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• W1948027265 abstract "The beta-ketoadipate pathway of Acinetobacter calcoaceticus comprises two parallel metabolic branches. One branch, mediated by six enzymes encoded by the cat genes, converts catechol to succinate and acetyl coenzyme A (acetyl-CoA); the other branch, catalyzed by products of the pca genes, converts protocatechuate to succinate and acetyl-CoA by six metabolic reactions analogous or identical to those of the catechol sequence. We used the expression plasmid pUC18 to construct expression libraries of DNA from an A. calcoaceticus mutant strain from which the cat genes had been deleted. Immunological screening with antiserum to the pcaE gene product, beta-ketoadipate:succinyl-CoA transferase I, resulted in the isolation of a cloned 11-kilobase-pair (kbp) fragment which inducibly expressed all six pca genes under control of the lac promoter on pUC18. The induced Escherichia coli cells formed the six pca gene products at levels 10- to 30-fold higher than found in fully induced A. calcoaceticus cultures, although protocatechuate 3,4-dioxygenase (the iron-containing product of the pcaA gene) from the recombinant strain possessed a relatively low turnover number. An E. coli culture expressing the cloned pca genes quantitatively converted protocatechuate to beta-ketoadipate; failure of the organism to metabolize the latter compound can be most readily ascribed to relatively low pool levels of succinyl-CoA, a required substrate for beta-ketoadipate:succinyl-CoA transferase, in E. coli. The gene order and direction of transcription were determined to be pcACBDFE by identification of enzymes expressed in subclones, by using natural transformation to identify subclones carrying DNA corresponding to dysfunctional alleles in mutant A. calcoaceticus strains, and by restriction mapping of both the 11-kbp fragment and derivatives of the 11-kbp fragment containing Tn5 in the pcaA, pcaB, pcaD, and pcaE genes. The fragment containing the pca gene hybridized strongly and specifically to a previously cloned fragment containing A. calcoaceticus cat genes." @default.
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• W1948027265 date "1987-07-01" @default.
• W1948027265 modified "2023-10-16" @default.
• W1948027265 title "Cloning and genetic organization of the pca gene cluster from Acinetobacter calcoaceticus" @default.
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• W1948027265 doi "https://doi.org/10.1128/jb.169.7.3168-3174.1987" @default.
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