1qp5

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[[Image:1qp5.gif|left|200px]]
 
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==BASE-PAIRING SHIFT IN A DODECAMER CONTAINING A (CA)N TRACT==
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The line below this paragraph, containing "STRUCTURE_1qp5", creates the "Structure Box" on the page.
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<StructureSection load='1qp5' size='340' side='right'caption='[[1qp5]], [[Resolution|resolution]] 2.60&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'>[[1qp5]] is a 2 chain structure. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1QP5 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1QP5 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]] 2.6&#8491;</td></tr>
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<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=MG:MAGNESIUM+ION'>MG</scene></td></tr>
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{{STRUCTURE_1qp5| PDB=1qp5 | SCENE= }}
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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=1qp5 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1qp5 OCA], [https://pdbe.org/1qp5 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1qp5 RCSB], [https://www.ebi.ac.uk/pdbsum/1qp5 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1qp5 ProSAT]</span></td></tr>
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</table>
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'''BASE-PAIRING SHIFT IN A DODECAMER CONTAINING A (CA)N TRACT'''
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__TOC__
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</StructureSection>
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[[Category: Large Structures]]
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==Overview==
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[[Category: Moras D]]
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the crystal packing of the B-DNA dodecamer d(ACCG-GCGCCACA).d(TGTGGCGCCGGT) is characterized by the reciprocal fit of double helices with specific base-backbone interactions in the major groove. Cooling the crystals below -10 degrees C stabilizes a new conformational state with a long-range sequence-dependent one-step shift in the major-groove base pairing. The tilt of the bases leads to the disruption of the Watson-Crick pairing in the major groove and to the formation of interactions with the 5' neighbour of their complement. This alteration propagates along the helical axis over more than half a turn. As a result, the molecular structure is normal when seen from the minor groove side and mismatched in the major groove. Comparison with a parent isomorphous dodecamer structure corresponding to the codon 10-13 of the c-Ha-ras proto-oncogene show that this new structural feature is sequence dependent and clearly favoured by (CA)n tracts. As(CA)n tracts of DNA are involved both in recombination and in transcription, this new recognition pattern should be considered in the analysis of the various processes involving the reading of the genetic information.
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[[Category: Timsit Y]]
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[[Category: Vilbois E]]
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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=1QP5 OCA].
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==Reference==
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Base-pairing shift in the major groove of (CA)n tracts by B-DNA crystal structures., Timsit Y, Vilbois E, Moras D, Nature. 1991 Nov 14;354(6349):167-70. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/1944598 1944598]
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[[Category: Moras, D.]]
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[[Category: Timsit, Y.]]
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[[Category: Vilbois, E.]]
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[[Category: Base pair shift]]
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[[Category: Dna self-fitting]]
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[[Category: Dna-dna interaction]]
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[[Category: Frameshift mutation]]
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[[Category: Microsatellite instability]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 06:32:28 2008''
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BASE-PAIRING SHIFT IN A DODECAMER CONTAINING A (CA)N TRACT

PDB ID 1qp5

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