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<StructureSection load='294d' size='340' side='right'caption='[[294d]], [[Resolution|resolution]] 2.50&Aring;' scene=''>
<StructureSection load='294d' size='340' side='right'caption='[[294d]], [[Resolution|resolution]] 2.50&Aring;' scene=''>
== Structural highlights ==
== Structural highlights ==
<table><tr><td colspan='2'>[[294d]] is a 8 chain structure. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=294D OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=294D FirstGlance]. <br>
<table><tr><td colspan='2'>[[294d]] is a 8 chain structure. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=294D OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=294D 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=294d FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=294d OCA], [http://pdbe.org/294d PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=294d RCSB], [http://www.ebi.ac.uk/pdbsum/294d PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=294d 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=294d FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=294d OCA], [https://pdbe.org/294d PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=294d RCSB], [https://www.ebi.ac.uk/pdbsum/294d PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=294d ProSAT]</span></td></tr>
</table>
</table>
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
The cytosine-rich strand of the Tetrahymena telomere consists of multiple repeats of sequence d(AACCCC). We have solved the crystal structure of the crystalline repeat sequence at 2.5 A resolution. The adenines form two different and previously unknown clusters (A clusters) in orthogonal directions with their counterparts from other strands, each containing a total of eight adenines. The clusters appear to be stable aggregates held together by base stacking and three different base-pairing modes. Two different types of cytosine tetraplexes are found in the crystal. Each four-stranded complex is composed of two intercalated parallel-stranded duplexes pointing in opposite directions, with hemiprotonated cytosine-cytosine (C.C+) base pairs. The outermost C.C+base pairs are from the 5'-end of each strand in one cytosine tetraplex and from the 3'-end of each strand in the other. The A clusters and the cytosine tetraplexes form two alternating stacking patterns, creating continuous base stacking in two perpendicular directions along the x - and z -axes. The adenine clusters could be organizational motifs for macromolecular RNA.
Intercalated cytosine motif and novel adenine clusters in the crystal structure of the Tetrahymena telomere.,Cai L, Chen L, Raghavan S, Ratliff R, Moyzis R, Rich A Nucleic Acids Res. 1998 Oct 15;26(20):4696-705. PMID:9753739<ref>PMID:9753739</ref>
From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 294d" style="background-color:#fffaf0;"></div>
== References ==
<references/>
__TOC__
__TOC__
</StructureSection>
</StructureSection>
[[Category: Large Structures]]
[[Category: Large Structures]]
[[Category: Cai, L]]
[[Category: Cai L]]
[[Category: Chen, L]]
[[Category: Chen L]]
[[Category: Moyzis, R]]
[[Category: Moyzis R]]
[[Category: Raghavan, S]]
[[Category: Raghavan S]]
[[Category: Ratliff, R]]
[[Category: Ratliff R]]
[[Category: Rich, A]]
[[Category: Rich A]]
[[Category: Adenine-cluster]]
[[Category: Base intercalated]]
[[Category: Continuous base stacking]]
[[Category: Dna]]
[[Category: Flipped-out base]]
[[Category: Parallel-stranded tetraplex]]
[[Category: Quadruple helix]]
[[Category: Unusual dna]]
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