Abstract
To develop a screening procedure for the detection of restriction endonucleases in micromonosporae and catellatosporae based on efficiency of plating, eight different actinophages were isolated from soils enriched withMicromonospora species and one fromCatellatospora-enriched soil. The lytic actinophages all contained double-stranded DNA and the majority appeared, when examined by electron microscopy, to belong to Ackermann's type B1 since they had isometric heads and noncontractile tails. One actinophage was classified as type C1 because of its isometric head and very short noncontractile tail. The host ranges of the actinophages were determined on strains ofMicromonospora and selected species from other actinomycete genera of cell wall chemotype II. Type II restriction enzymes were isolated fromM. echinospora ssp.echinospora (ATCC 15837),M. purpurea (ATCC 15835) andM. zionensis (LL-100-125) and were designatedMecI,MpuI andMziI, respectively. Restriction enzymesMecI andMpuI are isoschizomers ofXhoI, whileMziI is an isoschizomer ofPvuII.
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