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[[Image:1v3n.png|left|200px]]
==Crystal structure of d(GCGAGAGC): the DNA quadruplex structure split from the octaplex==
<StructureSection load='1v3n' size='340' side='right' caption='[[1v3n]], [[Resolution|resolution]] 1.80&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[1v3n]] is a 2 chain structure. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1V3N OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1V3N FirstGlance]. <br>
</td></tr><tr><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=K:POTASSIUM+ION'>K</scene><br>
<tr><td class="sblockLbl"><b>[[Non-Standard_Residue|NonStd Res:]]</b></td><td class="sblockDat"><scene name='pdbligand=CBR:5-BROMO-2-DEOXY-CYTIDINE-5-MONOPHOSPHATE'>CBR</scene></td></tr>
<tr><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[1v3o|1v3o]], [[1v3p|1v3p]]</td></tr>
<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=1v3n FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1v3n OCA], [http://www.rcsb.org/pdb/explore.do?structureId=1v3n RCSB], [http://www.ebi.ac.uk/pdbsum/1v3n PDBsum]</span></td></tr>
<table>
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Recent genomic analyses revealed many kinds of tandem repeats of specific sequences. Some of them are related to genetic diseases, but their biological functions and structures are still unknown. Two X-ray structures of a short DNA fragment d(gcGA[G]1Agc) show that four base-intercalated duplexes are assembled to form an octaplex at a low K+ concentration, in which the eight G5 residues form a stacked double G-quartet in the central part. At a higher K+ concentration, however, the octaplex is split into just two halves. These structural features suggest a folding process of eight tandem repeats of d(ccGA[G]4Agg), according to a double Greek-key motif. Such a packaging of the repeats could facilitate slippage of a certain sequence during DNA replication, to induce increase or decrease of the repeats.


{{STRUCTURE_1v3n|  PDB=1v3n  |  SCENE=  }}
Crystal structures of a DNA octaplex with I-motif of G-quartets and its splitting into two quadruplexes suggest a folding mechanism of eight tandem repeats.,Kondo J, Adachi W, Umeda S, Sunami T, Takenaka A Nucleic Acids Res. 2004 May 7;32(8):2541-9. Print 2004. PMID:15133122<ref>PMID:15133122</ref>


===Crystal structure of d(GCGAGAGC): the DNA quadruplex structure split from the octaplex===
From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
 
</div>
{{ABSTRACT_PUBMED_15133122}}
== References ==
 
<references/>
==About this Structure==
__TOC__
[[1v3n]] is a 2 chain structure. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1V3N OCA].
</StructureSection>
 
==Reference==
<ref group="xtra">PMID:015133122</ref><references group="xtra"/>
[[Category: Kondo, J.]]
[[Category: Kondo, J.]]
[[Category: Sunami, T.]]
[[Category: Sunami, T.]]
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