View source for 1x26


==Solution structure of the AA-mismatch DNA complexed with naphthyridine-azaquinolone==
<StructureSection load='1x26' size='340' side='right'caption='[[1x26]]' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[1x26]] is a 2 chain structure. Full experimental information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1X26 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1X26 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='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=NAZ:N~3~-{3-[(7-METHYL-1,8-NAPHTHYRIDIN-2-YL)AMINO]-3-OXOPROPYL}-N~1~-[(7-OXO-7,8-DIHYDRO-1,8-NAPHTHYRIDIN-2-YL)METHYL]-BETA-ALANINAMIDE'>NAZ</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=1x26 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1x26 OCA], [https://pdbe.org/1x26 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1x26 RCSB], [https://www.ebi.ac.uk/pdbsum/1x26 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1x26 ProSAT]</span></td></tr>
</table>
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
DNA trinucleotide repeats, particularly CXG, are common within the human genome. However, expansion of trinucleotide repeats is associated with a number of disorders, including Huntington disease, spinobulbar muscular atrophy and spinocerebellar ataxia. In these cases, the repeat length is known to correlate with decreased age of onset and disease severity. Repeat expansion of (CAG)n, (CTG)n and (CGG)n trinucleotides may be related to the increased stability of alternative DNA hairpin structures consisting of CXG-CXG triads with X-X mismatches. Small-molecule ligands that selectively bound to CAG repeats could provide an important probe for determining repeat length and an important tool for investigating the in vivo repeat extension mechanism. Here we report that napthyridine-azaquinolone (NA, 1) is a ligand for CAG repeats and can be used as a diagnostic tool for determining repeat length. We show by NMR spectroscopy that binding of NA to CAG repeats induces the extrusion of a cytidine nucleotide from the DNA helix.

Small-molecule ligand induces nucleotide flipping in (CAG)n trinucleotide repeats.,Nakatani K, Hagihara S, Goto Y, Kobori A, Hagihara M, Hayashi G, Kyo M, Nomura M, Mishima M, Kojima C Nat Chem Biol. 2005 Jun;1(1):39-43. Epub 2005 May 24. PMID:16407992<ref>PMID:16407992</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 1x26" style="background-color:#fffaf0;"></div>
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Large Structures]]
[[Category: Goto Y]]
[[Category: Hagihara M]]
[[Category: Hagihara S]]
[[Category: Hayashi G]]
[[Category: Kobori A]]
[[Category: Kojima C]]
[[Category: Kyo M]]
[[Category: Mishima M]]
[[Category: Nakatani K]]
[[Category: Nomura M]]