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Bacterial dehalorespiration with chlorinated benzenes

机译：氯化苯对细菌的除汗作用

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摘要

Chlorobenzenes are toxic, highly persistent and ubiquitously distributed environmental contaminants that accumulate in the food chain. The only known microbial transformation of 1,2,3,5-tetrachlorobenzene (TeCB) and higher chlorinated benzenes is the reductive dechlorination to lower chlorinated benzenes under anaerobic conditions observed with mixed bacterial cultures. The lower chlorinated benzenes can subsequently be mineralized by aerobic bacteria. Here we describe the isolation of the oxygen-sensitive strain CBDB1, a pure culture capable of reductive dechlorination of chlorobenzenes. Strain CBDB1 is a highly specialized bacterium that stoichiometrically dechlorinates 1,2,3-trichlorobenzene (TCB), 1,2,4-TCB, 1,2,3,4-TeCB, 1,2,3,5-TeCB and 1,2,4,5-TeCB to dichlorobenzenes or 1,3,5-TCB. The presence of chlorobenzene as an electron acceptor and hydrogen as an electron donor is essential for growth, and indicates that strain CBDB1 meets its energy needs by a dehalorespiratory process. According to their 16S rRNA gene sequences, strain CBDB1, Dehalococcoides ethenogenes and several uncultivated bacteria form a new bacterial cluster, of which strain CBDB1 is the first, so far, to thrive on a purely synthetic medium.
机译：氯苯是有毒的，高度持久的，无处不在的环境污染物，它们会积聚在食物链中。 1,2,3,5-四氯苯（TeCB）和高级氯苯的唯一已知微生物转化是在混合细菌培养物中观察到的厌氧条件下还原脱氯为低级氯苯的过程。随后可通过需氧细菌将低级氯苯矿化。在这里，我们描述了对氧敏感的菌株CBDB1的分离，这是一种能够还原氯苯脱氯的纯培养物。菌株CBDB1是高度专业化的细菌，可以化学计量地将1,2,3-三氯苯（TCB），1,2,4-TCB，1,2,3,4-TeCB，1,2,3,5-TeCB和1脱氯，2,4,5-TeCB生成二氯苯或1,3,5-TCB。氯苯作为电子受体，氢作为电子供体的存在对于生长至关重要，这表明菌株CBDB1通过脱呼吸过程满足了其能量需求。根据它们的16S rRNA基因序列，菌株CBDB1，埃德汉球菌和几种未经培养的细菌形成了一个新的细菌簇，到目前为止，菌株CBDB1是第一个在纯合成培养基上繁殖的细菌。

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