A Common Host Specificity in the Restriction and Modification of a Bacteriophage by Three Distinct Streptomyces Species

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Abstract
Restriction/modification was identified in 3 spp. of Streptomyces: S. olivaceus, S. lipmanii and S. cattleya. The restriction/modification acted on 1 bacteriophage FF4. No mutational event was involved as the phenomenon was reversible. A possible explanation for the similarity between the restriction/modification systems of the 3 spp. would be a common extrachromosomal element coding for restriction/modification.