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== Structural highlights ==
== Structural highlights ==
<table><tr><td colspan='2'>[[1i0q]] is a 2 chain structure. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1I0Q OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1I0Q FirstGlance]. <br>
<table><tr><td colspan='2'>[[1i0q]] is a 2 chain structure. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1I0Q OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1I0Q FirstGlance]. <br>
</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=NA:SODIUM+ION'>NA</scene></td></tr>
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 1.3&#8491;</td></tr>
<tr id='NonStdRes'><td class="sblockLbl"><b>[[Non-Standard_Residue|NonStd Res:]]</b></td><td class="sblockDat"><scene name='pdbligand=126:2-O-METHYL-[TRI(OXYETHYL)]-5-METHYL-URIDINE-5-MONOPHOSPHATE'>126</scene></td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=126:2-O-METHYL-[TRI(OXYETHYL)]-5-METHYL-URIDINE-5-MONOPHOSPHATE'>126</scene>, <scene name='pdbligand=NA:SODIUM+ION'>NA</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=1i0q FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1i0q OCA], [https://pdbe.org/1i0q PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1i0q RCSB], [https://www.ebi.ac.uk/pdbsum/1i0q PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1i0q ProSAT]</span></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=1i0q FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1i0q OCA], [https://pdbe.org/1i0q PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1i0q RCSB], [https://www.ebi.ac.uk/pdbsum/1i0q PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1i0q ProSAT]</span></td></tr>
</table>
</table>
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
The observation of light metal ions in nucleic acids crystals is generally a fortuitous event. Sodium ions in particular are notoriously difficult to detect because their X-ray scattering contributions are virtually identical to those of water and Na(+.)O distances are only slightly shorter than strong hydrogen bonds between well-ordered water molecules. We demonstrate here that replacement of Na(+) by K(+), Rb(+) or Cs(+) and precise measurements of anomalous differences in intensities provide a particularly sensitive method for detecting alkali metal ion-binding sites in nucleic acid crystals. Not only can alkali metal ions be readily located in such structures, but the presence of Rb(+) or Cs(+) also allows structure determination by the single wavelength anomalous diffraction technique. Besides allowing identification of high occupancy binding sites, the combination of high resolution and anomalous diffraction data established here can also pinpoint binding sites that feature only partial occupancy. Conversely, high resolution of the data alone does not necessarily allow differentiation between water and partially ordered metal ions, as demonstrated with the crystal structure of a DNA duplex determined to a resolution of 0.6 A.
Detection of alkali metal ions in DNA crystals using state-of-the-art X-ray diffraction experiments.,Tereshko V, Wilds CJ, Minasov G, Prakash TP, Maier MA, Howard A, Wawrzak Z, Manoharan M, Egli M Nucleic Acids Res. 2001 Mar 1;29(5):1208-15. PMID:11222771<ref>PMID:11222771</ref>
From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 1i0q" style="background-color:#fffaf0;"></div>
== References ==
<references/>
__TOC__
__TOC__
</StructureSection>
</StructureSection>
[[Category: Large Structures]]
[[Category: Large Structures]]
[[Category: Egli, M]]
[[Category: Egli M]]
[[Category: Howard, A]]
[[Category: Howard A]]
[[Category: Maier, M A]]
[[Category: Maier MA]]
[[Category: Manoharan, M]]
[[Category: Manoharan M]]
[[Category: Minasov, G]]
[[Category: Minasov G]]
[[Category: Prakash, T P]]
[[Category: Prakash TP]]
[[Category: Tereshko, V]]
[[Category: Tereshko V]]
[[Category: Wawrzak, Z]]
[[Category: Wawrzak Z]]
[[Category: Wilds, C J]]
[[Category: Wilds CJ]]
[[Category: A-form double helix]]
[[Category: Dna]]
[[Category: Modified sugar]]

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