The double-stranded (ds)DNAs of the three closely related temperate bacteriophages gd, ge and gf were studied biochemically and biophysically. The GC content of the DNA was 67.4 ± 0.5% and differed only slightly from that of the host . By electron microscopic length measurements a mol. wt. of 26.1 × 10 to 26.7 × 10 was calculated for the three bacteriophage DNAs. Homogeneity of the bacteriophage DNAs was further demonstrated by specific cleavage with restriction endonucleases RI and dIII. It was concluded that the three homo-immune bacteriophages are identical. The genome size of the host GA3 was 3.7 × 10 as calculated from optical renaturation rate measurements with reference DNA. The bacteriophage gd genome thus amounts to 0.7% of the chromosome of this bacterial host.


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