A Penicillium oxalicum strain was capable of the phosphate-sensitive utilization of phosphonoacetic acid as the sole source of phosphorus. A carbon-to-phosphorus bond-cleavage enzyme yielding acetic acid and inorganic phosphate was detected and characterized in extracts from cells grown on this phosphonate. Contrary to bacterial phosphonoacetate hydrolases, the fungal enzyme neither required nor was stimulated by divalent cations.
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