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==G-quadruplexes with (4n-1) guanines in the G-tetrad core: formation of a G-triad water complex and implication for small-molecule binding==
==G-quadruplexes with (4n-1) guanines in the G-tetrad core: formation of a G-triad water complex and implication for small-molecule binding==
<StructureSection load='2n60' size='340' side='right'caption='[[2n60]], [[NMR_Ensembles_of_Models | 10 NMR models]]' scene=''>
<StructureSection load='2n60' size='340' side='right'caption='[[2n60]]' scene=''>
== Structural highlights ==
== Structural highlights ==
<table><tr><td colspan='2'>[[2n60]] is a 1 chain structure. Full experimental information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2N60 OCA]. For a <b>guided tour on the structure components</b> use [http://proteopedia.org/fgij/fg.htm?mol=2N60 FirstGlance]. <br>
<table><tr><td colspan='2'>[[2n60]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Synthetic_construct Synthetic construct]. Full experimental information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2N60 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=2N60 FirstGlance]. <br>
</td></tr><tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://proteopedia.org/fgij/fg.htm?mol=2n60 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2n60 OCA], [http://pdbe.org/2n60 PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=2n60 RCSB], [http://www.ebi.ac.uk/pdbsum/2n60 PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=2n60 ProSAT]</span></td></tr>
</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=2n60 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2n60 OCA], [https://pdbe.org/2n60 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=2n60 RCSB], [https://www.ebi.ac.uk/pdbsum/2n60 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=2n60 ProSAT]</span></td></tr>
</table>
</table>
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
G-quadruplexes are non-canonical structures of nucleic acids, in which guanine bases form planar G-tetrads (G.G.G.G) that stack on each other in the core of the structure. G-quadruplexes generally contain multiple times of four (4n) guanines in the core. Here, we study the structure of G-quadruplexes with only (4n - 1) guanines in the core. The solution structure of a DNA sequence containing 11 guanines showed the formation of a parallel G-quadruplex involving two G-tetrads and one G-triad with a vacant site. Molecular dynamics simulation established the formation of a stable G-triad.water complex, where water molecules mimic the position of the missing guanine in the vacant site. The concept of forming G-quadruplexes with missing guanines in the core broadens the current definition of G-quadruplex-forming sequences. The potential ability of such structures to bind different metabolites, including guanine, guanosine and GTP, in the vacant site, could have biological implications in regulatory functions. Formation of this unique binding pocket in the G-triad could be used as a specific target in drug design.
G-quadruplexes with (4n - 1) guanines in the G-tetrad core: formation of a G-triad.water complex and implication for small-molecule binding.,Heddi B, Martin-Pintado N, Serimbetov Z, Kari TM, Phan AT Nucleic Acids Res. 2016 Jan 29;44(2):910-6. doi: 10.1093/nar/gkv1357. Epub 2015, Dec 15. PMID:26673723<ref>PMID:26673723</ref>
From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 2n60" style="background-color:#fffaf0;"></div>
== References ==
<references/>
__TOC__
__TOC__
</StructureSection>
</StructureSection>
[[Category: Large Structures]]
[[Category: Large Structures]]
[[Category: Heddi, B]]
[[Category: Synthetic construct]]
[[Category: Kari, T M]]
[[Category: Heddi B]]
[[Category: Martin-Pintado, N]]
[[Category: Kari TM]]
[[Category: Phan, A T]]
[[Category: Martin-Pintado N]]
[[Category: Serimbetov, Z]]
[[Category: Phan AT]]
[[Category: 11 guanine]]
[[Category: Serimbetov Z]]
[[Category: Dna]]
[[Category: G-quadruplex]]
[[Category: G-triad]]
[[Category: K+ solution]]
[[Category: Vacant site]]
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