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Nucleic Acids Research, 1991, Vol. 19, No. 6 1311-1316
© 1991

MOLECULAR BIOLOGY

Nearest neighbor effects on carcinogen binding to guanine runs in DNA

Boctor Said and Ronald C. Shank*

Environmental Toxicology Program, Department of Community and Environmental Medicine University of California Irvine, CA 92717, USA

* To whom correspondence should be addressed

Received September 25, 1990. Revised February 20, 1991. Accepted February 20, 1991.

A synthetic DNA fragment was constructed to determine the effect of 5' and 3' neighbors of guanlne runs on the binding of chemical carcinogens. Determinations were made on the relative intensity of reactivity between aflatoxin B1 or benzo(a)pyrene and methyinitrosourea or 1-(2-chloroethyl)-3-cyclohexyi-1-nitrosourea with various guanine positions in an endlabeled DNA fragment of known sequence. After reaction, the fragments were depurinated to produce strand breaks to allow Maxam and Gilbert sequencing for guanine positions. Relative reaction intensities were compared densltometricaliy. 3' nelghbors exerted greater influence on carclnogen binding than did 5' neighbors, the influence extended only to the adjacent guanine and depended upon the chemical nature of the carcinogen, in addition, the presence of one carcinogen adduct in the guanine run influenced the formation of a subsequent adduct when the DNA was exposed to a second carcinogen, and this effect also depended on the nature of the second carcinogen. The results suggest that DNA adduct formation in the presence of multiple carcinogens is more complicated than an additive mechanism would suggest.


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