157d

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(New page: 200px<br /><applet load="157d" size="450" color="white" frame="true" align="right" spinBox="true" caption="157d, resolution 1.800&Aring;" /> '''CRYSTAL AND MOLECUL...)
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[[Image:157d.jpg|left|200px]]<br /><applet load="157d" size="450" color="white" frame="true" align="right" spinBox="true"
 
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caption="157d, resolution 1.800&Aring;" />
 
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'''CRYSTAL AND MOLECULAR STRUCTURE OF R(CGCGAAUUAGCG): AN RNA DUPLEX CONTAINING TWO G(ANTI).A(ANTI) BASE-PAIRS'''<br />
 
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==Overview==
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==CRYSTAL AND MOLECULAR STRUCTURE OF R(CGCGAAUUAGCG): AN RNA DUPLEX CONTAINING TWO G(ANTI).A(ANTI) BASE-PAIRS==
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BACKGROUND: Non-Watson-Crick base pair associations contribute, significantly to the stabilization of RNA tertiary structure. The, conformation adopted by such pairs appears to be a function of both the, sequence and the secondary structure of the RNA molecule. G.A mispairs, adopt G(anti).A(anti) configurations in some circumstances, such as the, ends of helical regions of rRNAs, but in other circumstances probably, adopt an unusual configuration in which the inter-base hydrogen bonds, involve functional groups from other bases. We investigated the structure, of G.A pairs in a synthetic RNA dodecamer, r(CGCGAAUUAGCG), which forms a, duplex containing two such mismatches. RESULTS: The structure of the RNA, duplex was determined by single crystal X-ray diffraction techniques to a, resolution in the range 7.0-1.8A, and found to be an A-type helical, structure with 10 Watson-Crick pairs and two G.A mispairs. The mispairs, adopt the G(anti).A(anti) conformation, held together by two obvious, hydrogen bonds. Unlike analogous base pairs seen in a DNA duplex, they do, not exhibit a high propeller twist and may therefore be further stabilized, by weak, reverse, three-center hydrogen bonds. CONCLUSIONS:, G(anti).A(anti) mispairs are held together by two hydrogen of guanine and, the N6 and N1 of adenine. If the mispairs do not exhibit high propeller, twist they may be further stabilized by inter-base reverse three-centre, hydrogen bonds. These interactions, and other hydrogen bonds seen in our, study, may be important in modelling the structure of RNA molecules and, their interactions with other molecules.
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<StructureSection load='157d' size='340' side='right'caption='[[157d]], [[Resolution|resolution]] 1.80&Aring;' scene=''>
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== Structural highlights ==
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==About this Structure==
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<table><tr><td colspan='2'>[[157d]] is a 2 chain structure. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=157D OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=157D FirstGlance]. <br>
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157D 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://ispc.weizmann.ac.il/oca-bin/ocashort?id=157D 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]] 1.8&#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=157d FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=157d OCA], [https://pdbe.org/157d PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=157d RCSB], [https://www.ebi.ac.uk/pdbsum/157d PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=157d ProSAT]</span></td></tr>
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==Reference==
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</table>
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Crystal and molecular structure of r(CGCGAAUUAGCG): an RNA duplex containing two G(anti).A(anti) base pairs., Leonard GA, McAuley-Hecht KE, Ebel S, Lough DM, Brown T, Hunter WN, Structure. 1994 Jun 15;2(6):483-94. PMID:[http://ispc.weizmann.ac.il//pmbin/getpm?pmid=7922026 7922026]
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__TOC__
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[[Category: Protein complex]]
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</StructureSection>
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[[Category: Brown, T.]]
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[[Category: Large Structures]]
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[[Category: Ebel, S.]]
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[[Category: Brown T]]
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[[Category: Hunter, W.N.]]
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[[Category: Ebel S]]
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[[Category: Leonard, G.A.]]
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[[Category: Hunter WN]]
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[[Category: Lough, D.M.]]
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[[Category: Leonard GA]]
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[[Category: McAuley-Hecht, K.E.]]
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[[Category: Lough DM]]
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[[Category: a-rna]]
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[[Category: McAuley-Hecht KE]]
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[[Category: double helix]]
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[[Category: mismatched]]
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''Page seeded by [http://ispc.weizmann.ac.il/oca OCA ] on Sat Nov 24 21:59:57 2007''
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Current revision

CRYSTAL AND MOLECULAR STRUCTURE OF R(CGCGAAUUAGCG): AN RNA DUPLEX CONTAINING TWO G(ANTI).A(ANTI) BASE-PAIRS

PDB ID 157d

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