Assimilation of methylamine by Paracoccus denitrificans involves formaldehyde transport by a specific carrier

Assimilation of methylamine by Paracoccus denitrificans involves the following enzymes: a periplasmic methylamine dehydrogenase, a formaldehyde transport system, cytoplasmic formaldehyde and formate dehydrogenase. Formaldehyde transport follows saturation kinetics with a high substrate affinity (Km = 7 microM), and is severely inhibited by iodoacetate, cyanide and p-trifluoromethoxy carbonylcyanide phenylhydrazone. Expression of the formaldehyde carrier is regulated by the carbon source.