1d80: Difference between revisions

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[[Image:1d80.gif|left|200px]]
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[[Image:1d80.png|left|200px]]


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{{STRUCTURE_1d80|  PDB=1d80  |  SCENE=  }}  
{{STRUCTURE_1d80|  PDB=1d80  |  SCENE=  }}  


'''CRYSTAL STRUCTURE OF AN OLIGONUCLEOTIDE DUPLEX CONTAINING G.G BASE-PAIRS: THE INFLUENCE OF MISPAIRING ON DNA BACKBONE CONFORMATION'''
===CRYSTAL STRUCTURE OF AN OLIGONUCLEOTIDE DUPLEX CONTAINING G.G BASE-PAIRS: THE INFLUENCE OF MISPAIRING ON DNA BACKBONE CONFORMATION===




==Overview==
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The structure of the G.G mispaired dodecanucleotide d(CGCGAATTGGCG)2 has been solved by x-ray crystallography and refined to an R factor of 18.8% at 2.2 A resolution for 3513 reflections. The dodecamer crystallizes as a B-type DNA double helix. It contains two G(anti).G(syn) base pairs--i.e., G-4/G-16(anti).G-21/G-9(syn). The Hoogsteen base pairing involves atoms O-6 and N-7 of the guanine in the syn conformation with atoms N-1 and N-2 of the anti-paired purine. One G.G base pair has a bifurcated hydrogen bond between G-4(N-1)...G-21(N-7) and G-4(N-1)...G-21(O-6). There is little overall structural distortion of the double helix induced as a consequence of the mispairing. The helical width is significantly increased by comparison with the structure of the native duplex, and the minor groove width in the 5'-AATT region is decreased. The G.G base pairing induces high-BII phosphate conformations at residues G-9 and T-20 in addition to more normal BII conformations at G-10 and G-22. It is suggested that these backbone aberrations provide signals for the facile repairability of G.G mispairs in DNA.
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{{ABSTRACT_PUBMED_8430089}}


==About this Structure==
==About this Structure==
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[[Category: Double helix]]
[[Category: Double helix]]
[[Category: Mismatched]]
[[Category: Mismatched]]
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Fri May  2 13:33:11 2008''
 
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Jun 30 22:39:08 2008''

Revision as of 19:39, 30 June 2008

File:1d80.png

Template:STRUCTURE 1d80

CRYSTAL STRUCTURE OF AN OLIGONUCLEOTIDE DUPLEX CONTAINING G.G BASE-PAIRS: THE INFLUENCE OF MISPAIRING ON DNA BACKBONE CONFORMATION

Template:ABSTRACT PUBMED 8430089

About this Structure

Full crystallographic information is available from OCA.

Reference

Crystal structure of an oligonucleotide duplex containing G.G base pairs: influence of mispairing on DNA backbone conformation., Skelly JV, Edwards KJ, Jenkins TC, Neidle S, Proc Natl Acad Sci U S A. 1993 Feb 1;90(3):804-8. PMID:8430089

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