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Activated bleomycin is the drug species seen to be kinetically competent to initiate DNA degradation in the reaction of bleomycin, Fe(II), and O2. It also forms in reactions of bleomycin with Fe(III) and peroxide, or bleomycin with superoxide and either Fe(III) or Fe(II). Efforts to characterize this transient species proceeded by kinetic and spectroscopic strategies. Activated bleomycin now appears...
Superoxide and its products, especially hydroxyl radical, were recently proposed to be instrumental in cell death following treatment with a wide range of antimicrobials. Surprisingly, bleomycin lethality to Escherichia coli was ameliorated by a genetic deficiency of superoxide dismutase or by furnishing the superoxide generator plumbagin. Rescue by plumbagin was similar in strains containing or lacking...
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