The anammoxosome is a large intracytoplasmic compartment bounded by a single bilayer, ladderane-lipid-containing membrane present in bacteria that perform anaerobic ammonium oxidation (anammox). This organelle is the site of the anammox process, in which nitrite is used as the electron acceptor in the conversion of ammonium to dinitrogen (N2) gas and water. Anammox bacteria belong to the phylum Planctomycetes and are recognized as major players in the global nitrogen cycle.

› Cellular component