Microsomal and cytosolic epoxide hydrolase in Drosophila melanogaster

Subcellular fractions from Drosophila melanogaster and rat liver were investigated on their epoxide hydrolase activity. Both microsomes and the post-microsomal supernatant of Drosophila appeared to contain epoxide hydrolase activity using styrene-7,8-oxide as the substrate. Based on body weight, these activities were in the same order of magnitude. Rat liver cytosol was able to catalyze the hydrolysis of styrene oxide only if the glutathione S-transferase activity was blocked.