对硝基苯酚降解菌P3的分离、降解特性及基因工程菌的构建

分离到一株假单胞菌 (Pseudomonassp .)P3 ,该菌能够以对硝基苯酚为唯一碳源和氮源进行生长。在有外加氮源的条件下 ,P3降解对硝基苯酚并在培养液中积累亚硝酸根。P3有比较广泛的底物适应性 ,对多种芳香族化合物都有降解能力。不同金属离子对P3降解对硝基苯酚有不同的作用。葡萄糖的存在对P3降解对硝基苯酚无明显促进作用 ,而微量酵母粉可以大大促进P3对硝基苯酚的降解。以P3为受体菌 ,通过接合转移的手段将甲基对硫磷水解酶基因mpd克隆至P3菌中 ,获得了表达甲基对硫磷水解酶活性的基因工程菌PM ,PM能够以甲基对硫磷为唯一碳源进行生长。工程菌PM具有较高的甲基对硫磷降解活性及稳定性

Isolation and Characterization of A p-Nitrophenol Degradation Pseudomonas sp. Strain P3 and Construction of a Genetically Engineered Bacterium

A Pseudomonas strain P3 was isolated in this work. P3 can grow with p-nitrophenol as the sole carbon and nitrogen source. Growth in media with nitrogen, P3 can degrade p-nitrophenol to accumulate nitrite in the culture media. P3 can utilize a series of aromatic compounds as sole carbon sources. Different heavy metal ions have different effects on the degradation of p-Nitrophenol by P3. Glucose had no effect on the degradation of p-nitrophenol, while trace yeast extract greatly increased the degradation rate. Methyl parathion hydrolase gene mpd was clone into P3 by conjugation and genetically engineered bacterium PM was obtained. Methyl parathion hydrolase was expressed by PM. PM could grew on methyl parathion as sole carbon source. PM could degrade methyl parathion with relatively high activity and stability.