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Phage Tl and BU-Τ1 (phage DNA substituted with 5-bromouracil) were inactivated by UV-light (2537 A). After irradiation DNA was extracted and its sedimentation behaviour studied by zone centrifugation in neutral and alkaline sucrose gradients, respectively. In the DNA of unsubstituted phage no double-strand breaks and only a small number of single-strand breaks per inactivation dose could be detected after high UV-doses. However, after irradiation of phage BU-T1 double- and single-strand breaks were observed at an increased rate. UV-irradiation in the presence of a radical scavenger (0.01 M cysteamine) prevented the occurrence of double- but not of single strand breaks. The relevance of these breaks attributable to BU-incorporation for the biological activity (plaque forming ability) of the phage and the site of action of cysteamine are discussed.

UV-induzierte Brüche in 5-Bromuracil-substituierter DNS des Phagen T1 / UV-Induced Strand Breaks in 5-Bromouracil Substituted DNA of Phage T1