Abstract
Soluble methane monooxygenase (sMMO) maximization studies were carried out as part of a larger effort directed towards the development and optimization of an aqueous phase, multistage, membrane bioreactor system for treatment of polluted groundwater. A modified version of the naphthalene oxidation assay was utilized to determine the effects of methane:oxygen ratio, nutrient supply, and supplementary carbon sources on maximizing and maintaining sMMO activity inMethylosinus trichosporium OB3b.Methylosinus trichosporium OB3b attained peak sMMO activity (275–300 nmol of naphthol formed h−1 mg of protein−1 at 25°C) in early stationary growth phase when grown in nitrate mineral salts (NMS) medium. With the onset of methane limitation however, sMMO activity rapidly declined. It was possible to define a simplified nitrate mineral salts (NMS) medium, containing nitrate, phosphate and a source of iron and magnesium, which allowed reasonably high growth rates (μmax 0.08 h−1) and growth yields (0.4–0.5 g cells/g CH4) and near maximal activities of sMMO. In long term batch culture incubations sMMO activity reached a stable plateau at approximately 45–50% of the initial peak level and this was maintained over several weeks. The addition of d-biotin, pyridoxine, and vitamin B12 (cyanocobalamin) increased the activity level of sMMO in actively growing methanotrophs by 25–75%. The addition of these growth factors to the simplified NMS medium was found to increase the plateau sMMO level in long term batch cultures up to 70% of the original peak activity.
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Abbreviations
- sMMO:
-
soluble methane monooxygenase
- pMMO:
-
particulate methane monooxygenase
- NMS:
-
nitrate mineral salts
- TCE:
-
trichloroethene
- NADH:
-
reduced nicotinamide adenine dinucleotide
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Bowman, J.P., Sayler, G.S. Optimization and maintenance of soluble methane monooxygenase activity inMethylosinus trichosporium OB3b. Biodegradation 5, 1–11 (1994). https://doi.org/10.1007/BF00695208
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DOI: https://doi.org/10.1007/BF00695208