247d

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[[Image:247d.jpg|left|200px]]<br /><applet load="247d" size="350" color="white" frame="true" align="right" spinBox="true"
 
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caption="247d, resolution 2.800&Aring;" />
 
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'''CRYSTAL STRUCTURES OF AN A-FORM DUPLEX WITH SINGLE-ADENOSINE BULGES AND A CONFORMATIONAL BASIS FOR SITE SPECIFIC RNA SELF-CLEAVAGE'''<br />
 
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==Overview==
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==CRYSTAL STRUCTURES OF AN A-FORM DUPLEX WITH SINGLE-ADENOSINE BULGES AND A CONFORMATIONAL BASIS FOR SITE SPECIFIC RNA SELF-CLEAVAGE==
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BACKGROUND: Bulged nucleotides are common secondary structural motifs in RNA molecules and are often involved in RNA-RNA and RNA-protein interactions. RNA is selectively cleaved at bulge sites (when compared to other sites within stems) in the presence of divalent metal cations. The effects of bulge nucleotides on duplex stability and topology have been extensively investigated, but no detailed X-ray structures of bulge-containing RNA fragments have been available. RESULTS: We have crystallized a self-complementary RNA-DNA chimeric 11-nucleotide sequence containing single-adenosine bulges under two different conditions, giving two distinct crystal forms. In both lattices the adenosines are looped out, leaving the stacking interactions in the duplex virtually unaffected. The bulges cause the duplex to kink in both cases. In one of the structures, the conformation of the bulged nucleotide places its modeled 2'-oxygen in line with the adjacent phosphate on the 3' side, where it is poised for nucleophilic attack. CONCLUSIONS: Single adenosine bulges cause a marked opening of the normally narrow RNA major groove in both crystal structures, rendering the bases more accessible to interacting molecules compared with an intact stem. The geometries around the looped-out adenosines are different in the two crystal forms, indicating that bulges can confer considerable local plasticity on the usually rigid RNA double helix. The results provide a conformational basis for the preferential, metal-assisted self-cleavage of RNA at bulged sites.
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<StructureSection load='247d' size='340' side='right'caption='[[247d]], [[Resolution|resolution]] 2.80&Aring;' scene=''>
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== Structural highlights ==
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==About this Structure==
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<table><tr><td colspan='2'>[[247d]] is a 1 chain structure. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=247D OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=247D FirstGlance]. <br>
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247D is a [http://en.wikipedia.org/wiki/Protein_complex Protein complex] structure of sequences from [http://en.wikipedia.org/wiki/ ]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=247D OCA].
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</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 2.8&#8491;</td></tr>
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<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=247d FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=247d OCA], [https://pdbe.org/247d PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=247d RCSB], [https://www.ebi.ac.uk/pdbsum/247d PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=247d ProSAT]</span></td></tr>
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==Reference==
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</table>
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Crystal structures of an A-form duplex with single-adenosine bulges and a conformational basis for site-specific RNA self-cleavage., Portmann S, Grimm S, Workman C, Usman N, Egli M, Chem Biol. 1996 Mar;3(3):173-84. PMID:[http://ispc.weizmann.ac.il//pmbin/getpm?pmid=8807843 8807843]
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__TOC__
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[[Category: Protein complex]]
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</StructureSection>
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[[Category: Egli, M.]]
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[[Category: Large Structures]]
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[[Category: Grimm, S.]]
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[[Category: Egli M]]
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[[Category: Portmann, S.]]
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[[Category: Grimm S]]
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[[Category: Usman, N.]]
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[[Category: Portmann S]]
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[[Category: Workman, C.]]
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[[Category: Usman N]]
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[[Category: a-dna/rna]]
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[[Category: Workman C]]
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[[Category: bulges]]
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[[Category: double helix]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Feb 21 16:21:40 2008''
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Current revision

CRYSTAL STRUCTURES OF AN A-FORM DUPLEX WITH SINGLE-ADENOSINE BULGES AND A CONFORMATIONAL BASIS FOR SITE SPECIFIC RNA SELF-CLEAVAGE

PDB ID 247d

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