三氯乙烯的生物降解及芳香族生物降解途径的参与
Biodegradation of trichloroethylene and involvement of an aromatic biodegradative pathway.
作者信息
Nelson M J, Montgomery S O, Mahaffey W R, Pritchard P H
出版信息
Appl Environ Microbiol. 1987 May;53(5):949-54. doi: 10.1128/aem.53.5.949-954.1987.
Abstract
Biodegradation of trichloroethylene (TCE) by bacterial strain G4 resulted in complete dechlorination of the compound, as indicated by the production of inorganic chloride. A component of the water from which strain G4 was isolated that was required for TCE degradation was identified as phenol. Strain G4 degraded TCE in the presence of chloramphenicol only when preinduced with phenol. Toluene, o-cresol. and m-cresol could replace the phenol requirement. Two of the inducers of TCE metabolism, phenol and toluene, apparently induced the same aromatic degradative pathway that cleaved the aromatic ring by meta fission. Cells induced with either phenol or toluene had similar oxidation rates for several aromatic compounds and had similar levels of catechol-2,3-dioxygenase. The results indicate that one or more enzymes of an inducible pathway for aromatic degradation in strain G4 are responsible for the degradation of TCE.
摘要
细菌菌株G4对三氯乙烯（TCE）的生物降解导致该化合物完全脱氯，无机氯的产生表明了这一点。从其中分离出菌株G4的水样中，一种TCE降解所需的成分被鉴定为苯酚。只有在先用苯酚预诱导的情况下，菌株G4才能在氯霉素存在时降解TCE。甲苯、邻甲酚和间甲酚可以替代对苯酚的需求。TCE代谢的两种诱导剂，苯酚和甲苯，显然诱导了相同的芳香族降解途径，该途径通过间位裂解来切割芳香环。用苯酚或甲苯诱导的细胞对几种芳香族化合物具有相似的氧化速率，并且具有相似水平的儿茶酚-2,3-双加氧酶。结果表明，菌株G4中一种可诱导的芳香族降解途径的一种或多种酶负责TCE的降解。
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