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EC Number	Crystallization (Commentary)
1.13.11.75	enzyme contains an Fe2+-4-His arrangement at the axis of a seven-bladed beta-propeller chain fold covered by a dome formed by six large loops. The Fe2+ is accessible through a long nonpolar tunnel that holds a carotenoid derivative in one of the crystals. On binding, three consecutive double bonds of this carotenoid change from a straight all-trans to a cranked cis-trans-cis conformation. The remaining trans bond is located at the dioxygen-ligated Fe2+ and cleaved by oxygen
1.13.11.75	hanging drop vapor diffusion method, using 0.1 mM Bis-tris propane-HCl, pH 6.0, 18-22% (w/v) sodium polyacrylate 2100, and 0.2 M NaCl
1.13.11.75	native enzyme in the absence of apocarotenoid substrate, hanging drop vapor diffusion method, mixing of 0.001 ml of 10 mg/ml protein in 25 mM HEPES-NaOH, pH 7.0, 1 mM dithiothreitol, and 0.8% w/v hexaethylene glycol monooctyl ether or 0.02% w/v Triton X-100, with 0.001 ml of reservoir solution containing 0.1 M BTP-HCl, pH 6.0, 2223% w/v PEG 3350, 0.2 M NH4Cl, and 1 mM MnCl2, 8°C, 3-4 days, X-ray diffraction structure determination and analysis. ACO crystallization strongly inhibits the apocarotenoid oxygenase activity of the enzyme
1.13.11.75	three-dimensional structure analysis

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Release 2023.1 (January 2023)