A temperate phage of Streptomyces azureus.

A new phage, SAt1, was isolated from soil on Streptomyces azureus ATCC 14921. This phage was able to lysogenize S. azureus. The percentage of lysogenic responses was ca. 10%. Electron microscopic observation showed that this phage belonged to group B of Bradley's morphological classification. The molecular mass of SAt1 DNA was ca. 24 megadaltons. The guanine-plus-cytosine content and the density of SAt1 DNA were ca. 71% and 1.724 g/cm3, respectively. A cleavage map of SAt1 DNA was constructed with restriction endonucleases BanIII, BglII, HindIII, and XbaI. Furthermore, some other characteristics of this phage were investigated.