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首页> 外文期刊>Environmental toxicology and chemistry >Metabolite production in degradation of pyrene alone or in a mixture with another polycyclic aromatic hydrocarbon by Mycobacterium sp.
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Metabolite production in degradation of pyrene alone or in a mixture with another polycyclic aromatic hydrocarbon by Mycobacterium sp.

机译：分枝杆菌单独降解or或与另一种多环芳烃混合降解degradation的代谢产物。

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摘要

Degradation of pyrene (PYR) alone and in the presence of phenanthrene or fluoranthene by Mycobacterium sp. strain A1-PYR isolated from mangrove sediments was investigated. When PYR was the only polycyclic aromatic hydrocarbon compound and the sole carbon source, only 33% of the added PYR was slowly degraded during 7 d of incubation. Seven metabolites were obtained, including four-ring metabolites (monohydroxypyrene and three different dihydroxypyrenes) and three-ring metabolites (dihydroxyphenanthrene, 4-phenanthrene-carboxylic acid, and 4-phenanthrol), of which more four-ring metabolites accumulated compared with three-ring metabolites. To our knowledge, this is the first report in which PYR was initially attacked by Mycobacterium sp. to form three different dihydroxypyrenes. Pyrene degradation was significantly stimulated when mixed with phenanthrene or fluoranthene. In the presence of fluoranthene, PYR was rapidly degraded (up to 57%), and significant amounts of dihydroxypyrene were formed within 3 d of incubation, followed by a period of minimal PYR degradation from 3 to 7 d with disappearance of four-ring metabolites and accumulation of three-ring metabolites. In contrast, PYR was removed completely, and little evidence of metabolites was detected in the presence of phenanthrene. These results showed that PYR was degraded to a larger extent when mixed with another polycyclic aromatic hydrocarbon concomitant with a higher turnover of PYR metabolites. The induction of complex enzyme systems and increase in biomass possibly affected the transformation of PYR metabolites in the mixture with phenanthrene or fluoranthene.
机译：单独的sp和在菲或荧蒽存在下由分枝杆菌sp降解。（PYR）。研究了从红树林沉积物中分离出的A1-PYR菌株。当PYR是唯一的多环芳烃化合物和唯一的碳源时，在孵育7天期间，仅33％的添加的PYR会缓慢降解。获得了7种代谢物，包括四环代谢物（单羟基py和三种不同的二羟基py）和三环代谢物（二羟基菲，4-菲-羧酸和4-邻苯二酚），与三环代谢物相比，四环代谢物的积累更多。环代谢产物。据我们所知，这是第一份有关PYR最初被分枝杆菌（Mycobacterium sp。）攻击的报告。形成三种不同的二羟基py当与菲或荧蒽混合时，degradation的降解受到明显的刺激。在荧蒽存在下，PYR迅速降解（高达57％），在孵育3 d内形成大量的二羟基followed，随后在3到7 d内PYR降解最小，并且四环代谢物消失和三环代谢物的积累。相反，PYR被完全去除，在菲存在下几乎没有发现代谢产物的证据。这些结果表明，当与另一种多环芳烃混合使用时，PYR的降解程度更大，PYR代谢产物的转化率更高。复杂酶系统的诱导和生物量的增加可能影响与菲或荧蒽的混合物中PYR代谢物的转化。

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