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Various mutants (lip) of Pseudomonas aeruginosa PAO 2302 that lacked extracellular lipase activity were isolated. They were selected on a calcium-triolein agar. The phenotypic characteristics of two of these mutants suggested that they were defective in the gene coding for lipase: both lip mutants produced no lipase in liquid- and on solid medium. They were nonpleiotropic with regard to various other exoproducts. None of the mutants released any putatively cell-bound lipase after treatment of cells with Triton X-100 or alginate. The electrophoretic protein- and LPS-profiles of outer membranes derived from lip mutants and the parental strain were identical. The lip locus was mapped on the chromosome of P. aeruginosa PAO 1 by FP5- and R68. 45-mediated crossings and by transduction with phage G101. The lip locus was cotransduced with pyrF only (60%) indicating a map position at about 57 min. The lipase gene was cloned on a 3.1 kb SalI fragment using vector pKT248. The newly constructed plasmid was able to complement the lipase deficiency of the two lip mutants of P. aeruginosa.

Chromosomal Mapping and Cloning of the Lipase Gene of Pseudomonas aeruginosa