, United States)
MCB-1908587
米国
引用
ジャーナル: Nat Catal / 年: 2023 タイトル: Product analog binding identifies the copper active site of particulate methane monooxygenase. 著者: Frank J Tucci / Richard J Jodts / Brian M Hoffman / Amy C Rosenzweig / 要旨: Nature's primary methane-oxidizing enzyme, the membrane-bound particulate methane monooxygenase (pMMO), catalyzes the oxidation of methane to methanol. pMMO activity requires copper, and decades of ...Nature's primary methane-oxidizing enzyme, the membrane-bound particulate methane monooxygenase (pMMO), catalyzes the oxidation of methane to methanol. pMMO activity requires copper, and decades of structural and spectroscopic studies have sought to identify the active site among three candidates: the Cu, Cu, and Cu sites. Challenges associated with the isolation of active pMMO have hindered progress toward locating its catalytic center. However, reconstituting pMMO into native lipid nanodiscs stabilizes its structure and recovers its activity. Here, these active samples were incubated with 2,2,2,-trifluoroethanol (TFE), a product analog that serves as a readily visualized active-site probe. Interactions of TFE with the Cu site were observed by both pulsed ENDOR spectroscopy and cryoEM, implicating Cu and the surrounding hydrophobic pocket as the likely site of methane oxidation. Use of these orthogonal techniques on parallel samples is a powerful approach that can circumvent difficulties in interpreting metalloenzyme cryoEM maps.