Extracellular electron transfer-dependent anaerobic oxidation of ammonium by anammox bacteria.

ABSTRACT: Anaerobic ammonium oxidation (anammox) bacteria contribute significantly to the global nitrogen cycle and play a major role in sustainable wastewater treatment. Anammox bacteria convert ammonium (NH₄⁺) to dinitrogen gas (N₂) using intracellular electron acceptors such as nitrite (NO₂^-) or nitric oxide (NO). However, it is still unknown whether anammox bacteria have extracellular electron transfer (EET) capability with transfer of electrons to insoluble extracellular electron acceptors. Here we show that freshwater and marine anammox bacteria couple the oxidation of NH₄⁺ with transfer of electrons to insoluble extracellular electron acceptors such as graphene oxide or electrodes in microbial electrolysis cells.

SUBMITTER: Shaw DR 

PROVIDER: S-EPMC7188810 | biostudies-literature | 2020 Apr

REPOSITORIES: biostudies-literature