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Expression of the PAPI-1 pil genes. β-Galactosidase levels in P. aeruginosa strains PAO1 (open bars) and PA14 (filled bars) carrying promoter-lacZ fusions are shown. The putative promoters of the PAPI-1 pil operon (pilL2P) and the pilS2 gene (pilS2P) were fused to the reporter lacZ gene, and the expression of β-galactosidase was monitored in both PAO1, a strain lacking of the PAPI-1 island, and strain PA14. Error bars indicate standard deviations.
