Amine dehydrogenase

Amine Dehydrogenase, also known as Methylamine Dehydrogenase, is a TTQ-dependent enzyme that catalyzes the oxidative deamination of a primary amine to an aldehyde and ammonia. The reaction occurs as follows:

RCH2NH2 + H2O + acceptor → RCHO + NH3 + reduced acceptor

Amine Dehydrogenase possesses an α2β2 structure with each smaller β subunit possessing a TTQ prosthetic group.

Amine dehydrogenase, studied in Paracoccus denitrificans, at least transiently forms a ternary complex to catalyze methylamine-dependent cytochrome c-551i reduction. Within this complex, electrons are transferred from the TTQ cofactor of MADH to the Type 1 copper center of amicyanin, and then to the heme of the cytochrome.