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| {{STRUCTURE_1d75| PDB=1d75 | SCENE= }} | | {{STRUCTURE_1d75| PDB=1d75 | SCENE= }} |
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| '''CONFORMATION OF THE GUANINE.8-OXOADENINE BASE PAIRS IN THE CRYSTAL STRUCTURE OF D(CGCGAATT(O8A)GCG)'''
| | ===CONFORMATION OF THE GUANINE.8-OXOADENINE BASE PAIRS IN THE CRYSTAL STRUCTURE OF D(CGCGAATT(O8A)GCG)=== |
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| ==Overview==
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| The structure of the synthetic deoxydodecamer d(CGCGAATT(O8A)GCG)2 (O8A = 8-oxoadenine) has been determined by single-crystal X-ray diffraction techniques. The oligonucleotide crystallizes in the orthorhombic space group P2(1)2(1)2(1) with cell dimensions of a = 25.48 A, b = 41.84 A, and c = 64.91 A. The refinement has converged with an R-factor of 0.151 for 1119 reflections in the resolution range 8.0-2.25 A. Sixty-seven solvent molecules were located during the course of the refinement. The B-DNA helix consists of ten Watson-Crick base pairs and two guanine-8-oxoadenine (G.O8A) base pairs. In order to achieve hydrogen-bonding complementarity between the two bases, an unusual G(anti).O8A-(syn) wobble conformation is adopted. It is proposed that the G.O8A mispairs are held together by a network of four interbase hydrogen bonds which are the result of the formation of two reverse three-center hydrogen-bonding systems. These involve one carbonyl oxygen lone pair interacting with two hydrogen atoms. In a departure from previous observations of the characteristics of purine-purine anti-syn base pairs, lambda 1 and lambda 2, the angles between the glycosidic bonds and the C1'-C1' vector, are symmetric. A reassessment of the other purine-purine mispairs suggests that similar three-center hydrogen bonds may occur and make a contribution to stabilizing other base pairings.
| | The line below this paragraph, {{ABSTRACT_PUBMED_1390625}}, adds the Publication Abstract to the page |
| | (as it appears on PubMed at http://www.pubmed.gov), where 1390625 is the PubMed ID number. |
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| | {{ABSTRACT_PUBMED_1390625}} |
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| ==About this Structure== | | ==About this Structure== |
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| [[Category: Mismatched]] | | [[Category: Mismatched]] |
| [[Category: Modified]] | | [[Category: Modified]] |
| ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Fri May 2 13:31:19 2008'' | | |
| | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Jun 30 22:34:32 2008'' |