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[[Image:331d.png|left|200px]]
==CRYSTAL STRUCTURE OF D(GCGCGCG) WITH 5'-OVERHANG G'S==
<StructureSection load='331d' size='340' side='right' caption='[[331d]], [[Resolution|resolution]] 1.65&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[331d]] is a 2 chain structure. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=331D OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=331D FirstGlance]. <br>
</td></tr><tr><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=NCO:COBALT+HEXAMMINE(III)'>NCO</scene><br>
<tr><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=331d FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=331d OCA], [http://www.rcsb.org/pdb/explore.do?structureId=331d RCSB], [http://www.ebi.ac.uk/pdbsum/331d PDBsum]</span></td></tr>
<table>
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
The crystal structure of the DNA heptamer d(GCGCGCG) has been solved at 1.65 A resolution by the molecular replacement method and refined to an R-value of 0.184 for 3598 reflections. The heptamer forms a Z-DNA d(CGCGCG)2 with 5'-overhang G residues instead of an A-DNA d(GCGCGC)2 with 3'-overhang G residues. The overhang G residues from parallel strands of two adjacent duplexes form a trans reverse Hoogsteen G x G basepair that stacks on the six Z-DNA basepairs to produce a pseudocontinuous helix. The reverse Hoogsteen G x G basepair is unusual in that the displacement of one G base relative to the other allows them to participate in a bifurcated (G1)N2 . . . N7(G8) and an enhanced (G8)C8-H . . . O6(G1) hydrogen bond, in addition to the two usual hydrogen bonds. The 5'-overhang G residues are anti and C2'-endo while the 3'-terminal G residues are syn and C2'-endo. The conformations of both G residues are different from the syn/C3'-endo for the guanosine in a standard Z-DNA. The two cobalt hexammine ions bind to the phosphate groups in both GpC and CpG steps in Z(I) and Z(II) conformations. The water structure motif is similar to the other Z-DNA structures.


{{STRUCTURE_331d|  PDB=331d  |  SCENE=  }}
Crystal structure of d(GCGCGCG) with 5'-overhang G residues.,Pan B, Ban C, Wahl MC, Sundaralingam M Biophys J. 1997 Sep;73(3):1553-61. PMID:9284322<ref>PMID:9284322</ref>


===CRYSTAL STRUCTURE OF D(GCGCGCG) WITH 5'-OVERHANG G'S===
From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
 
</div>
{{ABSTRACT_PUBMED_9284322}}
== References ==
 
<references/>
==About this Structure==
__TOC__
[[331d]] is a 2 chain structure. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=331D OCA].
</StructureSection>
 
==Reference==
<ref group="xtra">PMID:009284322</ref><references group="xtra"/>
[[Category: Ban, C.]]
[[Category: Ban, C.]]
[[Category: Pan, B.]]
[[Category: Pan, B.]]
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