Abstract
The 2.2 Å crystal structure of the 251K α2β2γ2 dimeric hydroxylase protein of methane mono-oxygenase from Methylococcus capsulatus (Bath) reveals the geometry of the catalytic di-iron core. The two iron atoms are bridged by exogenous hydroxide and acetate ligands and further coordinated by four glutamate residues, two histidine residues and a water molecule. The dinuclear iron centre lies in a hydrophobic active-site cavity for binding methane. An extended canyon runs between αβ pairs, which have many long α-helices, for possible docking of the reductase and coupling proteins required for catalysis.
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Rosenzweig, A., Frederick, C., Lippard, S. et al. Crystal structure of a bacterial non-haem iron hydroxylase that catalyses the biological oxidation of methane. Nature 366, 537–543 (1993). https://doi.org/10.1038/366537a0
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DOI: https://doi.org/10.1038/366537a0
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