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首页> 美国卫生研究院文献>PLoS Clinical Trials >Bioenergetic Strategy for the Biodegradation of p-Cresol by the Unicellular Green Alga Scenedesmus obliquus
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Bioenergetic Strategy for the Biodegradation of p-Cresol by the Unicellular Green Alga Scenedesmus obliquus

机译：单细胞绿藻斜生生物降解对甲酚的生物能策略

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摘要

Cultures from the unicellular green alga Scenedesmus obliquus biodegrade the toxic p-cresol (4-methylphenol) and use it as alternative carbon/energy source. The biodegradation procedure of p-cresol seems to be a two-step process. HPLC analyses indicate that the split of the methyl group (first step) that is possibly converted to methanol (increased methanol concentration in the growth medium), leading, according to our previous work, to changes in the molecular structure and function of the photosynthetic apparatus and therefore to microalgal biomass increase. The second step is the fission of the intermediately produced phenol. A higher p-cresol concentration results in a higher p-cresol biodegradation rate and a lower total p-cresol biodegradability. The first biodegradation step seems to be the most decisive for the effectiveness of the process, because methanol offers energy for the further biodegradation reactions. The absence of LHCII from the Scenedesmus mutant wt-lhc stopped the methanol effect and significantly reduced the p-cresol biodegradation (only 9%). The present contribution deals with an energy distribution between microalgal growth and p-cresol biodegradation, activated by p-cresol concentration. The simultaneous biomass increase with the detoxification of a toxic phenolic compound (p-cresol) could be a significant biotechnological aspect for further applications.
机译：单细胞绿藻斜Scene藻的培养物可降解有毒的对甲酚（4-甲基苯酚），并将其用作替代碳/能源。对甲酚的生物降解过程似乎是一个两步过程。 HPLC分析表明，甲基的分裂（第一步）很可能转化为甲醇（生长培养基中的甲醇浓度增加），根据我们之前的工作，导致光合装置的分子结构和功能发生了变化从而使微藻生物量增加。第二步是裂解中间产生的苯酚。对甲酚浓度越高，对甲酚的生物降解率越高，对甲酚的总生物降解性越低。第一步生物降解似乎对工艺的有效性至关重要，因为甲醇为进一步的生物降解反应提供了能量。来自Scenedesmus突变体wt-lhc的LHCII的缺乏停止了甲醇作用，并显着降低了对甲酚的生物降解（仅9％）。本贡献涉及由对甲酚浓度激活的微藻类生长与对甲酚生物降解之间的能量分布。随着有毒酚类化合物（对甲酚）的解毒，生物量的同时增加可能是进一步应用的重要生物技术方面。

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