1r3o

<StructureSection load='1r3o' size='340' side='right' caption='[[1r3o]], [[Resolution|resolution]] 1.90&Aring;' scene=''>

<table><tr><td colspan='2'>[[1r3o]] is a 4 chain structure. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1R3O OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1R3O FirstGlance]. <br>

</td></tr><tr id='NonStdRes'><td class="sblockLbl"><b>[[Non-Standard_Residue|NonStd Res:]]</b></td><td class="sblockDat"><scene name='pdbligand=0C:L-CYTIDINE-5-MONOPHOSPHATE'>0C</scene>, <scene name='pdbligand=0G:L-GUANOSINE-5-MONOPHOSPHATE'>0G</scene>, <scene name='pdbligand=0U:L-URIDINE-5-MONOPHOSPHATE'>0U</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=1r3o FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1r3o OCA], [http://pdbe.org/1r3o PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=1r3o RCSB], [http://www.ebi.ac.uk/pdbsum/1r3o PDBsum]</span></td></tr>

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== Publication Abstract from PubMed ==

Nucleic acid molecules in the mirror image or L-configuration are unknown in nature and are extraordinarily resistant to biological degradation. The identification of functional L-oligonucleotides called Spiegelmers offers a novel approach for drug discovery based on RNA. The sequence r(CUGGGCGG).r(CCGCCUGG) was chosen as a model system for structural analysis of helices in the L-configuration as the structure of the D-form of this sequence has previously been determined in structural studies of 5S RNA domains, in particular domain E of the Thermus flavus 5S rRNA [Perbandt et al. (2001), Acta Cryst. D57, 219-224]. Unexpectedly, the results of crystallization trials showed little similarity between the D- and the L-forms of the duplex in either the crystallization hits or the diffraction performance. The crystal structure of this L-RNA duplex has been determined at 1.9 A resolution with R(work) and R(free) of 23.8 and 28.6%, respectively. The crystals belong to space group R32, with unit-cell parameters a = 45.7, c = 264.6 A. Although there are two molecules in the asymmetric unit rather than one, the structure of the L-form arranges helical pairs in a head-to-tail fashion to form pseudo-continuous infinite helices in the crystal as in the D-form. On the other hand, the wobble-like G.C(+) base pair seen in the D-RNA analogue does not appear in the L-RNA duplex, which forms a regular double-helical structure with typical Watson-Crick base pairing.

First look at RNA in L-configuration.,Vallazza M, Perbandt M, Klussmann S, Rypniewski W, Einspahr HM, Erdmann VA, Betzel Ch Acta Crystallogr D Biol Crystallogr. 2004 Jan;60(Pt 1):1-7. Epub 2003 Dec, 18. PMID:14684885<ref>PMID:14684885</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 1r3o" style="background-color:#fffaf0;"></div>

== References ==

<references/>

[[Category: Betzel, C]]

[[Category: Erdmann, V A]]

[[Category: Klussmann, S]]

[[Category: Perbandt, M]]

[[Category: Rypniewski, W]]

[[Category: Vallazza, M]]

[[Category: Rna]]