Bifunctional electrophiles are capable of reacting with duplexed DNA to form inter- and intrachain crosslinks. Crosslinks involving the exocyclic amino groups of guanines and possibly of other bases will be studied. The tethers will include 4-carbon, three carbon and two carbon examples. Four types of studies will be undertaken. First, the structures of crosslinks formed by bifunctional agents will be elucidated. Compounds chosen for these studies include important environmental and endogenous mutagens for which crosslinks have already been demonstrated or that have the potential to form crosslinks. These bifunctional compounds include (1) four- atom tethers: a monocrotaline and 2,3-dihydro-5-(3',4'-dichlorophenyl)-6,7-bis) acetoxymethyl-1H-pyrrolizine bis(isopropylcarbamate) (i.e., IPP), (2) three-atom tethers: malondialdehyde, acrolein, and crotonaldehyde and (3) two-atom tethers 1-chlorooxirane, chloroacetaldehyde, and glyoxal. The second goal will involve synthesis of oligodeoxynucleotide duplexes containing structurally defined two-, three-, and four-atom interchain tethers. In addition, interchain tethers will be prepared with monocrotaline and IPP. The third goal involves investigations of repair of a vector containing single interchain crosslinks at defined sites. The studies will be carried out in human cells that are proficient and deficient in excision repair. These studies will involve collaboration with Dr. L. J. Marnett. The final goal involves structural studies of DNA containing the same crosslinks. Two-dimensional NMR will be used to establish duplex structure; gel mobility studies will be used to define bending or other global distortions. The NMR studies will be carried out in collaboration with Dr. M. P. Stone. It is expected that this integrated approach to the study of crosslinks will significantly improve our understanding of the structures and biological processing of crosslink lesions.

Agency
National Institute of Health (NIH)
Institute
National Institute of Environmental Health Sciences (NIEHS)
Type
Research Project (R01)
Project #
5R01ES007781-03
Application #
2770763
Study Section
Special Emphasis Panel (ZRG3-BNP (02))
Project Start
1996-09-01
Project End
2000-08-31
Budget Start
1998-09-01
Budget End
1999-08-31
Support Year
3
Fiscal Year
1998
Total Cost
Indirect Cost
Name
Vanderbilt University Medical Center
Department
Chemistry
Type
Schools of Arts and Sciences
DUNS #
004413456
City
Nashville
State
TN
Country
United States
Zip Code
37212
Dooley, Patricia A; Zhang, Mingzhou; Korbel, Gregory A et al. (2003) NMR determination of the conformation of a trimethylene interstrand cross-link in an oligodeoxynucleotide duplex containing a 5'-d(GpC) motif. J Am Chem Soc 125:62-72
Kowalczyk, Agnieszka; Carmical, J Russ; Zou, Yue et al. (2002) Intrastrand DNA cross-links as tools for studying DNA replication and repair: two-, three-, and four-carbon tethers between the N(2) positions of adjacent guanines. Biochemistry 41:3109-18
Dooley, P A; Tsarouhtsis, D; Korbel, G A et al. (2001) Structural studies of an oligodeoxynucleotide containing a trimethylene interstrand cross-link in a 5'-(CpG) motif: model of a malondialdehyde cross-link. J Am Chem Soc 123:1730-9
VanderVeen, L A; Hashim, M F; Nechev, L V et al. (2001) Evaluation of the mutagenic potential of the principal DNA adduct of acrolein. J Biol Chem 276:9066-70
Rodriguez, D A; Kowalczyk, A; Ward Jr, J B et al. (2001) Point mutations induced by 1,2-epoxy-3-butene N1 deoxyinosine adducts. Environ Mol Mutagen 38:292-6
Nechev, L V; Zhang, M; Tsarouhtsis, D et al. (2001) Synthesis and characterization of nucleosides and oligonucleotides bearing adducts of butadiene epoxides on adenine n(6) and guanine n(2). Chem Res Toxicol 14:379-88
Nechev, L V; Kozekov, I; Harris, C M et al. (2001) Stereospecific synthesis of oligonucleotides containing crotonaldehyde adducts of deoxyguanosine. Chem Res Toxicol 14:1506-12
Kowalczyk, A; Harris, C M; Harris, T M (2001) Synthesis and characterization of oligodeoxynucleotides containing an N1 beta-hydroxyalkyl adduct of 2'-deoxyinosine. Chem Res Toxicol 14:746-53
Kozekov, I D; Nechev, L V; Sanchez, A et al. (2001) Interchain cross-linking of DNA mediated by the principal adduct of acrolein. Chem Res Toxicol 14:1482-5
Nechev, L V; Harris, C M; Harris, T M (2000) Synthesis of nucleosides and oligonucleotides containing adducts of acrolein and vinyl chloride. Chem Res Toxicol 13:421-9

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