Abstract
n-Hexadecane added as electron donor and carbon source to an anaerobic enrichment culture from an oil production plant or to anoxic marine sediment samples allowed dissimilatory sulfate reduction to sulfide. The enrichment from the oil field was purified via serial dilutions in liquid medium under a hexadecane phase and in agar medium with caprylate. A pure culture of a sulfate-reducing bacterium, strain Hxd3, with relatively tiny cells (0.4–0.5 by 0.8–2 μm) was isolated that grew anaerobically on hexadecane without addition of further organic substrates. Most of the cells were found to adhere to the hydrocarbon phase. It was verified that neither organic impurities in hexadecane nor residual oxygen were responsible for growth. Strain Hxd3 was grown with n-hexadecane of high purity (≥99.5%) in anoxic glass ampoules sealed by fusion. Of 0.4 ml hexadecane added per l (1.4 mmol per l), 90% was degraded with concomitant reduction of sulfate. Controls with pasteurized cells or a common Desulfovibrio species neither consumed hexadecane nor reduced sulfate. Incubation of cell-free medium with low reducing capacity and a redox indicator showed that the ampoules were completely oxygen-tight. Measured degradation balances and enzyme activities suggested a complete oxidation of the alkane to CO2 via the carbon monoxide dehydrogenase pathway. However, the first step in anaerobic alkane oxidation is unknown. On hexadecane, strain Hxd3 produced as much as 15 to 20 mM H2S, but growth was rather slow; with 5% inoculum, cultures were fully grown after 5 to 7 weeks. The new sulfate reducer grew on alkanes from C12 to C20, 1-hexadecene, 1-hexadecanol, 2-hexadecanol, palmitate and stearate. Best growth occurred on stearate (doubling time around 26 h). Growth on soluble fatty acids such as caprylate was very poor. Alkanes with chains shorter than C12, lactate, ethanol or H2 were not used. Strain Hxd3 is the first anaerobe shown to grow definitely on saturated hydrocarbons.
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Abbreviations
- CO dehydrogenase:
-
carbon monoxide dehydrogenase
- DTE:
-
1,4-dithioerythritol
- Tris:
-
tris(hydroxymethyl)-aminomethane
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Dedicated to Dr. Ralph S. Wolfe on occasion of his 70th birthday
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Aeckersberg, F., Bak, F. & Widdel, F. Anaerobic oxidation of saturated hydrocarbons to CO2 by a new type of sulfate-reducing bacterium. Arch. Microbiol. 156, 5–14 (1991). https://doi.org/10.1007/BF00418180
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DOI: https://doi.org/10.1007/BF00418180