Synthesis of diazirinyl organo-platinum complexes, which specifically interact with purine base, characterization of photoreactivity and interaction between guanosine 5'-monophosphate (GMP) were examined. The results indicated that the diazirinyl organo-platinum complex was useful for manipulations of photoaffinity labeled components.

Chemical carcinogens are generally activated enzymatically to electrophiles that form covalently bound carcinogen-DNA adducts. Detoxifying enzymes are competing with the activating enzymes for these procarcinogenic chemical substrates. Wide person-to-person variations in these two types of enzymatic activities are found. Repair rates of DNA damage caused by carcinogens also vary among individua...

Exceedingly sensitive assays are required for the detection of DNA adducts formed in humans exposed to low levels of environmental genotoxicants and therapeutic drugs. A 32P-postlabeling procedure for detection and quantitation of aromatic carcinogen-DNA lesions with a sensitivity limit of 1 adduct in 10(7) to 10(8) nucleotides has been described previously. In the standard procedure, DNA is en...