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==INTRAMOLECULAR QUADRUPLEX DNA WITH THREE GGGG REPEATS, NMR, PH 6.7, 0.1 M NA+ AND 4 MM (STRAND CONCENTRATION), 5 STRUCTURES==
<StructureSection load='1fqp' size='340' side='right'caption='[[1fqp]]' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[1fqp]] is a 2 chain structure. Full experimental information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1FQP OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1FQP FirstGlance]. <br>
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">Solution NMR</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=1fqp FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1fqp OCA], [https://pdbe.org/1fqp PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1fqp RCSB], [https://www.ebi.ac.uk/pdbsum/1fqp PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1fqp ProSAT]</span></td></tr>
</table>
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== Publication Abstract from PubMed ==
The solution structure of the DNA quadruplex formed by the association of two strands of the DNA oligonucleotide, d(G3T4G3), in NaCl solution has been determined by 1H two-dimensional NMR techniques, full relaxation matrix calculations and restrained molecular dynamics. The refined structure incorporates the sequences 5'-G1sG2AG3AT4AT5AT6AT7AG8sG9AG10A-3' and 5'-G11sG12AG13AT14AT15AT16AT17AG18sG19sG20A-3' (where S and A denote syn and anti, respectively) in a three-quartet, diagonal-looped structure that we [Strahan, G. D., Shafer, R. H. &amp; Keniry, M. A. (1994) Nucleic Acids Res. 22, 5447-5455] and others [Smith, F. W., Lau, F. W. &amp; Feigon, J. (1994) Proc. Natl. Acad. Sci. USA 91, 10546-10550] have described. The loop structure is compact and incorporates many of the features found in duplex hairpin loops including base stacking, intraloop hydrogen bonding and extensive van der Waals' interactions. The first and third loop thymines stack over the outermost G-quartet and are also associated by hydrogen bonding. The second and the fourth loop thymines fold inwards in order to enhance van der Waals' interactions. The unexpected sequential syn-syn deoxyguanosines in the quadruplex stem appear to be a direct consequence of the way DNA oligonucleotides fold and the subsequent search for the most stable loop structure. The implications of loop sequence and length on the structure of quadruplexes are discussed.

Solution structure of the Na+ form of the dimeric guanine quadruplex [d(G3T4G3)]2.,Keniry MA, Strahan GD, Owen EA, Shafer RH Eur J Biochem. 1995 Oct 15;233(2):631-43. PMID:7588810<ref>PMID:7588810</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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<div class="pdbe-citations 1fqp" style="background-color:#fffaf0;"></div>
== References ==
<references/>
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</StructureSection>
[[Category: Large Structures]]
[[Category: Keniry MA]]
[[Category: Owen EA]]
[[Category: Shafer RH]]
[[Category: Strahan GD]]