Isolation and characterization of a temperate bacteriophage from Streptomyces galilaeus

A new temperate actinophage from Streptomyces galilaeus ATCC 31133 was purified after that strain was crossed with S. peucetius ATCC 29050. Sensitive hosts became lysogenized and yielded turbid plaques of 2 to 3 mm in diameter. Host-range analysis indicated that 16 of 27 Streptomyces strains tested were sensitive to infection on solid medium. S. lividans and S. coelicolor A3(2) were among those not infected by this new actinophage. The new actinophage, designated phi SPK1, belongs to the Bradley group B morphological type, the pH optimum for infection is 6.75 to 7.0, it is not efficiently induced by mitomycin C or UV irradiation, it has a circular chromosome of 35.8 +/- 0.5 kilobase pairs in length containing overlapping (cohesive) ends, and the G+C content of its DNA was calculated from the buoyant density of 1.7240 to be 69 mol%. The DNA of phage phi SPK1 was cleaved by the restriction endonucleases ApaI, AluII, EcoRI, PvuII, and SalI, but, in all cases except that with EcoRI, treatment yielded greater than 20 restriction fragments. No sites were detected for BamHI, BclI, BglII, ClaI, HindIII, MluI, PstI, SmaI, SphI, SstI, XbaI, or XhoI.

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