[Plasmid participation in the degradation of alpha-methylstyrene].

Pseudomonas acidovorans 9 transforming alpha-methylstyrene into acetophenone contains four types of plasmid DNA with molecular masses of 130, 110, 36 and 54 MD. The loss of the "growth on alpha-methylstyrene" property by this strain correlates with the absence of plasmids with the molecular masses of 130 and 110 MD from the cells. All the types of plasmid DNA are found in transconjugants growing on alpha-methylstyrene and produced by crossing the parent P. acidovorans strain with the plasmidless variant of this strain incapable of alpha-methylstyrene transformation. Apparently, plasmids with the molecular masses of 130 and 110 MD participate in the genetic control of alpha-methylstyrene transformation into acetophenone by P. acidovorans 9.