卤代芳香族化合物的化学结构与生物降解性。氯化粘康酸向马来酰乙酸的转化。
Chemical structure and biodegradability of halogenated aromatic compounds. Conversion of chlorinated muconic acids into maleoylacetic acid.
作者信息
Schmidt E, Knackmuss H J
出版信息
Biochem J. 1980 Oct 15;192(1):339-47. doi: 10.1042/bj1920339.
Abstract
- An enzyme for the cycloisomerization of 2- and 3-chloro-cis,cis-muconic acid was isolated from 3-chlorobenzoate-grown cells of Pseudomonas sp. B13. It was named muconate cycloisomerase II, because it could it clearly be differentiated by its Km and Vmax. values from an ordinary muconate cycloisomerase, which functioned in benzoate catabolism and exhibited low activity with the chlorinated substrates. 2-Chloro-cis,cis-muconic acid was converted into trans- and 3-chloro-cis,cis--muconic acid into cis-4-carboxymethylenebut-2-en-4-olide together with dehalogenation. 2. An enzyme was isolated from chlorobenzoate-grown cells, which converted the 4-carboxymethylenebut-2-en-4-olides into maleoylacetic acid.
摘要
- 从在3-氯苯甲酸中生长的假单胞菌属B13细胞中分离出一种可使2-氯和顺，顺-粘康酸发生环异构化的酶。它被命名为粘康酸环异构酶II，因为通过其米氏常数（Km）和最大反应速率（Vmax）值可以清楚地将其与普通的粘康酸环异构酶区分开来，普通的粘康酸环异构酶在苯甲酸分解代谢中起作用，对氯化底物的活性较低。2-氯-顺，顺-粘康酸被转化为反式，3-氯-顺，顺-粘康酸被转化为顺-4-羧甲基丁-2-烯-4-内酯并伴有脱卤反应。2. 从在氯苯甲酸中生长的细胞中分离出一种酶，该酶可将4-羧甲基丁-2-烯-4-内酯转化为马来酰乙酸。
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