Synthesis of actinomycin-insensitive RNA during the first post-irradiation mitotic cycle, in the synchronously mitotic plasmodia ofPhysarum polycephalum

摘要

A sucrose density gradient analysis of3H-uridine pulse-labelled RNA from the first postirradiation mitotic cycle ofPhysarum polycephalumshows that all the density classes of RNA synthesized during this period are resistant to the peptide-antibiotic, actinomycin D. In fact, the synthesis is found to be greater in the presence of the drug. The heterogenously sedimenting synthetic activity here may represent a single species of RNA and its precursors or more than one kind of RNA. Further characterization of this RNA is meaningful in view of the actinomycin insensitivity of the postirradiation mitotic cycle itself to this antibiotic.