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. 1996 Oct;62(10):3594–3599. doi: 10.1128/aem.62.10.3594-3599.1996

The effect of nutrient limitation on styrene metabolism in Pseudomonas putida CA-3.

K O'Connor 1, W Duetz 1, B Wind 1, A D Dobson 1
PMCID: PMC168165  PMID: 8967774

Abstract

Styrene degradation in Pseudomonas putida CA-3 has previously been shown to be subject to catabolite repression in batch culture. We report here on the catabolite-repressing effects of succinate and glutamate and the effects of a limiting inorganic-nutrient concentration on the styrene degradation pathway of P. putida CA-3 in a chemostat culture at low growth rates (0.05 h-1). Oxidation of styrene and the presence of styrene oxide isomerase and phenylacetaldehyde dehydrogenase activities were used as a measure of the expression of the styrene degradation pathway. Both glutamate and succinate failed to repress the styrene degradation ability under growth conditions of carbon and energy limitation. Lower levels of enzyme activities of the styrene degradation pathway were seen in cells grown on styrene or phenylacetic acid (PAA) under conditions of both ammonia and sulfate limitation than were seen under carbon and energy limitation. Cells grown on PAA under continuous culture oxidize styrene and styrene oxide and possess styrene oxide isomerase and NAD(+)-dependent phenylacetaldehyde dehydrogenase activities. Catabolite repression of styrene metabolism was observed in cells grown on styrene or PAA in the presence of growth-saturating (nonlimiting) concentrations of succinate or glutamate under sulfate limitation.

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Selected References

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