They comprise the type I methanotrophs, in contrast to the Methylocystaceae or type II methanotrophs. They belong among the gamma subdivision of the Proteobacteria, and are typically given their own order.
The Methylococcaceae have internal membranes in the form of flattened discs, perpendicular to the cell wall. Methane is oxidized to give formaldehyde, which is fixed by a process called the ribulose monophosphate (RuMP) cycle. Here formaldehyde is combined with sugar ribulose, producing hexulose. This, in turn, is broken down to produce glyceraldehyde, which is used to produce new ribulose and other organic compounds. Catabolism does not involve a complete citric acid cycle.
Some species of the Methylococcaceae have formed with certain marine mussels endosymbiotic relationships.
|This Gammaproteobacteria-related article is a stub. You can help Wikipedia by expanding it.|