Isolation of a multiheme protein with features of a hydrazine-oxidizing enzyme from an anearobic ammonium-oxidizing enrichment culture

A multiheme protein having hydrazine-oxidizing activity was purified from enriched culture from a reactor in which an anammox bacterium, strain KSU-1 was dominant is described. The findings suggest that purified enzyme might be a novel hydrazine-oxidizing enzyme having a critical role in anaerobic ammonium oxidation.