Catabolic plasmid specifying polychlorinated biphenyl degradation in Cupriavidus sp. strain SK-4: mobilization and expression in a pseudomonad.

Strain SK-4, a polychlorinated biphenyl (PCB) degrader previously reported to utilize di-ortho-substituted biphenyl, was genotypically re-characterized as a species of Cupriavidus. The bacterium harbored a single plasmid (pSK4), which resisted curing and which, after genetic marking by a transposon (SK4Tn5), could be mobilized into a pseudomonad. Analysis of pSK4 in both the transconjugant and the wild type revealed that it specifies the genes coding for 2-hydroxy-2,4-pentadienoate degradation in addition to those of the upper biphenyl pathway.