Genetic Foundations of Direct Ammonia Oxidation (Dirammox) to N 2 and MocR-Like Transcriptional Regulator DnfR in Alcaligenes faecalis Strain JQ135

Microbial ammonia oxidation is a key and rate-limiting step of the nitrogen cycle. Three previously known ammonia oxidation pathways (i.e., nitrification, anaerobic ammonia oxidation [Anammox], and complete ammonia oxidation [Comammox]) are mediated by autotrophic microbes.