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    • 1. 发明授权
    • Levodione reductase
    • 左旋去氧还原酶
    • US06465228B1
    • 2002-10-15
    • US09495523
    • 2000-01-31
    • Shigeru NakamoriSakayu ShimizuMasaru Wada
    • Shigeru NakamoriSakayu ShimizuMasaru Wada
    • C12N902
    • C12N9/0008C12P7/26C12P41/002
    • A levodione reductase having the following physical properties is provided: molecular weight: from about 142,000 to about 155,000±10,000 (consisting of four homologous subunits having a molecular weight of 36,000±5,000); co-factor: nicotinamide adenine dinucleotide (AND/NADH); substrate specificity: active on levodione; optimum temperature: about 15° C. to about 20° C. at pH 7.0; optimum pH: 7.5; and activator: K+, Cs+, Rb+, Na+ and NH4+. The levodione reductase according to the present invention produces actinol, an important intermediate for the production of zeaxanthin, from levodione. This enzyme may be produced from a microorganism belonging to the genus Corynebacterium, preferably the microorganism Corynebacterium aquaticum AKU 611 (FERM BP-6448) or a functional equivalent, subculture, mutant or variant thereof. Also provided is a process for producing the levodione reductase that includes cultivating a microorganism of the genus Corynebacterium in an aqueous medium under aerobic conditions, disrupting the cells of the microorganism and isolating and purifying the levodione reductase from the cell-free extract. A process for producing actinol from levodione is also provided that includes contacting levodione with levodione reductase in the presence of the reduced form of nicotinamide adenine dinucleotide or a cell-free extract of the microorganism, and then isolating the resulting actinol from the reaction mixture.
    • 提供了具有以下物理性质的左旋二酮还原酶:分子量:约142,000至约155,000±10,000(由分子量为36,000±5,000的四个同源亚基组成); 辅因子:烟酰胺腺嘌呤二核苷酸(AND / NADH); 底物特异性:对左旋多巴有活性; 最适温度:约15℃至约20℃,pH 7.0; 最适pH:7.5; 和活化剂:K +,Cs +,Rb +,Na +和NH4 +。 根据本发明的左氧多糖还原酶从左旋二酮生产作为玉米黄质生产的重要中间体的肌动蛋白。 该酶可以由属于棒状杆菌属的微生物,优选微生物棒状杆菌属水杨酸AKU 611(FERM BP-6448)或其功能等同的传代培养,突变体或变体产生。 还提供了生产左旋体还原酶的方法,其包括在需氧条件下在水性介质中培养棒状杆菌属的微生物,破坏微生物的细胞并从无细胞提取物中分离和纯化左旋体还原酶。 还提供了用于从左旋二酮生产锕系元素的方法,包括在还原形式的烟酰胺腺嘌呤二核苷酸或微生物的无细胞提取物的存在下将左旋多糖与左旋二酮还原酶接触,然后从反应混合物中分离得到的锕系元素。