1b6x
From Proteopedia
(New page: 200px<br /><applet load="1b6x" size="450" color="white" frame="true" align="right" spinBox="true" caption="1b6x" /> '''3,N4-ETHENO-2'-DEOXYCYTIDINE OPPOSITE GUANIN...) |
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| - | [[Image:1b6x.gif|left|200px]]<br /><applet load="1b6x" size=" | + | [[Image:1b6x.gif|left|200px]]<br /><applet load="1b6x" size="350" color="white" frame="true" align="right" spinBox="true" |
caption="1b6x" /> | caption="1b6x" /> | ||
'''3,N4-ETHENO-2'-DEOXYCYTIDINE OPPOSITE GUANINE IN AN 11-MER DUPLEX, SOLUTION STRUCTURE FROM NMR AND MOLECULAR DYNAMICS, 4 STRUCTURES'''<br /> | '''3,N4-ETHENO-2'-DEOXYCYTIDINE OPPOSITE GUANINE IN AN 11-MER DUPLEX, SOLUTION STRUCTURE FROM NMR AND MOLECULAR DYNAMICS, 4 STRUCTURES'''<br /> | ||
==Overview== | ==Overview== | ||
| - | Vinyl chloride reacts with cellular DNA producing | + | Vinyl chloride reacts with cellular DNA producing 3,N4-etheno-2'-deoxycytidine (epsilonC) along with other exocyclic adducts. The solution structure of an oligodeoxynucleotide duplex containing an epsilonC.dG base pair was determined by high-resolution NMR spectroscopy and molecular dynamics simulations. NMR data indicated that the duplex adopts a right-handed helical structure having all residues in anti orientation around the glycosylic torsion angle. The epsilonC adduct has a sugar pucker in the C3'-endo/C4'-exo region while the rest of the residues are in the C2'-endo/C3'-exo range. NOE interactions established Watson-Crick alignments for canonical base pairs of the duplex. The imino proton of the lesion-containing base pair resonated as a sharp signal that was resistant to water exchange, suggesting hydrogen bonding. Restrained molecular dynamics simulations generated three-dimensional models in excellent agreement with the spectroscopic data. The refined structures are slightly bent at the lesion site without major perturbations of the sugar-phosphate backbone. The adduct is displaced and shifted toward the major groove of the helix while its partner on the complementary strand remains stacked. The epsilonC(anti).dG(anti) base pair alignment is sheared and stabilized by the formation of hydrogen bonds. The biological implications of structures of epsilonC-containing DNA duplexes are discussed. |
==About this Structure== | ==About this Structure== | ||
| - | 1B6X is a [http://en.wikipedia.org/wiki/Protein_complex Protein complex] structure of sequences from [http://en.wikipedia.org/wiki/ ]. Full crystallographic information is available from [http:// | + | 1B6X is a [http://en.wikipedia.org/wiki/Protein_complex Protein complex] structure of sequences from [http://en.wikipedia.org/wiki/ ]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1B6X OCA]. |
==Reference== | ==Reference== | ||
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[[Category: Cullinan, D.]] | [[Category: Cullinan, D.]] | ||
[[Category: Eisenberg, M.]] | [[Category: Eisenberg, M.]] | ||
| - | [[Category: Grollman, A | + | [[Category: Grollman, A P.]] |
[[Category: Johnson, F.]] | [[Category: Johnson, F.]] | ||
| - | [[Category: Santos, C | + | [[Category: Santos, C De Los.]] |
[[Category: deoxyribonucleic acid]] | [[Category: deoxyribonucleic acid]] | ||
[[Category: edc]] | [[Category: edc]] | ||
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[[Category: exocyclic lesion]] | [[Category: exocyclic lesion]] | ||
| - | ''Page seeded by [http:// | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Feb 21 11:52:10 2008'' |
Revision as of 09:52, 21 February 2008
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3,N4-ETHENO-2'-DEOXYCYTIDINE OPPOSITE GUANINE IN AN 11-MER DUPLEX, SOLUTION STRUCTURE FROM NMR AND MOLECULAR DYNAMICS, 4 STRUCTURES
Overview
Vinyl chloride reacts with cellular DNA producing 3,N4-etheno-2'-deoxycytidine (epsilonC) along with other exocyclic adducts. The solution structure of an oligodeoxynucleotide duplex containing an epsilonC.dG base pair was determined by high-resolution NMR spectroscopy and molecular dynamics simulations. NMR data indicated that the duplex adopts a right-handed helical structure having all residues in anti orientation around the glycosylic torsion angle. The epsilonC adduct has a sugar pucker in the C3'-endo/C4'-exo region while the rest of the residues are in the C2'-endo/C3'-exo range. NOE interactions established Watson-Crick alignments for canonical base pairs of the duplex. The imino proton of the lesion-containing base pair resonated as a sharp signal that was resistant to water exchange, suggesting hydrogen bonding. Restrained molecular dynamics simulations generated three-dimensional models in excellent agreement with the spectroscopic data. The refined structures are slightly bent at the lesion site without major perturbations of the sugar-phosphate backbone. The adduct is displaced and shifted toward the major groove of the helix while its partner on the complementary strand remains stacked. The epsilonC(anti).dG(anti) base pair alignment is sheared and stabilized by the formation of hydrogen bonds. The biological implications of structures of epsilonC-containing DNA duplexes are discussed.
About this Structure
1B6X is a Protein complex structure of sequences from [1]. Full crystallographic information is available from OCA.
Reference
Solution structure of a DNA duplex containing the exocyclic lesion 3,N4-etheno-2'-deoxycytidine opposite 2'-deoxyguanosine., Cullinan D, Johnson F, Grollman AP, Eisenberg M, de los Santos C, Biochemistry. 1997 Sep 30;36(39):11933-43. PMID:9305987
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