|
|
| Line 1: |
Line 1: |
| [[Image:1b60.gif|left|200px]] | | {{Seed}} |
| | [[Image:1b60.png|left|200px]] |
|
| |
|
| <!-- | | <!-- |
| Line 9: |
Line 10: |
| {{STRUCTURE_1b60| PDB=1b60 | SCENE= }} | | {{STRUCTURE_1b60| PDB=1b60 | SCENE= }} |
|
| |
|
| '''3,N4-ETHENO-2'-DEOXYCYTIDINE OPPOSITE CYTIDINE IN AN 11-MER DUPLEX, SOLUTION STRUCTURE FROM NMR AND MOLECULAR DYNAMICS'''
| | ===3,N4-ETHENO-2'-DEOXYCYTIDINE OPPOSITE CYTIDINE IN AN 11-MER DUPLEX, SOLUTION STRUCTURE FROM NMR AND MOLECULAR DYNAMICS=== |
|
| |
|
|
| |
|
| ==Overview==
| | <!-- |
| Lipid peroxidation products, as well as the metabolic products of vinyl chloride, react with cellular DNA producing the mutagenic adduct 3,N(4)-etheno-2'-deoxycytidine (epsilondC), along with several other exocyclic derivatives. High-resolution NMR spectroscopy and restrained molecular dynamics simulations were used to establish the solution structure of an 11-mer duplex containing an epsilondC.dC base-pair at its center. The NMR data suggested a regular right-handed helical structure having all residues in the anti orientation around the glycosydic torsion angle and Watson-Crick alignments for all canonical base-pairs of the duplex. Restrained molecular dynamics generated a three-dimensional model in excellent agreement with the spectroscopic data. The (epsilondC. dC)-duplex structure is a regular right-handed helix with a slight bend at the lesion site and no severe distortions of the sugar-phosphate backbone. The epsilondC adduct and its partner dC were displaced towards opposite grooves of the helix, resulting in a lesion-containing base-pair that was highly sheared but stabilized to some degree by the formation of a single hydrogen bond. Such a sheared base-pair alignment at the lesion site was previously observed for epsilondC.dG and epsilondC.T duplexes, and was also present in the crystal structures of duplexes containing dG.T and dG. U mismatches. These observations suggest the existence of a substrate structural motif that may be recognized by specific DNA glycosylases during the process of base excision repair.
| | The line below this paragraph, {{ABSTRACT_PUBMED_10677286}}, adds the Publication Abstract to the page |
| | (as it appears on PubMed at http://www.pubmed.gov), where 10677286 is the PubMed ID number. |
| | --> |
| | {{ABSTRACT_PUBMED_10677286}} |
|
| |
|
| ==About this Structure== | | ==About this Structure== |
| Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1B60 OCA]. | | Full experimental information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1B60 OCA]. |
|
| |
|
| ==Reference== | | ==Reference== |
| Line 26: |
Line 30: |
| [[Category: Ethenodc]] | | [[Category: Ethenodc]] |
| [[Category: Exocyclic lesion]] | | [[Category: Exocyclic lesion]] |
| ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Fri May 2 11:06:52 2008'' | | |
| | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Jun 30 18:20:53 2008'' |
