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. 1991 Aug;57(8):2179–2185. doi: 10.1128/aem.57.8.2179-2185.1991

Enhancement of the Potential To Utilize Octopine in the Nonfluorescent Pseudomonas sp. Strain 92

Santokh Singh Gill 1, Rodolphe Boivin 1,†, Patrice Dion 1,*
PMCID: PMC183547  PMID: 16348533

Abstract

The nonfluorescent Pseudomonas sp. strain 92 requires the presence of a supplementary carbon source for growth on octopine, whereas the spontaneous mutant RB100 has acquired the capacity to utilize this opine as the sole carbon and nitrogen source. Insertional mutagenesis of RB100 with transposon Tn5 generated mutants which were unable to grow on octopine and others which grew slowly on this substrate. Both types of mutants yielded revertants that had regained the ability to utilize octopine. Some of the revertants had lost the transposon, whereas in others the transposon was retained but with rearrangements of the insertion site. Genes of octopine catabolism from strain 92 were cloned on a cosmid vector to generate pK3. The clone pK3 conferred the ability to utilize octopine as the sole carbon and nitrogen source on the host Pseudomonas putida KT2440. Although they conferred an equivalent growth phenotype, the mutant genes carried by RB100 and the cloned genes on pK3 differed in their regulation. Utilization of [14C]octopine was inducible by octopine in RB100 and was constitutive in KT2440(pK3).

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Selected References

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