Family of membrane associated monooxygenases (EC 1.13.12.-) which utilise O(2) to oxidise their substrate. Family members include both ammonia and methane monooxygenases involved in the oxidation of their respective substrates. These enzymes are multi-subunit complexes. This family represents the B subunit of the enzyme; the A subunit is thought to contain the active site. [1,2].

1: Diversity of ammonia monooxygenase operon in autotrophic ammonia-oxidizing bacteria. Norton JM, Alzerreca JJ, Suwa Y, Klotz MG; Arch Microbiol 2002;177:139-149. PMID:11807563

2: Molecular analysis of the pmo (particulate methane monooxygenase) operons from two type II methanotrophs. Gilbert B, McDonald IR, Finch R, Stafford GP, Nielsen AK, Murrell JC; Appl Environ Microbiol 2000;66:966-975. PMID:10698759