Pseudomonas putida utilized methyl parathion as sole carbon and (or) phosphorus source. The bacterium elaborated the enzyme organophosphorus acid anhydrase, which hydrolyzed methyl parathion to p-nitrophenol. p-Nitrophenol was further degraded to hydroquinone and 1, 2, 4-benzenetriol. The final ring compound, 1, 2, 4-benzenetriol, was cleaved by benzenetriol oxygenase to maleyl acetate.
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Rani et al. (1994) studied this question.