Abstract:f)-trans-dihydroxy-7,8-dihydrobenzo(a)pyrene and 9-hydroxybenzo(a)pyrene (9-OH-BP) were metabolized by rat liver microsomes in the presence of calf thymus DNA, resulting in preferential DNA binding of fluorescent (+)-anti-BP-7,8-diol-9,lO-epoxide (BPDE) and 9-OH-BP-4,5-epoxide, respectively. When the DNA is denatured the fluorescence intensities of the bound metabolites change in a characteristic manner. Fluorescence decay measurements show that the intensity changes are due to changes in lifetimes of the ex… Show more
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