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[Nah-genes of Pseudomonas putida: molecular genetic analysis of the plasmid pBS286].

The hybridization and restriction analysis of the plasmid pBS286 (73 Kb, the P-9 Inc group) as well as parental plasmids NPL-1, NPL-41 demonstrated that pBS286 plasmid (delta NPL-41::TnA) with the constitutive synthesis of naphthalene dioxygenase carried genes for naphthalene oxidation to salicylate and those participating in degradation of catechol. Restriction map of pBS286 using XhoI restriction endonuclease and that of the nah region using EcoRI, BamHI, SalI and XhoI were established. Structural peculiarities of nah genes from pBS286 are compared with previously described NAH7. Some nah genes were localized. An inverted DNA segment involved in nah gene regulation was shown to be closely linked to a proximal part of the nah1 operon or overlapped. Possible occurrence of a regulatory R locus in this region is suggested.