5zt2

<table><tr><td colspan='2'>[[5zt2]] is a 1 chain structure. This structure supersedes the now removed PDB entry [http://oca.weizmann.ac.il/oca-bin/send-pdb?obs=1&id=4qno 4qno]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=5ZT2 OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=5ZT2 FirstGlance]. <br>

</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=CO:COBALT+(II)+ION'>CO</scene></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=5zt2 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=5zt2 OCA], [http://pdbe.org/5zt2 PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=5zt2 RCSB], [http://www.ebi.ac.uk/pdbsum/5zt2 PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=5zt2 ProSAT]</span></td></tr>

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== Publication Abstract from PubMed ==

CCG triplet repeats can fold into tetraplex structures, which are associated with the expansion of (CCG)n trinucleotide sequences in certain neurological diseases. These structures are stabilized by intertwining i-motifs. However, the structural basis for tetraplex i-motif formation in CCG triplet repeats remains largely unknown. We report the first crystal structure of a CCG-repeat sequence, which shows that two dT(CCG)3 A strands can associate to form a tetraplex structure with an i-motif core containing four C:C(+) pairs flanked by two G:G homopurine base pairs as a structural motif. The tetraplex core is attached to a short parallel-stranded duplex. Each hairpin itself contains a central CCG loop in which the nucleotides are flipped out and stabilized by stacking interactions. The helical twists between adjacent cytosine residues of this structure in the i-motif core have an average value of 30 degrees , which is greater than those previously reported for i-motif structures.

Structural basis for the identification of an i-motif tetraplex core with a parallel-duplex junction as a structural motif in CCG triplet repeats.,Chen YW, Jhan CR, Neidle S, Hou MH Angew Chem Int Ed Engl. 2014 Sep 26;53(40):10682-6. doi: 10.1002/anie.201405637. , Epub 2014 Aug 19. PMID:25139267<ref>PMID:25139267</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 5zt2" style="background-color:#fffaf0;"></div>

== References ==

<references/>

[[Category: Chen, Y W]]

[[Category: Hou, M H]]

[[Category: Satange, R B]]

[[Category: Wu, P C]]

[[Category: Dna]]

[[Category: Tetraplex structure]]