Benzo[a]pyrene diol epoxide adducts in DNA are potent suppressors of a normal topoisomerase I cleavage site and powerful inducers of other topoisomerase I cleavages.
Identifieur interne : 003631 ( Main/Curation ); précédent : 003630; suivant : 003632Benzo[a]pyrene diol epoxide adducts in DNA are potent suppressors of a normal topoisomerase I cleavage site and powerful inducers of other topoisomerase I cleavages.
Auteurs : Y. Pommier [États-Unis] ; G. Kohlhagen ; P. Pourquier ; J M Sayer ; H. Kroth ; D M JerinaSource :
- Proceedings of the National Academy of Sciences of the United States of America [ 0027-8424 ] ; 2000.
Descripteurs français
- KwdFr :
- MESH :
English descriptors
- KwdEn :
- MESH :
- chemical , metabolism : DNA Topoisomerases, Type I, Recombinant Fusion Proteins.
- chemical : 7,8-Dihydro-7,8-dihydroxybenzo(a)pyrene 9,10-oxide, DNA Adducts.
- Animals, Binding Sites, CHO Cells, Cricetinae, Humans, Recombination, Genetic.
Abstract
The catalytic intermediates of DNA topoisomerase I (top1) are cleavage complexes that can relax DNA supercoiling (intramolecular reaction) or mediate recombinations (intermolecular religation). We report here that DNA adducts formed from benzo[a]pyrene bay-region diol epoxides can markedly affect top1 activity. Four oligonucleotide 22-mers of the same sequence were synthesized, each of which contained a stereoisomerically unique benzo[a]pyrene 7, 8-diol 9,10-epoxide adduct at the 2-amino group of a central 2'-deoxyguanosine residue. These four adducts correspond to either cis or trans opening at C-10 of the (+)-(7R, 8S, 9S, 10R)- or (-)-(7S, 8R, 9R, 10S)-7,8-diol 9,10-epoxides. Their solution conformations in duplex DNA (intercalated and minor-groove bound for the cis and trans opened adducts respectively) can be deduced from previous NMR studies. All four adducts completely suppress top1 cleavage activity at the alkylation site and induce the formation of new top1cleavage complexes on both strands of the DNA 3-6 bases away from the alkylation site. The trans opened adduct from the highly carcinogenic (+)-diol epoxide is the most active in inducing top1 cleavage independently of camptothecin, demonstrating that minor groove alkylation can efficiently poison top1. We also found that this isomer of the diol epoxide induces the formation of top1-DNA complexes in mammalian cells, which suggests a possible relationship between induction of top1 cleavage complexes and carcinogenic activity of benzo[a]pyrene diol epoxides.
DOI: 10.1073/pnas.040397497
PubMed: 10688881
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<term>Binding Sites</term>
<term>CHO Cells</term>
<term>Cricetinae</term>
<term>DNA Adducts</term>
<term>DNA Topoisomerases, Type I (metabolism)</term>
<term>Humans</term>
<term>Recombinant Fusion Proteins (metabolism)</term>
<term>Recombination, Genetic</term>
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<term>ADN topoisomérases de type I (métabolisme)</term>
<term>Adduits à l'ADN</term>
<term>Animaux</term>
<term>Cellules CHO</term>
<term>Cricetinae</term>
<term>Humains</term>
<term>Protéines de fusion recombinantes (métabolisme)</term>
<term>Recombinaison génétique</term>
<term>Sites de fixation</term>
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<term>Recombinant Fusion Proteins</term>
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<term>DNA Adducts</term>
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<term>Protéines de fusion recombinantes</term>
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<term>Adduits à l'ADN</term>
<term>Animaux</term>
<term>Cellules CHO</term>
<term>Cricetinae</term>
<term>Humains</term>
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<front><div type="abstract" xml:lang="en">The catalytic intermediates of DNA topoisomerase I (top1) are cleavage complexes that can relax DNA supercoiling (intramolecular reaction) or mediate recombinations (intermolecular religation). We report here that DNA adducts formed from benzo[a]pyrene bay-region diol epoxides can markedly affect top1 activity. Four oligonucleotide 22-mers of the same sequence were synthesized, each of which contained a stereoisomerically unique benzo[a]pyrene 7, 8-diol 9,10-epoxide adduct at the 2-amino group of a central 2'-deoxyguanosine residue. These four adducts correspond to either cis or trans opening at C-10 of the (+)-(7R, 8S, 9S, 10R)- or (-)-(7S, 8R, 9R, 10S)-7,8-diol 9,10-epoxides. Their solution conformations in duplex DNA (intercalated and minor-groove bound for the cis and trans opened adducts respectively) can be deduced from previous NMR studies. All four adducts completely suppress top1 cleavage activity at the alkylation site and induce the formation of new top1cleavage complexes on both strands of the DNA 3-6 bases away from the alkylation site. The trans opened adduct from the highly carcinogenic (+)-diol epoxide is the most active in inducing top1 cleavage independently of camptothecin, demonstrating that minor groove alkylation can efficiently poison top1. We also found that this isomer of the diol epoxide induces the formation of top1-DNA complexes in mammalian cells, which suggests a possible relationship between induction of top1 cleavage complexes and carcinogenic activity of benzo[a]pyrene diol epoxides.</div>
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