Marked Differences in Base Selectivity between DNA and the Free Nucleotides upon Adduct Formation from Bay- and Fjord-Region Diol Epoxides
作者:SreenivasaRao Vepachedu、Naiqi Ya、Haruhiko Yagi、Jane M. Sayer、Donald M. Jerina
DOI:10.1021/tx000073w
日期:2000.9.1
85% dA adducts on reaction with DNA. With the BaP DEs, 60-77% of the exocyclic amino group adducts formed upon competitive reaction with the freenucleotides are derived from dGMP. The observed dG selectivity of these BaP DEs is much smaller with the nucleotide mixture than it is with DNA, leading to the conclusion that DNA structure has a much larger modifying effect on the baseselectivity of the
Covalent nucleoside adducts of benzo[a]pyrene 7,8-diol 9,10-epoxides: structural reinvestigation and characterization of a novel adenosine adduct on the ribose moiety
作者:Jane M. Sayer、Anju Chadha、Shiv K. Agarwal、Herman J. C. Yeh、Haruhiko Yagi、Donald M. Jerina
DOI:10.1021/jo00001a007
日期:1991.1
The diastereomeric 7,8-diol 9,10-epoxides metabolically derived from the carcinogenic hydrocarbon benzo[alpha]pyrene react with the purine bases in nucleic acids to alkylate their exocyclic amino groups. The major adducts formed from polyguanylic acid and the enantiomers of diol epoxide-1 (the diastereomer in which the benzylic 7-hydroxyl group and the epoxide oxygen are cis) have been shown to result from cis opening of the epoxide by the N-2 amino group of guanine, rather than trans opening as had been previously reported. Four adducts resulting from alkylation of the exocyclic N-6 amino group of adenosine 5'-monophosphate by racemic diol epoxide-1 have been prepared and characterized. In addition, a major adduct formed from adenosine 5'-monophosphate and (-)-(7R,8S)-diol (9R,10S)-epoxide-1, but not from its (+) enantiomer, has been identified as a product of alkylation of the 2'-hydroxyl group of the sugar. We also report a quantitative reevaluation of the extent and distribution of covalent adduct formation from calf thymus DNA and both diastereomeric benzo[alpha]pyrene diol epoxides, as well as the identification of the principal DNA adducts formed from the enantiomers of diol epoxide-1. Tentative identification of several new minor adducts formed upon reaction of diol epoxide-2 with denatured DNA is described. The present results provide additional support for our previously proposed correlation between the signs of the circular dichroism bands of these adducts and their absolute configurations at the N-substituted benzylic carbon atom.
SAYER, JANE M.;CHADHA, ANJU;AGARWAL, SHIV K.;YEH, HERMAN J. C.;YAGI, HARU+, J. ORG. CHEM., 56,(1991) N, C. 20-29
作者:SAYER, JANE M.、CHADHA, ANJU、AGARWAL, SHIV K.、YEH, HERMAN J. C.、YAGI, HARU+
DOI:——
日期:——
FU P. P.; HARREY R. G., TETRAHEDRON LETT. <TELE-AY>, 1977, NO 24, 2059-2062