Nitrosomonas europaea is a chemolithotroph that obtains energy through the oxidation of ammonia to hydroxylamine while assimilates atmospheric CO to cover the cell carbon demands for growth. This microorganism plays a relevant role in the nitrogen biogeochemical cycle on Earth but its carbon metabolism remains poorly characterized. Based on sequence homology, we identified two genes (cbbG and gabD) coding for redox enzymes in N.
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