Characterization of amoA and hao genes responsible for ammonia oxidation reaction in CANON system
In this research the genes (amoA and hao) for ammonia monooxygenase (AMO) and hydroxylamine oxidoreductase (HAO) responsible for ammonia oxidation reaction in completely autotrophic nitrogen removal over nitrite process were cloned and sequenced, and the recombinant protein of AMO and HAO was expressed and characterized. The optimum temperature for AMO activity was 55 ℃ and more than 40％ of the maximum activity was retained from 15-50 ℃. The optimum pH for the enzyme was found to be pH 11.0. The highest activity for HAO was observed at 45 ℃. More than 50％ of the maximum activity was retained even at 55 ℃. The dependence of HAO on pH was strong and only average 15％ of residual activity left at pH ranging from 3.0-9.0. Study on the molecular and biochemistry properties of recombinant AMO and HAO will benefit for the manipulation of ammonia-oxidizing bacteria to achieve the goal of high efficiency of nitrogen removal.
Zou Hanyan Huang Junli Fang Fang Guo Jinsong
Key Laboratory of Biorheological Science and Technology, Ministry of Education, Chongqing, China Key Laboratory of Three Gorges Reservoir Regions Eco-Environment, Ministry of Education, Chongqing
国际会议
哈尔滨
英文
1014-1019
2011-03-26（万方平台首次上网日期，不代表论文的发表时间）