View source for 362d


==THE STRUCTURE OF D(TGCGCA)2 AND A COMPARISON TO OTHER Z-DNA HEXAMERS==
<StructureSection load='362d' size='340' side='right'caption='[[362d]], [[Resolution|resolution]] 1.30&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[362d]] is a 2 chain structure. This structure supersedes the now removed PDB entry [http://oca.weizmann.ac.il/oca-bin/send-pdb?obs=1&id=347d 347d]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=362D OCA]. For a <b>guided tour on the structure components</b> use [http://proteopedia.org/fgij/fg.htm?mol=362D FirstGlance]. <br>
</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=NCO:COBALT+HEXAMMINE(III)'>NCO</scene></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=362d FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=362d OCA], [http://pdbe.org/362d PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=362d RCSB], [http://www.ebi.ac.uk/pdbsum/362d PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=362d ProSAT]</span></td></tr>
</table>
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
The X-ray crystal structure of d(TGCGCA)2 has been determined at 120 K to a resolution of 1.3 A. Hexamer duplexes, in the Z-DNA conformation, pack in an arrangement similar to the 'pure spermine form' [Egli et al. (1991). Biochemistry, 30, 11388-11402] but with significantly different cell dimensions. The phosphate backbone exists in two equally populated discrete conformations at one nucleotide step, around phosphate 11. The structure contains two ordered cobalt hexammine molecules which have roles in stabilization of both the Z-DNA conformation of the duplex and in crystal packing. A comparison of d(TGCGCA)2 with other Z-DNA hexamer structures available in the Nucleic Acid Database illustrates the elusive nature of crystal packing. A review of the interactions with the metal cations Na+, Mg2+ and Co3+ reveals a relatively small proportion of phosphate binding and that close contacts between metal ions are common. A prediction of the water structure is compared with the observed pattern in the reported structure.

Structure of d(TGCGCA)2 and a comparison to other DNA hexamers.,Harper A, Brannigan JA, Buck M, Hewitt L, Lewis RJ, Moore MH, Schneider B Acta Crystallogr D Biol Crystallogr. 1998 Nov 1;54(Pt 6 Pt 2):1273-84. PMID:10089504<ref>PMID:10089504</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 362d" style="background-color:#fffaf0;"></div>

==See Also==
*[[Z-DNA|Z-DNA]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Large Structures]]
[[Category: Brannigan, J A]]
[[Category: Buck, M]]
[[Category: Harper, N A]]
[[Category: Lewis, R J]]
[[Category: Moore, M H]]
[[Category: Schneider, B]]
[[Category: Dna]]
[[Category: Double helix]]
[[Category: Z-dna]]