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NikD is an unusual amino-acid-oxidizing enzyme that contains covalently bound FAD, catalyzes a 4-electron oxidation of piperideine-2-carboxylic acid to picolinate, and plays a critical role in the biosynthesis of nikkomycin antibiotics. Crystal structures of closed and open forms of nikD, a two-domain enzyme, have been determined to resolutions of 1.15 and 1.9 Å, respectively. The two forms differ...
The type II quinohemoprotein alcohol dehydrogenase of Pseudomonas putida is a periplasmic enzyme that oxidizes substrate alcohols to the aldehyde and transfers electrons first to pyrroloquinoline quinone (PQQ) and then to an internal heme group. The 1.9 A resolution crystal structure reveals that the enzyme contains a large N-terminal eight-stranded β propeller domain (~60 kDa) similar to methanol...
Background: Monomeric sarcosine oxidases (MSOXs) are among the simplest members of a recently recognized family of eukaryotic and prokaryotic enzymes that catalyze similar oxidative reactions with various secondary or tertiary amino acids and contain covalently bound flavins. Other members of this family include heterotetrameric sarcosine oxidase, N-methyltryptophan oxidase and pipecolate oxidase...
Background: Copper-containing amine oxidases (CAOs) are widespread in nature. These enzymes oxidize primary amine substrates to the aldehyde product, reducing molecular oxygen to hydrogen peroxide in the process. CAOs contain one type 2 copper atom and topaquinone (TPQ), a modified tyrosine sidechain utilized as a redox cofactor. The methylamine oxidase from the yeast Hansenula polymorpha (HPAO) is...
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