Purification and characterization of fenitrothion hydrolase from Burkholderia sp. NF100

The organophosphorus pesticide hydrolase was purified to homogeneity from Burkholderia sp. NF100 by detergent extraction of the cell membrane fraction, anion-exchange, chromatofocusing, and gel filtration chromatographies. The purified enzyme had a molecular mass of 55 kDa and a pI 5.8, and the hydrolase activity was strongly inhibited by EDTA, dithiothreitol (DTT), Hg2+ and 1,10-phenanthroline. The optimum pH and temperature for the enzyme activity were 8.0 and 40 degrees C, respectively. The enzyme hydrolyzed five organophosphorus pesticides.