Abstract
Cell-free extracts from phaseolotoxin-producing strains of Pseudomonas syringae pv. phaseolicola grown at 18 degrees C, the optimum temperature for phaseolotoxin production, contain an ornithine carbamoyltransferase activity that is insensitive to phaseolotoxin. Extracts from the same strains grown at 30 degrees C, a temperature at which little or no detectable phaseolotoxin is produced, and from phaseolotoxin-nonproducing strains contain a phaseolotoxin-sensitive ornithine carbamoyltransferase activity. The phaseolotoxin-insensitive ornithine carbamoyltransferase activity is also less senstive to N delta-(phosphonacetyl)-L-ornithine than the phaseolotoxin-sensitive ornithine carbamoyltransferase activity of the corresponding strain.
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