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The DNA of Pseudomonas aeruginosa rough-specific bacteriophage phi PLS27 was studied. The genome size as determined by summing the sizes of restriction fragments was 42.7 kilobase pairs. Of particular interest was the fact that the DNA was insensitive to certain common restriction endonucleases including EcoRI, BamHI, and HindIII. The ends of the phage DNA were cloned and sequenced, revealing direct repeats of 318 nucleotides. The left end of the genome when cloned into the promoter selection vector pKK232-8 exhibited promoter activity in Escherichia coli. Two promoters bearing greater than 70% sequence homology to the plasmid pNM74 TOL operon and PAK pilin promoters were identified.

Characterization of the genome of Pseudomonas aeruginosa bacteriophage phi PLS27 with particular reference to the ends of the DNA