Abstract
Five bacteriophages infecting only Saccharopolyspora erythraea (formerly Streptomyces erythreus) among 43 Streptomyces spp. tested were classified into two groups by phage-host relationships, restriction enzyme mapping, cohesive-end determinations, and Southern hybridizations. phi SE6, the most frequently isolated phage, produced clear plaques on all hosts tested, while phi SE45, phi SE57, phi SE60, and phi SE69 produced turbid plaques. phi SE6 DNA was linear, had a molecular weight of (27.6 +/- 1) X 10(6) and, like the DNAs of phi SE45, phi SE57, and phi SE69, lacked cohesive ends. The characteristic patterns of of ClaI and HindIII restriction digests of phi SE6 DNA and the results of Southern hybridizations with three different ClaI fragments of phi SE6 DNA as probes indicated that phi SE6 DNA was partially circularly permuted and terminally redundant, suggesting that it was packaged by a headful packaging mechanism. Southern hybridization data also showed that phi SE45, phi SE57, and phi SE69 were closely related to phi SE6. phi SE60 DNA, in contrast, had cohesive ends, and restriction mapping plus Southern hybridization data showed that phi SE60 was unrelated to the other four phages.
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