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. 1985 Jun;162(3):865–871. doi: 10.1128/jb.162.3.865-871.1985

Cloning of genes specifying carbohydrate catabolism in Pseudomonas aeruginosa and Pseudomonas putida.

S M Cuskey, J A Wolff, P V Phibbs Jr, R H Olsen
PMCID: PMC215855  PMID: 3922954

Abstract

A 6.0-kilobase EcoRI fragment of the Pseudomonas aeruginosa PAO chromosome containing a cluster of genes specifying carbohydrate catabolism was cloned into the multicopy plasmid pRO1769. The vector contains a unique EcoRI site for cloning within a streptomycin resistance determinant and a selectable gene encoding gentamicin resistance. Mutants of P. aeruginosa PAO transformed with the chimeric plasmid pRO1816 regained the ability to grow on glucose, and the following deficiencies in enzyme or transport activities corresponding to the specific mutations were complemented: glcT1, glucose transport and periplasmic glucose-binding protein; glcK1, glucokinase; and edd-1, 6-phosphogluconate dehydratase. Two other carbohydrate catabolic markers that are cotransducible with glcT1 and edd-1 were not complemented by plasmid pRO1816: zwf-1, glucose-6-phosphate dehydrogenase; and eda-9001, 2-keto-3-deoxy-6-phosphogluconate aldolase. However, all five of these normally inducible activities were expressed at markedly elevated basal levels when transformed cells of prototrophic strain PAO1 were grown without carbohydrate inducer. Vector plasmid pRO1769 had no effect on the expression of these activities in transformed mutant or wild-type cells. Thus, the chromosomal insert in pRO1816 contains the edd and glcK structural genes, at least one gene (glcT) that is essential for expression of the glucose active transport system, and other loci that regulate the expression of the five clustered carbohydrate catabolic genes. The insert in pRO1816 also complemented the edd-1 mutation in a glucose-negative Pseudomonas putida mutant but not the eda-1 defect in another mutant. Moreover, pRO1816 caused the expression of high specific activities of glucokinase, an enzyme that is naturally lacking in these strains of Pseudomonas putida.

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Selected References

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