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Methanosarcina acetivorans , considered a strict anaerobic archaeon, was cultured in the presence of 0.4–1% O 2  (atmospheric) for at least 6 months to generate air-adapted cells; further, the biochemical mechanisms developed to deal with O 2  were characterized. Methane production and protein content, as indicators of cell growth, did not change in air-adapted cells respect to cells cultured under anoxia (control cells). In contrast, growth and methane production significantly decreased in control cells exposed for the first time to O 2 . Production of reactive oxygen species was 50 times lower in air-adapted cells  versus  control cells, suggesting enhanced anti-oxidant mechanisms that attenuated the O 2  toxicity. In this regard, (i) the transcripts and activities of superoxide dismutase, catalase and peroxidase significantly increased; and (ii) the thiol-molecules (cysteine + coenzyme M-SH + sulfide) and polyphosphate contents were respectively 2 and 5 times higher in air-adapted cells  versus  anaerobic-control cells. Long-term cultures (18 days) of air-adapted cells exposed to 2% O 2  exhibited the ability to form biofilms. These data indicate that  M. acetivorans  develops multiple mechanisms to contend with O 2  and the associated oxidative stress, as also suggested by genome analyses for some methanogens.

Air-Adapted Methanosarcina acetivorans Shows High Methane Production and Develops Resistance against Oxygen Stress