Abstract
1. Digestive gland homogenates of the marine mussel, Mytilus edulis, were found to degrade the potent neurotoxins diisopropylfluorophosphate (DFP) and N, N'-diisopropylphosphorodiamidofluoridate (mipafox). 2. The DFP hydrolyzing activity was characterized at different temperatures, pHs, substrate concentrations, and in the presence of chelating agents. 3. Gel column chromatography revealed a molecular weight of 24–32,000 for the DFP hydrolyzing OPA anhydrase. A mipafox hydrolyzing activity with about the same molecular weight was also identified. However, it remained unclear if the DFP and mipafox hydrolysis was carried out by one or by two enzymes. 4. Similar to the results obtained for the clam, Rangia cuneata, the DFP hydrolyzing OPA anhydrase of M. edulis was not inhibited by mipafox and showed no stimulation by manganese ions. 5. These similarities suggest that the consideration of phylogenetic relationships could improve the existing OPA anhydrase classification.
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