Purity > 90% as determined by SDS-PAGE. MW: 71.1kDa. Full Length of Mature Protein: 58-553aa. N-terminal 6xHis-SUMO-tagged. Paracoccus denitrificans. Nitrous-oxide reductase is part of a bacterial respiratory system which is activated under anaerobic conditions in the presence of nitrate or nitrous oxide.