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Previous results indicate that a group of bacteriocins in Pseudomonas aeruginosa, named R-type pyocins, have a structure resembling bacteriophage tails and share some serological homology with certain bacteriophages. This paper presents genetic evidence which strongly suggests that components of pyocin R2, an R-type pyocin of P. aeruginosa PAO, and tail components of bacteriophage PS17 are interchangeable. Complementation tests with pyocin R2-deficient mutants of PAO and ts mutants of PS17 revealed that various phenotypic interactions occur between the pyocin and bacteriophage in PAO cells lysogenized or infected with PS17. (i) Certain pyocin R2-deficient mutations were phenotypically suppressed in cells carrying PS17 prophage. (ii) A temperature-sensitive mutant of PS17, tsQ31, was phenotypically suppressed in PAO cells treated with mitomycin C. (iii) Phenotypically mixed phages with receptor and serological specificities of pyocin R2 were formed in PS17 lysogens of certain pyocin R2-deficient mutants.

Phenotypic mixing of pyocin R2 and bacteriophage PS17 in Pseudomonas aeruginosa PAO