Abstract

Carbazole 1,9a-dioxygenase (CARDO) catalyzes the dihydroxylation of carbazole by angular-position (C9a) carbon bonding to the imino nitrogen and its adjacent C1 carbon. CARDO consists of a terminal oxygenase component and two electron-transfer components: ferredoxin and ferredoxin reductase. The terminal oxygenase component (43.9 kDa) of carbazole 1,9a-dioxygenase from Nocardioides aromaticivorans IC177 was crystallized at 293 K using the hanging-drop vapour-diffusion method with PEG 8000 as the precipitant. The crystals diffract to 2.3 A resolution and belong to space group C2.

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