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Most strains of Pseudomonas aeruginosa produce various types of bacteriocins (pyocins), namely, R-, F-, and S-type pyocins. The production of all types of pyocins was shown to be regulated by positive (prtN) and negative (prtR) regulatory genes. The prtN gene activates the expression of various pyocin genes, probably by the interaction of its product with the DNA sequences conserved in the 5' noncoding regions of the pyocin genes. The prtR gene represses the expression of the prtN gene, and its product, predicted from the nucleotide sequence, has a structure characteristic of phage repressors and seems to be inactivated by the RecA protein activated by DNA damage. A model for the regulation of the pyocin genes is proposed.

Regulation of pyocin genes in Pseudomonas aeruginosa by positive (prtN) and negative (prtR) regulatory genes