Physical mapping of Streptomyces coelicolor A3(2) actinophage DNA. II. Transposon-like structure in DNA molecules of phiC43 phage DNA, localization of region responsible for establishment of the lysogenic state

Structural properties of DNA molecules of phages phi C43, phi C43del and mutant phage phi C311yg33 were studied. Actinophages phi C43del and phi C311yg33 have been isolated and shown to have a phenotype characteristic of phages defective in integration, i. e. turbid plaques and inability to establish the lysogenic state. By means of heteroduplexing, deletions were mapped in the genomes of these phages. DNA molecules of phi C43del and phi C11yg33 are devoid of the common fragment, which suggests that the mutant phenotypic character is associated with structural alterations in DNA molecules. The presence of transposon-like structure in phi C43 DNA molecules has been inferred from the analysis of phi C43/phi C43del heteroduplexes and phi C43 homoduplexes. Also, a deletion in phi C43 genome has been detected covering the same region where deletions in phi C43del and phi C11yg33 DNAs were located.