Toluene dioxygenase-catalysed cis-dihydroxylations of substituted aniline and phenol substrates, with a Pseudomonas putida UV4 mutant strain and an Escherichia coli pCL-4t recombinant strain, yielded identical arene cis-dihydrodiols, which were isolated as the preferred cyclohex-2-en-1-one cis-diol tautomers. These cis-diol metabolites were predicted by preliminary molecular docking studies, of anilines and phenols, at the active site of toluene dioxygenase. Further biotransformations of cyclohex-2-en-1-one cis-diol and hydroquinone metabolites, using Pseudomonas putida UV4 whole cells, were found to yield 4-hydroxycyclohex-2-en-1-ones as a new type of phenol bioproduct. Multistep pathways, involving ene reductase- and carbonyl reductase-catalysed reactions, were proposed to account for the production of 4-hydroxycyclohex-2-en-1-one metabolites. Evidence for the phenol hydrate tautomers of 4-hydroxycyclohex-2-en-1-one metabolites was shown by formation of the corresponding trimethylsilyl ether derivatives.

中文翻译：

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取代苯酚，苯胺和衍生的4-羟基环己-2-烯-1-酮的酶催化合成Cyclohex-2-en-1-one顺式二醇

甲苯双加氧酶催化的顺式取代的苯胺和苯酚基板-dihydroxylations，具有恶臭假单胞菌UV4突变菌株和大肠杆菌的pCL-4T重组菌株，得到相同的芳烃顺-dihydrodiols，其中分离作为优选环己-2-烯1-one顺式-二醇互变异构体。通过对苯胺和苯酚在甲苯双加氧酶活性位点的初步分子对接研究预测了这些顺式-二醇代谢物。使用恶臭假单胞菌对环己-2-烯-1-酮顺式二醇和对苯二酚代谢物进行进一步的生物转化发现UV4全细胞可产生4-羟基环己-2-烯-1-酮作为一种新型的苯酚生物产品。提出了涉及烯还原酶和羰基还原酶催化反应的多步途径，以解释4-羟基环己-2--2--1-酮代谢产物的产生。通过形成相应的三甲基甲硅烷基醚衍生物，显示了4-羟基环己-2-烯-1-酮代谢物的酚水合互变异构体的证据。