Facile interstrand migration of the hydrocarbon moiety of a dibenzo[a,l]pyrene 11,12-diol 13,14-epoxide adduct at N2 of deoxyguanosine in a duplex oligonucleotide.

2.50
Hdl Handle:
http://hdl.handle.net/10146/28010
Title:
Facile interstrand migration of the hydrocarbon moiety of a dibenzo[a,l]pyrene 11,12-diol 13,14-epoxide adduct at N2 of deoxyguanosine in a duplex oligonucleotide.
Authors:
Wang, Ben; Sayer, Jane M.; Yagi, Haruhiko; Frank, Heinrich; Seidel, Albrecht; Jerina, Donald M.
Abstract:
When a synthesized deoxyribonucleotide duplex, 5'-CCATCGCTACC-3'.5'-GGTAGCGATGG-3', containing a trans 14R dibenzo[a,l]pyrene (DB[a,l]P) adduct, corresponding to trans opening of the (+)-(11S,12R)-diol (13R,14S)-epoxide by N (2) of the central G residue, was allowed to stand for 2-6 days at ambient temperature in neutral aqueous solution, three new products were observed on denaturing HPLC. One of these corresponded to loss of the DB[a,l]P moiety from the original adducted strand to give an 11-mer with an unmodified central dG. The other two products resulted from a highly unexpected migration of the hydrocarbon moiety to either dG5 or dG7 of the complementary strand, 5'-GGTAG5CG7ATGG-3'. Enzymatic hydrolysis of the two 11-mer migration products followed by CD spectroscopy of the isolated adducted nucleosides indicated that, in both cases, the hydrocarbon moiety had undergone configurational inversion at C14 to give the cis 14S DB[a,l]P dG adduct. MS/MS and partial enzymatic hydrolysis showed that the major 11-mer had the hydrocarbon at dG7. Two 11-mer oligonucleotides were synthesized with a single cis 14S DB[a,l]P dG adduct either at G7 or at G5 and were found to be chromatographically identical to the major and minor migration products, respectively. Although HPLC evidence suggested that a small extent of hydrocarbon migration from the trans 14S DB[a,l]P dG diastereomer also occurred, the very small amount of presumed migration products from this isomer precluded their detailed characterization. This interstrand migration appears unique to DB[a,l]P adducts and has not been observed for their fjord-region benzo[c]phenanthrene or bay-region benzo[a]pyrene analogues.
Citation:
J. Am. Chem. Soc. 2006, 128 (31):10079-10084
Journal:
Journal of the American Chemical Society
Issue Date:
9-Aug-2006
URI:
http://hdl.handle.net/10146/28010
DOI:
10.1021/ja0608038
PubMed ID:
16881636
Additional Links:
http://pubs.acs.org/cgi-bin/abstract.cgi/jacsat/2006/128/i31/abs/ja0608038.html
Type:
Article
Language:
en
ISSN:
0002-7863
Appears in Collections:
Articles

Full metadata record

DC FieldValue Language
dc.contributor.authorWang, Ben-
dc.contributor.authorSayer, Jane M.-
dc.contributor.authorYagi, Haruhiko-
dc.contributor.authorFrank, Heinrich-
dc.contributor.authorSeidel, Albrecht-
dc.contributor.authorJerina, Donald M.-
dc.date.accessioned2008-05-26T12:24:20Z-
dc.date.available2008-05-26T12:24:20Z-
dc.date.issued2006-08-09-
dc.identifier.citationJ. Am. Chem. Soc. 2006, 128 (31):10079-10084en
dc.identifier.issn0002-7863-
dc.identifier.pmid16881636-
dc.identifier.doi10.1021/ja0608038-
dc.identifier.urihttp://hdl.handle.net/10146/28010-
dc.description.abstractWhen a synthesized deoxyribonucleotide duplex, 5'-CCATCGCTACC-3'.5'-GGTAGCGATGG-3', containing a trans 14R dibenzo[a,l]pyrene (DB[a,l]P) adduct, corresponding to trans opening of the (+)-(11S,12R)-diol (13R,14S)-epoxide by N (2) of the central G residue, was allowed to stand for 2-6 days at ambient temperature in neutral aqueous solution, three new products were observed on denaturing HPLC. One of these corresponded to loss of the DB[a,l]P moiety from the original adducted strand to give an 11-mer with an unmodified central dG. The other two products resulted from a highly unexpected migration of the hydrocarbon moiety to either dG5 or dG7 of the complementary strand, 5'-GGTAG5CG7ATGG-3'. Enzymatic hydrolysis of the two 11-mer migration products followed by CD spectroscopy of the isolated adducted nucleosides indicated that, in both cases, the hydrocarbon moiety had undergone configurational inversion at C14 to give the cis 14S DB[a,l]P dG adduct. MS/MS and partial enzymatic hydrolysis showed that the major 11-mer had the hydrocarbon at dG7. Two 11-mer oligonucleotides were synthesized with a single cis 14S DB[a,l]P dG adduct either at G7 or at G5 and were found to be chromatographically identical to the major and minor migration products, respectively. Although HPLC evidence suggested that a small extent of hydrocarbon migration from the trans 14S DB[a,l]P dG diastereomer also occurred, the very small amount of presumed migration products from this isomer precluded their detailed characterization. This interstrand migration appears unique to DB[a,l]P adducts and has not been observed for their fjord-region benzo[c]phenanthrene or bay-region benzo[a]pyrene analogues.en
dc.language.isoenen
dc.relation.urlhttp://pubs.acs.org/cgi-bin/abstract.cgi/jacsat/2006/128/i31/abs/ja0608038.htmlen
dc.subject.meshBase Sequence-
dc.subject.meshBenzopyrenes-
dc.subject.meshChromatography, High Pressure Liquid-
dc.subject.meshDNA Adducts-
dc.subject.meshDeoxyguanosine-
dc.subject.meshEpoxy Compounds-
dc.subject.meshHydrocarbons-
dc.subject.meshSpectrophotometry, Ultraviolet-
dc.subject.meshTandem Mass Spectrometry-
dc.titleFacile interstrand migration of the hydrocarbon moiety of a dibenzo[a,l]pyrene 11,12-diol 13,14-epoxide adduct at N2 of deoxyguanosine in a duplex oligonucleotide.en
dc.typeArticleen
dc.identifier.journalJournal of the American Chemical Societyen

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