Abstract
A modified cloning procedure was used to obtain large DNA insertions (20 to 30 kb) from Pseudomonas putida NCIB 9816 that expressed polycyclic aromatic hydrocarbon (PAH) transformation activity in Escherichia coli HB101. Four subclones (16 [in both orientations], 12, and 8.5 kb in size) were constructed from the initial clones. Naphthalene, fluorene, and phenanthrene transformations were investigated in these eight NCIB 9816 clones by a simple agar plate assay method, which was developed to detect and identify potential PAH metabolites. Results indicated that the necessary genes encoding the initial ring fission of the three PAHs in E. coli cells are located in an 8.5-kb EcoRI-XhoI portion, but the lower-pathway genes are not present in a 38-kb neighborhood region. These NCIB 9816 clones could transform naphthalene and phenanthrene to salicylic acid and 1-hydroxy-2-naphthoic acid, respectively. With the same clones, fluorene was degraded to 9-hydroxyfluorene, 9-fluorenone, and two unidentified compounds. Genetic similarity between the NAH7 upper-pathway genes and the cloned NCIB 9816 genes was confirmed by Southern blot DNA-DNA hybridization. In spite of this genetic similarity, the abilities of the two clusters to transform multiple PAHs were different. Under our experimental conditions, only the metabolites from naphthalene transformation by the NAH7 clone (pE317) were detected, whereas the NCIB 9816 clones produced metabolites from all three PAHs.
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