When methane-eating microbes eat ammonia instead

Some microorganisms, the so-called methanotrophs, make a living by oxidizing methane (CH4) to carbon dioxide (CO2). Ammonia (NH3) is structurally very similar to methane, thus methanotrophs also co-metabolize ammonia and produce nitrite. While this process was observed in cell cultures, the underlying biochemical mechanism was not understood. Boran Kartal, head of the Microbial Physiology Group…