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amicyanin
Amicyanin is a type I copper protein that plays an integral role in electron transfer. In bacteria such as ''Paracoccus denitrificans'', amicyanin is part of a three-member redox complex, along with methylamine dehydrogenase (MADH) and cytochrome c-551i.
== Function ==
In the electron transfer mechanism from MADH to heme, amicyanin acts as an electron accepting intermediate. In this reaction, MADH catalyzes the oxidative deamination of methylamine to formaldehyde plus ammonia. The tryptophan tryptophylquinone (TTQ) group of MADH then donates electrons to the copper center of amicyanin, which in turn gives the electrons to the heme of the cytochrome c. In ''P. denitrificans'', amicyanin is absolutely required for electron transfer from MADH to c-type cytochromes. It has been shown that inactivation of amicyanin by gene replacement in vivo results in complete loss of ability to grow on methylamine.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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