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| - | [[Image:1evp.gif|left|200px]] | |
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| - | <!--
| + | ==CRYSTAL STRUCTURE OF THE CHIMERICAL DECAMER D(CCACTAGTG)R(G)== |
| - | The line below this paragraph, containing "STRUCTURE_1evp", creates the "Structure Box" on the page.
| + | <StructureSection load='1evp' size='340' side='right'caption='[[1evp]], [[Resolution|resolution]] 1.80Å' scene=''> |
| - | You may change the PDB parameter (which sets the PDB file loaded into the applet)
| + | == Structural highlights == |
| - | or the SCENE parameter (which sets the initial scene displayed when the page is loaded),
| + | <table><tr><td colspan='2'>[[1evp]] is a 2 chain structure. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1EVP OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1EVP FirstGlance]. <br> |
| - | or leave the SCENE parameter empty for the default display.
| + | </td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 1.8Å</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=1evp FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1evp OCA], [https://pdbe.org/1evp PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1evp RCSB], [https://www.ebi.ac.uk/pdbsum/1evp PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1evp ProSAT]</span></td></tr> |
| - | {{STRUCTURE_1evp| PDB=1evp | SCENE= }}
| + | </table> |
| - | | + | __TOC__ |
| - | '''CRYSTAL STRUCTURE OF THE CHIMERICAL DECAMER D(CCACTAGTG)R(G)'''
| + | </StructureSection> |
| - | | + | [[Category: Large Structures]] |
| - | | + | [[Category: Sundaralingam M]] |
| - | ==Overview== | + | [[Category: Wahl MC]] |
| - | The crystal structure of the chimerical decamer d(CCACTAGTG)r(G), bearing a 3'-terminal ribo-guanidine, has been solved and refined at 1.8 A resolution (R-factor 16.6%; free R-factor 22.8%). The decamer crystallizes in the orthorhombic space group P2(1)2(1)2(1) with unit cell constants a = 23.90 A, b = 45.76 A and c = 49.27 A. The structure was solved by molecular replacement using the coordinates of the isomorphous chimera r(GCG)d(TATACGC). The final model contains one duplex and 77 water molecules per asymmetric unit. Surprisingly, all residues adopt a conformation typical for A-form nucleic acids (C3'-endo type sugar pucker) although the all-DNA analog, d(CCACTAGTGG), has been crystallized in the B-form. Comparing circular dichroism spectra of the chimera and the corresponding all-DNA sequence reveals a similar trend of the former molecule to adopt an A-like conformation in solution. The results suggest that the preference of ribonucleotides for the A-form is communicated into the 5'-direction of an oligonucleotide strand, although direct interactions of the 2'-hydroxyl group can only be discerned with nucleotides in the 3'-direction of a C3'-endo puckered ribose. These observations imply that forces like water-mediated contacts, the concerted motions of backbone torsion angles, and stacking preferences, are responsible for such long-range influences. This bi-directional structural communication originating from a ribonucleotide can be expected to contribute to the stability of the A-form within all-RNA duplexes.
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| - | | + | |
| - | ==About this Structure== | + | |
| - | Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1EVP OCA]. | + | |
| - | | + | |
| - | ==Reference== | + | |
| - | B-form to A-form conversion by a 3'-terminal ribose: crystal structure of the chimera d(CCACTAGTG)r(G)., Wahl MC, Sundaralingam M, Nucleic Acids Res. 2000 Nov 1;28(21):4356-63. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/11058136 11058136]
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| - | [[Category: Sundaralingam, M.]]
| + | |
| - | [[Category: Wahl, M C.]] | + | |
| - | [[Category: A-dna]]
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| - | [[Category: B-dna]]
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| - | [[Category: Dna-rna chimera]]
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| - | [[Category: Nucleic acid structure]] | + | |
| - | [[Category: Structural conversion]] | + | |
| - | [[Category: X-ray crystallography]] | + | |
| - | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Fri May 2 15:34:28 2008''
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