Identification of Pseudomonas plasmids able to suppress the lysogeny-establishment-deficiency (Les-) phenotype.

A suppressor of the mutations which inhibit the establishment of lysogeny in Pseudomonas aeruginosa has been found to be encoded by P. aeruginosa plasmids of four separate incompatibility groups. The wide distribution of this phenotype (designated Sly for suppressor of lysogeny establishment deficiency) indicates that these plasmids are able to enhance or replace host functions involved in the stable establishment of extrachromosomal DNA.