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==THE CRYSTAL STRUCTURE OF D(G-G-G-G-C-C-C-C). A MODEL FOR POLY(DG).POLY(DC)==
==THE CRYSTAL STRUCTURE OF D(G-G-G-G-C-C-C-C). A MODEL FOR POLY(DG).POLY(DC)==
<StructureSection load='2ana' size='340' side='right' caption='[[2ana]], [[Resolution|resolution]] 2.50&Aring;' scene=''>
<StructureSection load='2ana' size='340' side='right'caption='[[2ana]], [[Resolution|resolution]] 2.50&Aring;' scene=''>
== Structural highlights ==
== Structural highlights ==
<table><tr><td colspan='2'>[[2ana]] is a 2 chain structure. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2ANA OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=2ANA FirstGlance]. <br>
<table><tr><td colspan='2'>[[2ana]] is a 2 chain structure. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2ANA OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=2ANA FirstGlance]. <br>
</td></tr><tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=2ana FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2ana OCA], [http://pdbe.org/2ana PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=2ana RCSB], [http://www.ebi.ac.uk/pdbsum/2ana PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=2ana ProSAT]</span></td></tr>
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 2.5&#8491;</td></tr>
<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=2ana FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2ana OCA], [https://pdbe.org/2ana PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=2ana RCSB], [https://www.ebi.ac.uk/pdbsum/2ana PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=2ana ProSAT]</span></td></tr>
</table>
</table>
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
The structure of the DNA oligomer d(G-G-G-G-C-C-C-C) has been determined at a resolution of 2.5 A by single-crystal X-ray methods. There are two strands in the asymmetric unit, and these coil about each other to form a right-handed double-helix of the A-type with Watson-Crick hydrogen bonds between base-pairs. The helix has a shallow minor groove and a deep, water-filled major groove; almost all exposed functional groups on the DNA are hydrated, and 106 ordered solvent molecules have been found. The two d(G-G-G-G).d(C-C-C-C) segments in the octamer exhibit similar and uniform structures, but there is a slight discontinuity at the GpC step between them. A recurring feature of the structure is the overlap of adjacent guanine bases in each GpG step, with the five-membered ring of one guanine stacking on the six-membered ring of its neighbour. There is little or no overlap between adjacent cytosine rings. Conformational parameters for these GpG steps are compared with those from other single-crystal X-ray analyses. In general, GpG steps exhibit high slide, low roll and variable twist. Models for poly(dG).poly(dC) were generated by applying a simple rotation and translation to each of the unmodified d(G-G-G-G).d(C-C-C-C) units. Detailed features of these models are shown to be compatible with various assays of poly(dG).poly(dC) in solution, and are useful in understanding the polymorphic behaviour of this sequence under a variety of experimental conditions.
The crystal structure of d(G-G-G-G-C-C-C-C). A model for poly(dG).poly(dC).,McCall M, Brown T, Kennard O J Mol Biol. 1985 Jun 5;183(3):385-96. PMID:4020865<ref>PMID:4020865</ref>
From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 2ana" style="background-color:#fffaf0;"></div>
== References ==
<references/>
__TOC__
__TOC__
</StructureSection>
</StructureSection>
[[Category: Brown, T]]
[[Category: Large Structures]]
[[Category: Kennard, O]]
[[Category: Brown T]]
[[Category: McCall, M]]
[[Category: Kennard O]]
[[Category: A-dna]]
[[Category: McCall M]]
[[Category: Dna]]
[[Category: Double helix]]
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