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1en8

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[[Image:1en8.gif|left|200px]]
 
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==1 A CRYSTAL STRUCTURES OF B-DNA REVEAL SEQUENCE-SPECIFIC BINDING AND GROOVE-SPECIFIC BENDING OF DNA BY MAGNESIUM AND CALCIUM==
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The line below this paragraph, containing "STRUCTURE_1en8", creates the "Structure Box" on the page.
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<StructureSection load='1en8' size='340' side='right'caption='[[1en8]], [[Resolution|resolution]] 0.98&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'>[[1en8]] is a 1 chain structure. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1EN8 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1EN8 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]] 0.985&#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=CA:CALCIUM+ION'>CA</scene>, <scene name='pdbligand=EOH:ETHANOL'>EOH</scene></td></tr>
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{{STRUCTURE_1en8| PDB=1en8 | 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=1en8 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1en8 OCA], [https://pdbe.org/1en8 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1en8 RCSB], [https://www.ebi.ac.uk/pdbsum/1en8 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1en8 ProSAT]</span></td></tr>
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</table>
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'''1 A CRYSTAL STRUCTURES OF B-DNA REVEAL SEQUENCE-SPECIFIC BINDING AND GROOVE-SPECIFIC BENDING OF DNA BY MAGNESIUM AND CALCIUM'''
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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: Chiu TK]]
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The 1 A resolution X-ray crystal structures of Mg(2+) and Ca(2+) salts of the B-DNA decamers CCAACGTTGG and CCAGCGCTGG reveal sequence-specific binding of Mg(2+) and Ca(2+) to the major and minor grooves of DNA, as well as non-specific binding to backbone phosphate oxygen atoms. Minor groove binding involves H-bond interactions between cross-strand DNA base atoms of adjacent base-pairs and the cations' water ligands. In the major groove the cations' water ligands can interact through H-bonds with O and N atoms from either one base or adjacent bases, and in addition the softer Ca(2+) can form polar covalent bonds bridging adjacent N7 and O6 atoms at GG bases. For reasons outlined earlier, localized monovalent cations are neither expected nor found.Ultra-high atomic resolution gives an unprecedented view of hydration in both grooves of DNA, permits an analysis of individual anisotropic displacement parameters, and reveals up to 22 divalent cations per DNA duplex. Each DNA helix is quite anisotropic, and alternate conformations, with motion in the direction of opening and closing the minor groove, are observed for the sugar-phosphate backbone. Taking into consideration the variability of experimental parameters and crystal packing environments among these four helices, and 24 other Mg(2+) and Ca(2+) bound B-DNA structures, we conclude that sequence-specific and strand-specific binding of Mg(2+) and Ca(2+) to the major groove causes DNA bending by base-roll compression towards the major groove, while sequence-specific binding of Mg(2+) and Ca(2+) in the minor groove has a negligible effect on helix curvature. The minor groove opens and closes to accommodate Mg(2+) and Ca(2+) without the necessity for significant bending of the overall helix.The program Shelxdna was written to facilitate refinement and analysis of X-ray crystal structures by Shelxl-97 and to plot and analyze one or more Curves and Freehelix output files.
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[[Category: Dickerson RE]]
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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=1EN8 OCA].
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==Reference==
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1 A crystal structures of B-DNA reveal sequence-specific binding and groove-specific bending of DNA by magnesium and calcium., Chiu TK, Dickerson RE, J Mol Biol. 2000 Aug 25;301(4):915-45. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/10966796 10966796]
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[[Category: Chiu, T K.]]
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[[Category: Dickerson, R E.]]
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[[Category: B-dna]]
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[[Category: Divalent cation]]
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[[Category: Dna sequence-specific binding]]
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[[Category: Shelxdna]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Fri May 2 15:18:27 2008''
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Current revision

1 A CRYSTAL STRUCTURES OF B-DNA REVEAL SEQUENCE-SPECIFIC BINDING AND GROOVE-SPECIFIC BENDING OF DNA BY MAGNESIUM AND CALCIUM

PDB ID 1en8

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