View source for 3mij


==Crystal structure of a telomeric RNA G-quadruplex complexed with an acridine-based ligand.==
<StructureSection load='3mij' size='340' side='right'caption='[[3mij]], [[Resolution|resolution]] 2.60&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[3mij]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3MIJ OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=3MIJ FirstGlance]. <br>
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 2.6&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=K:POTASSIUM+ION'>K</scene>, <scene name='pdbligand=R14:N,N-[ACRIDINE-3,6-DIYLBIS(1H-1,2,3-TRIAZOLE-1,4-DIYLBENZENE-3,1-DIYL)]BIS[3-(DIETHYLAMINO)PROPANAMIDE]'>R14</scene></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=3mij FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3mij OCA], [https://pdbe.org/3mij PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=3mij RCSB], [https://www.ebi.ac.uk/pdbsum/3mij PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=3mij ProSAT]</span></td></tr>
</table>
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Human telomeric DNA is now known to be transcribed into noncoding RNA sequences, termed TERRA. These sequences, which are believed to play roles in the regulation of telomere function, can form higher-order quadruplex structures and may themselves be the target of therapeutic intervention. The crystal structure of a TERRA quadruplex-acridine small-molecule complex at a resolution of 2.60 [Formula: see text], is reported here and contrasts remarkably with the structure of the analogous DNA quadruplex complex. The bimolecular RNA complex has a parallel-stranded topology with propeller-like UUA loops. These loops are held in particular conformations by multiple hydrogen bonds involving the O2' hydroxyl groups of the ribonucleotide sugars and play an active role in binding the acridine molecules to the RNA quadruplex. By contrast, the analogous DNA quadruplex complex has simpler 1:1 acridine binding, with no loop involvement. There are significant loop conformational changes in the RNA quadruplex compared to the native TERRA quadruplex ( Collie , G. W. ; Haider , S. M. ; Neidle , S. ; Parkinson , G. N. Nucleic Acids Res. 2010 , 38, , 5569 - 5580 ), which have implications for the future design of small molecules targeting TERRA quadruplexes, and RNA quadruplexes more generally.

Structural Basis of Telomeric RNA Quadruplex-Acridine Ligand Recognition.,Collie GW, Sparapani S, Parkinson GN, Neidle S J Am Chem Soc. 2011 Feb 3. PMID:21291211<ref>PMID:21291211</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 3mij" style="background-color:#fffaf0;"></div>
== References ==
<references/>
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</StructureSection>
[[Category: Homo sapiens]]
[[Category: Large Structures]]
[[Category: Collie GW]]
[[Category: Neidle S]]
[[Category: Parkinson GN]]