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137d

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[[Image:137d.gif|left|200px]]
 
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==A-DNA DECAMER D(GCGGGCCCGC)-ORTHORHOMBIC CRYSTAL FORM==
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The line below this paragraph, containing "STRUCTURE_137d", creates the "Structure Box" on the page.
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<StructureSection load='137d' size='340' side='right'caption='[[137d]], [[Resolution|resolution]] 1.70&Aring;' scene=''>
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You may change the PDB parameter (which sets the PDB file loaded into the applet)
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== Structural highlights ==
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or the SCENE parameter (which sets the initial scene displayed when the page is loaded),
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<table><tr><td colspan='2'>[[137d]] is a 2 chain structure. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=137D OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=137D FirstGlance]. <br>
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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]] 1.7&#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=137d FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=137d OCA], [https://pdbe.org/137d PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=137d RCSB], [https://www.ebi.ac.uk/pdbsum/137d PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=137d ProSAT]</span></td></tr>
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{{STRUCTURE_137d| PDB=137d | SCENE= }}
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</table>
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__TOC__
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'''A-DNA DECAMER D(GCGGGCCCGC)-ORTHORHOMBIC CRYSTAL FORM'''
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</StructureSection>
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[[Category: Large Structures]]
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[[Category: Ramakrishnan B]]
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==Overview==
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[[Category: Sundaralingam M]]
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We have determined the structure of the A-DNA decamer d(GCGGGCCCGC) in two crystal forms, orthorhombic and hexagonal, at 1.7- and 1.8-A resolution, respectively. In the orthorhombic form, the fifth guanine residue has nearly trans-trans conformations for the alpha-gamma backbone torsions, as in the isomorphous orthorhombic structure d(CCCGGCCGGG) [Ramakrishnan, B., &amp; Sundaralingam, M. (1993) J. Mol. Biol. 231, 431-444]. However, in the hexagonal form, the eighth cytosine residue adopts the trans-trans conformations for the backbone alpha-gamma torsions, as in the isomorphous hexagonal structure d(ACCGGCCGGT) [Frederick, C. A., Quigley, G. J., Teng, M.-K., Coll, M., van der Marel, G. A., van Boom, J. H., Rich, A., &amp; Wang, A. H.-J. (1989) Eur. J. Biochem. 181, 295-307]. Even though the average helix and base-pair parameters are nearly the same in the two polymorphous crystal forms having the same sequence, many of the base-dependent local helix parameters are quite different. However, in the isomorphous crystal forms, in spite of the differing base sequences, the local helix and base-pair parameters of the duplexes are nearly the same. This indicates that, in crystals, the local conformation of a DNA structure is affected severely by the crystal packing environment rather than by the base sequence.
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==About this Structure==
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Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=137D OCA].
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==Reference==
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Evidence for crystal environment dominating base sequence effects on DNA conformation: crystal structures of the orthorhombic and hexagonal polymorphs of the A-DNA decamer d(GCGGGCCCGC) and comparison with their isomorphous crystal structures., Ramakrishnan B, Sundaralingam M, Biochemistry. 1993 Oct 26;32(42):11458-68. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/8218212 8218212]
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[[Category: Ramakrishnan, B.]]
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[[Category: Sundaralingam, M.]]
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[[Category: A-dna]]
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[[Category: Double helix]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Fri May 2 09:29:18 2008''
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A-DNA DECAMER D(GCGGGCCCGC)-ORTHORHOMBIC CRYSTAL FORM

PDB ID 137d

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