Position-specific trapping of topoisomerase I-DNA cleavage complexes by intercalated benzo[a]- pyrene diol epoxide adducts at the 6-amino group of adenine.
Identifieur interne : 003619 ( Main/Exploration ); précédent : 003618; suivant : 003620Position-specific trapping of topoisomerase I-DNA cleavage complexes by intercalated benzo[a]- pyrene diol epoxide adducts at the 6-amino group of adenine.
Auteurs : Y. Pommier [États-Unis] ; G S Laco ; G. Kohlhagen ; 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 :
- ADN (), ADN (métabolisme), ADN topoisomérases de type I (), ADN topoisomérases de type I (métabolisme), Adénine (), Adénine (métabolisme), Benzopyrènes (), Benzopyrènes (métabolisme), Composés époxy (), Composés époxy (métabolisme), Humains, Protéines recombinantes (), Protéines recombinantes (métabolisme), Relation structure-activité, Spécificité du substrat.
- MESH :
English descriptors
- KwdEn :
- Adenine (chemistry), Adenine (metabolism), Benzopyrenes (chemistry), Benzopyrenes (metabolism), DNA (chemistry), DNA (metabolism), DNA Topoisomerases, Type I (chemistry), DNA Topoisomerases, Type I (metabolism), Epoxy Compounds (chemistry), Epoxy Compounds (metabolism), Humans, Recombinant Proteins (chemistry), Recombinant Proteins (metabolism), Structure-Activity Relationship, Substrate Specificity.
- MESH :
- chemical , chemistry : Adenine, Benzopyrenes, DNA, DNA Topoisomerases, Type I, Epoxy Compounds, Recombinant Proteins.
- chemical , metabolism : Adenine, Benzopyrenes, DNA, DNA Topoisomerases, Type I, Epoxy Compounds, Recombinant Proteins.
- Humans, Structure-Activity Relationship, Substrate Specificity.
Abstract
DNA topoisomerase I (top1) is the target of potent anticancer agents, including camptothecins and DNA intercalators, which reversibly stabilize (trap) top1 catalytic intermediates (cleavage complexes). The aim of the present study was to define the structural relationship between the site(s) of covalently bound intercalating agents, whose solution conformations in DNA are known, and the site(s) of top1 cleavage. Two diastereomeric pairs of oligonucleotide 22-mers, derived from a sequence used to determine the crystal structure of top1-DNA complexes, were synthesized. One pair contained either a trans-opened 10R- or 10S-benzo[a]pyrene 7, 8-diol 9,10-epoxide adduct at the N(6)-amino group of a central 2'-deoxyadenosine residue in the scissile strand, and the other pair contained the same two adducts in the nonscissile strand. These adducts were derived from the (+)-(7R,8S,9S,10R)- and (-)-(7S,8R,9R, 10S)-7,8-diol 9,10-epoxides in which the benzylic 7-hydroxyl group and the epoxide oxygen are trans. On the basis of analogy with known solution conformations of duplex oligonucleotides containing these adducts, we conclude that top1 cleavage complexes are trapped when the hydrocarbon adduct is intercalated between the base pairs flanking a preexisting top1 cleavage site, or between the base pairs immediately downstream (3' relative to the scissile strand) from this site. We propose a model with the +1 base rotated out of the duplex, and in which the intercalated adduct prevents religation of the corresponding nucleotide at the 5' end of the cleaved DNA. These results suggest mechanisms whereby intercalating agents interfere with the normal function of human top1.
DOI: 10.1073/pnas.190312697
PubMed: 10995470
Affiliations:
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Le document en format XML
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Pommier</name><affiliation wicri:level="2"><nlm:affiliation>Laboratory of Molecular Pharmacology, Division of Basic Sciences, National Cancer Institute, National Institutes of Health, Bethesda, MD 20892, USA. pommier@nih.gov</nlm:affiliation><country xml:lang="fr">États-Unis</country><wicri:regionArea>Laboratory of Molecular Pharmacology, Division of Basic Sciences, National Cancer Institute, National Institutes of Health, Bethesda, MD 20892</wicri:regionArea><placeName><region type="state">Maryland</region></placeName></affiliation></author><author><name sortKey="Laco, G S" sort="Laco, G S" uniqKey="Laco G" first="G S" last="Laco">G S Laco</name></author><author><name sortKey="Kohlhagen, G" sort="Kohlhagen, G" uniqKey="Kohlhagen G" first="G" last="Kohlhagen">G. Kohlhagen</name></author><author><name sortKey="Sayer, J M" sort="Sayer, J M" uniqKey="Sayer J" first="J M" last="Sayer">J M Sayer</name></author><author><name sortKey="Kroth, H" sort="Kroth, H" uniqKey="Kroth H" first="H" last="Kroth">H. Kroth</name></author><author><name sortKey="Jerina, D M" sort="Jerina, D M" uniqKey="Jerina D" first="D M" last="Jerina">D M Jerina</name></author></analytic><series><title level="j">Proceedings of the National Academy of Sciences of the United States of America</title><idno type="ISSN">0027-8424</idno><imprint><date when="2000" type="published">2000</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Adenine (chemistry)</term><term>Adenine (metabolism)</term><term>Benzopyrenes (chemistry)</term><term>Benzopyrenes (metabolism)</term><term>DNA (chemistry)</term><term>DNA (metabolism)</term><term>DNA Topoisomerases, Type I (chemistry)</term><term>DNA Topoisomerases, Type I (metabolism)</term><term>Epoxy Compounds (chemistry)</term><term>Epoxy Compounds (metabolism)</term><term>Humans</term><term>Recombinant Proteins (chemistry)</term><term>Recombinant Proteins (metabolism)</term><term>Structure-Activity Relationship</term><term>Substrate Specificity</term></keywords><keywords scheme="KwdFr" xml:lang="fr"><term>ADN ()</term><term>ADN (métabolisme)</term><term>ADN topoisomérases de type I ()</term><term>ADN topoisomérases de type I (métabolisme)</term><term>Adénine ()</term><term>Adénine (métabolisme)</term><term>Benzopyrènes ()</term><term>Benzopyrènes (métabolisme)</term><term>Composés époxy ()</term><term>Composés époxy (métabolisme)</term><term>Humains</term><term>Protéines recombinantes ()</term><term>Protéines recombinantes (métabolisme)</term><term>Relation structure-activité</term><term>Spécificité du substrat</term></keywords><keywords scheme="MESH" type="chemical" qualifier="chemistry" xml:lang="en"><term>Adenine</term><term>Benzopyrenes</term><term>DNA</term><term>DNA Topoisomerases, Type I</term><term>Epoxy Compounds</term><term>Recombinant Proteins</term></keywords><keywords scheme="MESH" type="chemical" qualifier="metabolism" xml:lang="en"><term>Adenine</term><term>Benzopyrenes</term><term>DNA</term><term>DNA Topoisomerases, Type I</term><term>Epoxy Compounds</term><term>Recombinant Proteins</term></keywords><keywords scheme="MESH" qualifier="métabolisme" xml:lang="fr"><term>ADN</term><term>ADN topoisomérases de type I</term><term>Adénine</term><term>Benzopyrènes</term><term>Composés époxy</term><term>Protéines recombinantes</term></keywords><keywords scheme="MESH" xml:lang="en"><term>Humans</term><term>Structure-Activity Relationship</term><term>Substrate Specificity</term></keywords><keywords scheme="MESH" xml:lang="fr"><term>ADN</term><term>ADN topoisomérases de type I</term><term>Adénine</term><term>Benzopyrènes</term><term>Composés époxy</term><term>Humains</term><term>Protéines recombinantes</term><term>Relation structure-activité</term><term>Spécificité du substrat</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">DNA topoisomerase I (top1) is the target of potent anticancer agents, including camptothecins and DNA intercalators, which reversibly stabilize (trap) top1 catalytic intermediates (cleavage complexes). The aim of the present study was to define the structural relationship between the site(s) of covalently bound intercalating agents, whose solution conformations in DNA are known, and the site(s) of top1 cleavage. Two diastereomeric pairs of oligonucleotide 22-mers, derived from a sequence used to determine the crystal structure of top1-DNA complexes, were synthesized. One pair contained either a trans-opened 10R- or 10S-benzo[a]pyrene 7, 8-diol 9,10-epoxide adduct at the N(6)-amino group of a central 2'-deoxyadenosine residue in the scissile strand, and the other pair contained the same two adducts in the nonscissile strand. These adducts were derived from the (+)-(7R,8S,9S,10R)- and (-)-(7S,8R,9R, 10S)-7,8-diol 9,10-epoxides in which the benzylic 7-hydroxyl group and the epoxide oxygen are trans. On the basis of analogy with known solution conformations of duplex oligonucleotides containing these adducts, we conclude that top1 cleavage complexes are trapped when the hydrocarbon adduct is intercalated between the base pairs flanking a preexisting top1 cleavage site, or between the base pairs immediately downstream (3' relative to the scissile strand) from this site. We propose a model with the +1 base rotated out of the duplex, and in which the intercalated adduct prevents religation of the corresponding nucleotide at the 5' end of the cleaved DNA. These results suggest mechanisms whereby intercalating agents interfere with the normal function of human top1.</div></front></TEI><affiliations><list><country><li>États-Unis</li></country><region><li>Maryland</li></region></list><tree><noCountry><name sortKey="Jerina, D M" sort="Jerina, D M" uniqKey="Jerina D" first="D M" last="Jerina">D M Jerina</name><name sortKey="Kohlhagen, G" sort="Kohlhagen, G" uniqKey="Kohlhagen G" first="G" last="Kohlhagen">G. Kohlhagen</name><name sortKey="Kroth, H" sort="Kroth, H" uniqKey="Kroth H" first="H" last="Kroth">H. Kroth</name><name sortKey="Laco, G S" sort="Laco, G S" uniqKey="Laco G" first="G S" last="Laco">G S Laco</name><name sortKey="Sayer, J M" sort="Sayer, J M" uniqKey="Sayer J" first="J M" last="Sayer">J M Sayer</name></noCountry><country name="États-Unis"><region name="Maryland"><name sortKey="Pommier, Y" sort="Pommier, Y" uniqKey="Pommier Y" first="Y" last="Pommier">Y. 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