View source for 122d


==DNA HELIX STRUCTURE AND REFINEMENT ALGORITHM: COMPARISON OF MODELS FOR D(CCAGGCM==5==CTGG) DERIVED FROM NUCLSQ, TNT, AND X-PLOR==
<StructureSection load='122d' size='340' side='right'caption='[[122d]], [[Resolution|resolution]] 1.70&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[122d]] is a 2 chain structure. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=122D OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=122D FirstGlance]. <br>
</td></tr><tr id='NonStdRes'><td class="sblockLbl"><b>[[Non-Standard_Residue|NonStd Res:]]</b></td><td class="sblockDat"><scene name='pdbligand=5CM:5-METHYL-2-DEOXY-CYTIDINE-5-MONOPHOSPHATE'>5CM</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=122d FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=122d OCA], [https://pdbe.org/122d PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=122d RCSB], [https://www.ebi.ac.uk/pdbsum/122d PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=122d ProSAT]</span></td></tr>
</table>
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== Publication Abstract from PubMed ==
In an earlier study [Heinemann &amp; Hahn (1992). J. Biol. Chem. 267, 7332-7341], the crystal structure of the double-stranded B-DNA decamer d(CCAGGCm(5)CTGG) was refined with NUCLSQ to R = 17.4% against 3799 2sigma structure amplitudes in the resolution range 8-1.7 A. This structure has now been re-refined against the same diffraction data using either TNT or X-PLOR in order to determine to what extent the resulting DNA conformations would differ and to examine the suitability of these programs for the refinement of oligonucleotide structures. The R value from the NUCLSQ refinement could not be reached with either TNT or X-PLOR, although both programs yield reasonably refined DNA models showing root-mean-square deviations against the NUCLSQ model of the decamer duplex of 0.25 and 0.32 A, respectively. Some derived local structure parameters differ depending on the refinement procedure used. This holds true for several exocyclic torsion angles of the sugar-phosphate backbone, whereas sugar puckers as well as helical and base-pair stacking parameters are only weakly influenced. A subset of 15 solvent sites with low temperature factors is conserved in all three models.

DNA helix structure and refinement algorithm: comparison of models for d(CCAGGCm5CTGG) derived from NUCLSQ, TNT and X-PLOR.,Hahn M, Heinemann U Acta Crystallogr D Biol Crystallogr. 1993 Sep 1;49(Pt 5):468-77. PMID:15299506<ref>PMID:15299506</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 122d" style="background-color:#fffaf0;"></div>
== References ==
<references/>
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</StructureSection>
[[Category: Large Structures]]
[[Category: Hahn, M]]
[[Category: Heinemann, U]]
[[Category: B-dna]]
[[Category: Dna]]
[[Category: Double helix]]
[[Category: Modified]]