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- W1981322614 abstract "Quinoproteins may function either as oxidases or dehydrogenases, depending on the nature of their quinone prosthetic group. The tryptophan tryptophylquinone (TTQ)-linked methylamine dehydrogenase (MADH) is relatively inert towards O2 in its reduced form. It is shown that on exposure to long range UV (ultaviolet) light, MADH is oxidized in the presence of O2 and exhibits substrate-dependent steady-state oxidase activity. The effects of light are completely reversible, and oxidase activity is lost when the light is turned off. The light-dependent oxidation of MADH proceeds via a semiquinone intermediate which accumulates to near stoichiometric levels. The absorption of the light appears to provide energy to overcome a thermodynamic barrier to the transfer of an electron from TTQ to O2. These studies provide a basis for understanding what factors dictate whether an oxidoreductase is a dehydrogenase or an oxidase." @default.
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- W1981322614 date "1998-05-01" @default.
- W1981322614 modified "2023-10-16" @default.
- W1981322614 title "Methylamine dehydrogenase is a light-dependent oxidase" @default.
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- W1981322614 doi "https://doi.org/10.1016/s0005-2728(98)00035-8" @default.
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